fix(migrate): restore storage object xattrs lost in the server move

After the netralax.cloud -> netralax.de migration every storage object GET
returned HTTP 500 (ENODATA "The extended attribute does not exist"). Root
cause: the object bytes were copied but Supabase Storage (file backend,
v1.48.26) keeps each object's response metadata in Linux xattrs
(user.supabase.{content-type,cache-control,etag}); the copy did not preserve
them. The old server is gone, but the values survive in storage.objects.metadata,
so this script reconstructs the xattrs from the DB. Verified: public avatar GETs
went 500 -> 200 after running it; all 18 objects (avatars, banner, attachments)
restored, 0 files genuinely missing. Idempotent, touches no object bytes.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.env.release.example

@@ -0,0 +1,24 @@
+# Copy to .env.release (gitignored) and fill in.
+# Consumed by scripts/release.mjs.
+#
+# electron-updater hash-verifies via SHA-512 embedded in latest.yml, so no
+# minisign / Tauri signing key is needed any more — the legacy
+# TAURI_SIGNING_* vars from the Tauri build can be removed once you've
+# stopped publishing Tauri releases to this host.
+
+# Host serving latest.yml + installer artifacts over HTTPS.
+# NOTE: during the .cloud→.de transition the new VPS must ALSO serve the same
+# artifacts under update.netralax.cloud (point its DNS at the new IP) so that
+# already-installed clients — which have update.netralax.cloud baked in — can
+# still pull the release that switches them over to .de.
+UPDATE_HOST=update.netralax.de
+
+# SSH user on UPDATE_HOST with write access to UPDATE_REMOTE_PATH.
+UPDATE_SSH_USER=chatapp-deploy
+
+# Optional: path to the SSH private key. Omit to fall back on ssh-agent or the
+# default id_rsa.
+UPDATE_SSH_KEY=
+
+# Absolute path on the server where windows/ artifacts + latest.json live.
+UPDATE_REMOTE_PATH=/var/www/updates/windows

.github/workflows/release.yml

@@ -1,35 +1,27 @@
-name: Release desktop app
+name: Release desktop app (manual backup)
 
-# Tag a version to trigger a release:
+# Self-hosted updates run from scripts/release.mjs on Dennis's Windows box.
-#   git tag v0.1.0 && git push --tags
+# This workflow is kept as a manual backup — trigger it from the Actions tab
-#
+# if the local build host is unavailable.
-# Produces signed Tauri bundles for macOS (arm + intel), Windows, and Linux,
-# uploads them to a GitHub Release, and publishes `latest.json` for the
-# updater plugin to discover.
 
 on:
-  push:
+  workflow_dispatch:
-    tags:
+    inputs:
-      - "v*"
+      tag:
+        description: "Tag to build (e.g. v0.10.2) — must already exist"
+        required: true
 
 permissions:
   contents: write
 
 jobs:
   build:
-    strategy:
+    runs-on: windows-latest
-      fail-fast: false
-      matrix:
-        include:
-          - platform: macos-14 # universal binary covers both Intel + Apple Silicon
-            args: "--target universal-apple-darwin --bundles app,updater"
-          - platform: windows-latest
-            args: ""
-
-    runs-on: ${{ matrix.platform }}
 
     steps:
       - uses: actions/checkout@v4
+        with:
+          ref: ${{ inputs.tag }}
 
       - name: Install pnpm
         uses: pnpm/action-setup@v4
@@ -42,8 +34,6 @@ jobs:
 
       - name: Setup Rust
         uses: dtolnay/rust-toolchain@stable
-        with:
-          targets: ${{ matrix.platform == 'macos-14' && 'aarch64-apple-darwin,x86_64-apple-darwin' || '' }}
 
       - name: Install JS deps
         run: pnpm install --frozen-lockfile
@@ -54,18 +44,16 @@ jobs:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           TAURI_SIGNING_PRIVATE_KEY: ${{ secrets.TAURI_SIGNING_PRIVATE_KEY }}
           TAURI_SIGNING_PRIVATE_KEY_PASSWORD: ${{ secrets.TAURI_SIGNING_PRIVATE_KEY_PASSWORD }}
-          # Client-side env vars baked into the bundle — paste your prod values
-          # into the repo's Actions → Secrets so releases point at prod.
           VITE_SUPABASE_URL: ${{ secrets.VITE_SUPABASE_URL }}
           VITE_SUPABASE_ANON_KEY: ${{ secrets.VITE_SUPABASE_ANON_KEY }}
           VITE_AUTH_REDIRECT_URL: ${{ secrets.VITE_AUTH_REDIRECT_URL }}
           VITE_LIVEKIT_URL: ${{ secrets.VITE_LIVEKIT_URL }}
         with:
           projectPath: apps/desktop
-          tagName: ${{ github.ref_name }}
+          tagName: ${{ inputs.tag }}
-          releaseName: "ChatApp ${{ github.ref_name }}"
+          releaseName: "ChatApp ${{ inputs.tag }}"
-          releaseBody: "See the assets below to download this version."
+          releaseBody: "Manual build — copy .nsis.zip/.sig/latest.json to the update host."
           releaseDraft: true
           prerelease: false
           tauriScript: pnpm exec tauri
-          args: ${{ matrix.args }}
+          args: "--bundles nsis"

.gitignore

@@ -15,7 +15,9 @@ out/
 .env
 .env.local
 .env.*.local
+.env.release
 !.env.example
+!.env.release.example
 
 # Expo
 .expo/
@@ -27,14 +29,13 @@ web-build/
 *.key
 *.mobileprovision
 
-# Tauri updater signing key (private — NEVER commit)
+# Electron desktop build artifacts
-.tauri-updater.key
+apps/desktop/out/
-# .tauri-updater.key.pub is public, may be committed
+apps/desktop/release/
 
-# Tauri
+# Bundle visualizer reports
-apps/desktop/src-tauri/target/
+apps/desktop/stats.html
-apps/desktop/src-tauri/gen/
+apps/desktop/stats.json
-apps/desktop/src-tauri/WixTools/
 
 # Logs
 *.log
@@ -56,6 +57,9 @@ Thumbs.db
 *.swp
 *.swo
 
+# Claude Code per-project local settings
+.claude/
+
 # Coverage
 coverage/
 *.lcov

.npmrc

@@ -0,0 +1,11 @@
+# React Native / Expo expects a flat (npm/yarn-style) node_modules layout
+# where ALL transitive deps are reachable from any package. pnpm's strict
+# isolation breaks that — Metro hits a fresh missing-module error for every
+# transitive dep (invariant, nullthrows, @babel/runtime/helpers/*, ...).
+#
+# shamefully-hoist=true hoists everything to the workspace-root node_modules
+# (like npm/yarn) so all transitive deps are reachable via standard Node
+# resolution. This is the official Expo monorepo workaround and is the
+# only sustainable answer for Expo + RN + pnpm. Desktop (Electron+Vite)
+# bundles via Vite, so the flatter layout doesn't affect it.
+shamefully-hoist=true

apps/desktop/electron.vite.config.ts

@@ -0,0 +1,116 @@
+// electron-vite config. Three targets:
+//   - main: the Electron main-process entry (electron/main.ts)
+//   - preload: the contextBridge script (electron/preload.ts)
+//   - renderer: the existing React app at apps/desktop/ (unchanged root)
+//
+// Manual chunks + optimizeDeps config is ported from the pre-migration
+// vite.config.ts so LiveKit/libsodium/supabase/react vendor bundles keep
+// caching independently across app updates.
+
+import react from '@vitejs/plugin-react';
+import { defineConfig, externalizeDepsPlugin } from 'electron-vite';
+import path from 'node:path';
+import { visualizer } from 'rollup-plugin-visualizer';
+
+const ANALYZE = process.env.ANALYZE === 'true';
+
+const rendererAliases = {
+  '@': path.resolve(__dirname, './src'),
+  '@shared': path.resolve(__dirname, '../../packages/shared/src'),
+  '@db-types': path.resolve(__dirname, '../../packages/db-types/src'),
+  '@ui-web': path.resolve(__dirname, '../../packages/ui-web/src'),
+};
+
+export default defineConfig({
+  main: {
+    plugins: [externalizeDepsPlugin()],
+    build: {
+      outDir: 'out/main',
+      rollupOptions: {
+        input: path.resolve(__dirname, 'electron/main.ts'),
+      },
+    },
+  },
+  preload: {
+    plugins: [externalizeDepsPlugin()],
+    build: {
+      outDir: 'out/preload',
+      rollupOptions: {
+        input: path.resolve(__dirname, 'electron/preload.ts'),
+      },
+    },
+  },
+  renderer: {
+    root: '.',
+    // file:// loading from inside app.asar can't resolve root-absolute
+    // asset URLs (`/assets/...`) — they hit the OS root instead of the
+    // bundle. Relative base produces `./assets/...` which works in both
+    // dev (served from /) and packaged builds.
+    base: './',
+    // Visualizer plugins are gated behind ANALYZE=true so the production
+    // build never pays the analysis cost. Re-enable with:
+    //   ANALYZE=true pnpm --filter @chat-app/desktop build
+    // which writes apps/desktop/stats.html (treemap) + stats.json (raw).
+    plugins: [
+      react(),
+      ...(ANALYZE
+        ? [
+            visualizer({
+              filename: 'stats.html',
+              template: 'treemap',
+              gzipSize: true,
+              brotliSize: true,
+              open: false,
+            }),
+            visualizer({
+              filename: 'stats.json',
+              template: 'raw-data',
+              gzipSize: true,
+              brotliSize: true,
+            }),
+          ]
+        : []),
+    ],
+    resolve: {
+      alias: rendererAliases,
+    },
+    optimizeDeps: {
+      // libsodium-wrappers-sumo (and the compact variant) ship broken
+      // "import" conditions in package exports — the ESM bundle
+      // references a sibling ./libsodium.mjs that isn't in the
+      // published artefact. Force esbuild to pick the "require"
+      // condition so the self-contained CJS build is used.
+      include: ['libsodium-wrappers-sumo'],
+      esbuildOptions: {
+        conditions: ['require', 'node', 'default'],
+      },
+    },
+    build: {
+      outDir: 'out/renderer',
+      rollupOptions: {
+        input: path.resolve(__dirname, 'index.html'),
+        output: {
+          manualChunks: (id: string): string | undefined => {
+            if (id.includes('node_modules/livekit-client')) return 'vendor-livekit';
+            if (id.includes('node_modules/libsodium-wrappers-sumo'))
+              return 'vendor-sodium';
+            if (id.includes('node_modules/@supabase')) return 'vendor-supabase';
+            if (
+              id.includes('node_modules/react-router') ||
+              id.includes('node_modules/react-dom') ||
+              id.includes('node_modules/react/')
+            ) {
+              return 'vendor-react';
+            }
+            return undefined;
+          },
+        },
+      },
+    },
+    server: {
+      port: 1420,
+      strictPort: true,
+    },
+    clearScreen: false,
+  },
+});

apps/desktop/electron/ipc-types.ts

@@ -0,0 +1,290 @@
+// Single source of truth for the Electron IPC surface. Main process
+// registers handlers keyed by the CHANNEL constants; preload exposes a
+// typed `window.electronAPI` that mirrors the same shape. Renderer
+// imports the type-only declarations via a d.ts published from preload.
+//
+// Rule: anything that the Rust side of Tauri used to do goes through
+// here. If a call is not in this file it should not exist in the
+// renderer.
+
+export const CHANNELS = {
+  // Screen-share — replaces Rust screen_sources + browser getDisplayMedia
+  // coordination. Video still flows through Chromium's native pipeline
+  // (LiveKit JS SDK calls getDisplayMedia); we only feed it source ids.
+  SCREEN_GET_SOURCES: 'screen:get-sources',
+  SCREEN_GET_THUMBNAIL: 'screen:get-thumbnail',
+  /** Renderer-driven source selection: the picker modal calls this with
+   *  the chosen sourceId BEFORE invoking getDisplayMedia. The main-process
+   *  display-media handler then routes that source into the LiveKit track
+   *  (instead of silently granting request.frame). Pass null to clear. */
+  SCREEN_SET_PENDING_SOURCE: 'screen:set-pending-source',
+
+  // System audio loopback — Implementation is renderer-driven under Electron.
+  // Main provides the screen source id (AUDIO_LOOPBACK_RESOLVE_SOURCE); the
+  // renderer then calls navigator.mediaDevices.getUserMedia with a
+  // chromeMediaSourceId constraint to obtain the loopback MediaStream
+  // directly. The legacy START/STOP channels are kept as named constants
+  // for now to avoid breaking type imports but have no handlers — see
+  // the renderer's lib/screenAudio.ts for the new flow.
+  AUDIO_LOOPBACK_RESOLVE_SOURCE: 'audio:loopback:resolve-source',
+
+  // Native WASAPI process-loopback path (Windows only). Implemented by
+  // the @chatapp/audio-loopback-native napi-rs addon; main owns the
+  // session and forwards PCM chunks to the renderer via the CHUNK event.
+  // Captures every render session on the box *except* our own PID tree,
+  // so peers in a video call don't hear themselves echoed back when the
+  // sharer ticks "include system audio". Falls back to the renderer-
+  // driven getUserMedia path on macOS/Linux or when the addon isn't
+  // available (dev builds without `pnpm build:native`, packaged builds
+  // missing the .node binary, etc.).
+  AUDIO_LOOPBACK_START: 'audio:loopback:start',
+  /** Window-share variant: capture audio of ONLY the picked window's
+   *  process tree (INCLUDE_TARGET_PROCESS_TREE). Renderer derives the
+   *  HWND from desktopCapturer's `window:<HWND>:0` source ids. */
+  AUDIO_LOOPBACK_START_FOR_WINDOW: 'audio:loopback:start-for-window',
+  AUDIO_LOOPBACK_STOP: 'audio:loopback:stop',
+  AUDIO_LOOPBACK_CHUNK: 'audio:loopback:chunk',
+
+  // Global hotkeys — replaces @tauri-apps/plugin-global-shortcut. Main
+  // owns the registration; renderer listens to `shortcut:fired` events
+  // for press and `shortcut:released` for PTT-style release.
+  SHORTCUT_REGISTER: 'shortcut:register',
+  SHORTCUT_UNREGISTER: 'shortcut:unregister',
+  SHORTCUT_IS_REGISTERED: 'shortcut:is-registered',
+  SHORTCUT_EVT_FIRED: 'shortcut:fired',
+  SHORTCUT_EVT_RELEASED: 'shortcut:released',
+
+  // OS notifications — replaces @tauri-apps/plugin-notification. Permission
+  // is always granted on desktop Electron; we keep the surface symmetric
+  // with the Tauri version so renderer code doesn't need to branch.
+  NOTIFY_SHOW: 'notify:show',
+  NOTIFY_PERMISSION: 'notify:permission',
+
+  // Tray badge — replaces tauri emit('tray-unread-update'). Main owns the
+  // Tray instance and overlays an unread count; renderer just pushes
+  // the number.
+  TRAY_UNREAD: 'tray:unread',
+
+  // Secure store — replaces plugin-stronghold + custom file vault. Uses
+  // Electron safeStorage (DPAPI/Keychain/libsecret) to seal per-user
+  // blobs on disk. `secure-store:open` establishes a per-user handle;
+  // subsequent calls use the stringified handle.
+  SECURE_STORE_OPEN: 'secure-store:open',
+  SECURE_STORE_GET: 'secure-store:get',
+  SECURE_STORE_SET: 'secure-store:set',
+  SECURE_STORE_REMOVE: 'secure-store:remove',
+  SECURE_STORE_CLOSE: 'secure-store:close',
+
+  // Filesystem (scoped to app local data dir) — replaces plugin-fs.
+  // All paths are relative to appLocalDataDir; main rejects traversal.
+  FS_READ: 'fs:read',
+  FS_WRITE: 'fs:write',
+  FS_EXISTS: 'fs:exists',
+  FS_MKDIR: 'fs:mkdir',
+  FS_RENAME: 'fs:rename',
+  FS_REMOVE: 'fs:remove',
+  FS_APP_LOCAL_DATA_DIR: 'fs:app-local-data-dir',
+
+  // SQLite — replaces plugin-sql. The renderer gets a handle per DB file.
+  SQL_LOAD: 'sql:load',
+  SQL_EXECUTE: 'sql:execute',
+  SQL_SELECT: 'sql:select',
+  SQL_CLOSE: 'sql:close',
+
+  // Auto-updater — replaces plugin-updater. electron-updater feed.
+  UPDATER_CHECK: 'updater:check',
+  UPDATER_DOWNLOAD_INSTALL: 'updater:download-install',
+  UPDATER_EVT_PROGRESS: 'updater:progress',
+
+  // Autostart — replaces @tauri-apps/plugin-autostart. Uses Electron's
+  // built-in app.setLoginItemSettings() to manage OS login items (Windows
+  // registry Run key, macOS LaunchAgent, Linux .desktop entry).
+  AUTOSTART_IS_ENABLED: 'autostart:is-enabled',
+  AUTOSTART_SET: 'autostart:set',
+
+  // Window fullscreen — replaces Tauri's `appWindow.setFullscreen(...)`.
+  // Used by the call cinema mode to flip the host BrowserWindow into real
+  // OS fullscreen so the Windows taskbar / macOS menubar gets covered.
+  WINDOW_SET_FULLSCREEN: 'window:set-fullscreen',
+
+  // Content-protection toggle. Enables/disables OS-level screenshot/screen-
+  // recording block (WDA_MONITOR on Windows, NSWindowSharingNone on macOS)
+  // while a view-once image is being revealed. No-op on Linux X11.
+  WINDOW_SET_CONTENT_PROTECTION: 'window:set-content-protection',
+
+  // Wipe-on-close — main process pushes this to the renderer right before
+  // exiting if the user has enabled the Settings → Sicherheit toggle. The
+  // renderer clears its sensitive caches (memoryWipe.ts) and acks via
+  // `app:wipe-before-quit:done`; main quits after the ack (or a 2s safety
+  // timeout, whichever comes first).
+  /** Main → renderer: about to quit. Renderer wipes, then resolves. */
+  APP_WIPE_BEFORE_QUIT: 'app:wipe-before-quit',
+
+  // OS hostname — returns the machine hostname via Node's `os.hostname()`.
+  // Used by AuthContext on first launch to populate the `devices` row with
+  // a human-readable default device name. Returns null on failure.
+  APP_HOSTNAME: 'app:hostname',
+} as const;
+
+// ---- Screen sources ------------------------------------------------------
+
+export interface ScreenSource {
+  /** Opaque source id. Feed unchanged into getDisplayMedia via the
+   *  chromeMediaSourceId constraint when we want Chromium to capture it. */
+  id: string;
+  name: string;
+  kind: 'screen' | 'window';
+  /** Display index for monitors (0-based). null for windows. */
+  displayId: number | null;
+  /** Pre-fetched thumbnail (data URL). Cheap to get from desktopCapturer
+   *  so we return it inline with the listing — avoids a second round-trip
+   *  per source. */
+  thumbnailDataUrl: string | null;
+  /** App icon for windows (data URL); null when unavailable. */
+  iconDataUrl: string | null;
+}
+
+// ---- Audio loopback ------------------------------------------------------
+
+export interface AudioFrame {
+  captureId: number;
+  sampleRate: number;
+  channels: number;
+  /** Base64 of interleaved f32 LE stereo. Matches the old Tauri
+   *  payload shape so the existing AudioWorklet doesn't change. */
+  samplesBase64: string;
+}
+
+/** Payload shape of `AUDIO_LOOPBACK_CHUNK` events delivered from main
+ *  to the renderer. `samples` is a Float32Array of interleaved f32
+ *  stereo PCM at 48kHz — Electron's structured-clone marshals
+ *  TypedArrays directly, so no base64 hop is needed (unlike the legacy
+ *  Tauri channel). */
+export interface AudioLoopbackChunk {
+  captureId: number;
+  samples: Float32Array;
+}
+
+/** Result of `AUDIO_LOOPBACK_START`. */
+export interface AudioLoopbackStartResult {
+  captureId: number;
+}
+
+// ---- Shortcuts -----------------------------------------------------------
+
+export type ShortcutKind = 'press' | 'ptt';
+
+export interface ShortcutRegisterArgs {
+  /** Accelerator in Electron syntax (e.g. `CommandOrControl+Shift+M`,
+   *  or a bare key code like `F13`). PTT uses a single raw key. */
+  accelerator: string;
+  /** Opaque id the renderer picked. Used in `shortcut:fired` events and
+   *  for unregister. Scoping to a logical id (not the accelerator)
+   *  means the same key can be re-bound without double-register. */
+  id: string;
+  kind: ShortcutKind;
+}
+
+export interface ShortcutEvent {
+  id: string;
+  /** Monotonic timestamp (ms since epoch) — useful for PTT to detect
+   *  held-key repeats at the OS level. */
+  ts: number;
+}
+
+// ---- Notifications -------------------------------------------------------
+
+export interface NotifyArgs {
+  title: string;
+  body: string;
+  /** Silent = no system sound. Renderer already owns its own ringtone
+   *  layer, so most notifications are silent. */
+  silent?: boolean;
+}
+
+// ---- Secure store --------------------------------------------------------
+
+export interface SecureStoreOpenArgs {
+  userId: string;
+}
+
+export interface SecureStoreHandle {
+  handle: string;
+  /** True if the platform's safeStorage is available (encrypted). False
+   *  means the store falls back to plaintext-on-disk — the renderer
+   *  should warn the user and avoid storing long-lived secrets. */
+  encrypted: boolean;
+}
+
+// ---- Filesystem ----------------------------------------------------------
+
+export type FsPath = string;
+
+export interface FsWriteArgs {
+  path: FsPath;
+  /** Base64 of raw bytes. JSON IPC can't carry binary cleanly. */
+  dataBase64: string;
+}
+
+export interface FsRenameArgs {
+  from: FsPath;
+  to: FsPath;
+}
+
+// ---- SQL -----------------------------------------------------------------
+
+export interface SqlLoadArgs {
+  /** DB filename (resolved under appLocalDataDir). Tauri's plugin-sql
+   *  calls these `sqlite:<name>`; we strip the prefix on the main side. */
+  name: string;
+}
+
+export interface SqlExecuteArgs {
+  handle: string;
+  query: string;
+  bindings?: unknown[];
+}
+
+export interface SqlExecuteResult {
+  rowsAffected: number;
+  lastInsertId: number | null;
+}
+
+export interface SqlSelectArgs {
+  handle: string;
+  query: string;
+  bindings?: unknown[];
+}
+
+export type SqlSelectResult = Record<string, unknown>[];
+
+// ---- Updater -------------------------------------------------------------
+
+export interface UpdateInfo {
+  version: string;
+  releaseNotes: string | null;
+}
+
+export interface UpdateCheckResult {
+  available: boolean;
+  info: UpdateInfo | null;
+}
+
+export interface UpdateProgress {
+  percent: number;
+  transferred: number;
+  total: number;
+}
+
+// ---- Window content protection -------------------------------------------
+
+export interface WindowSetContentProtectionArgs {
+  enabled: boolean;
+}
+
+// ---- Runtime marker ------------------------------------------------------
+
+/** Value exposed on `window.electronAPI.platform`. Used by the renderer
+ *  to keep the existing `isTauriRuntime()`-style branches but pointed at
+ *  the new runtime. */
+export const ELECTRON_RUNTIME_MARKER = 'electron-chatapp-v1' as const;

apps/desktop/electron/main.ts

@@ -0,0 +1,319 @@
+// Electron entry point. Creates the single BrowserWindow, wires all IPC
+// module registrars, and keeps a single running instance (second launch
+// focuses the existing window instead of opening a new one).
+//
+// Loads the renderer from the Vite dev server in dev (port 1420, matches
+// the old Tauri devUrl so nothing in the renderer code needs to change)
+// and from the built dist in packaged mode.
+
+import { app, BrowserWindow, desktopCapturer, ipcMain, Menu, session } from 'electron';
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+
+import { CHANNELS } from './ipc-types';
+import { register as registerAudioLoopback } from './modules/audio-loopback';
+import { register as registerAppHostname } from './modules/app-hostname';
+import { register as registerAutostart } from './modules/autostart';
+import { register as registerFsScoped } from './modules/fs-scoped';
+import { register as registerNotifications } from './modules/notifications';
+import { register as registerScreenAudio } from './modules/screen-audio';
+import {
+  consumePendingShareSourceId,
+  register as registerScreenSources,
+} from './modules/screen-sources';
+import { register as registerSecureStore } from './modules/secure-store';
+import { register as registerShortcuts } from './modules/shortcuts';
+import { register as registerSql } from './modules/sql';
+import { register as registerTray } from './modules/tray';
+import { register as registerUpdater } from './modules/updater';
+import { register as registerWindowContentProtection } from './modules/window-content-protection';
+import { register as registerWindowFullscreen } from './modules/window-fullscreen';
+import { attach as attachWindowState, loadState } from './window-state';
+
+// __dirname in an ESM main-process bundle resolves to the out/main dir
+// after electron-vite builds. Use a safe helper that works in both CJS
+// (electron-vite main target defaults to CJS) and ESM contexts.
+const __filenameSafe =
+  typeof __filename === 'string' ? __filename : fileURLToPath(import.meta.url);
+const __dirnameSafe = path.dirname(__filenameSafe);
+
+const DEV_URL = 'http://localhost:1420';
+const WINDOW_STATE_FILE = 'window-state.json';
+
+// Pin userData FIRST — before any other Electron call that might cache a
+// productName-derived path. The 0.17.0 release saw users get logged out
+// after upgrading from 0.16.x: the most likely culprit was an internal
+// path resolution kicking off the moment `setName('Netralax')` ran, so
+// 0.17.1 swaps the order so the explicit override wins regardless of
+// what setName triggers internally. The literal 'ChatApp' here is the
+// pre-rename product folder — installed users' SQLite, secrets, sounds,
+// IndexedDB all live there and we never want to leave them stranded by
+// a future rebrand.
+app.setPath('userData', path.join(app.getPath('appData'), 'ChatApp'));
+
+// App branding. productName in package.json drives the packaged exe name
+// (Netralax.exe) and electron-builder installer title. setName + the
+// AppUserModelId cover the live process: window title fallback, Windows
+// taskbar grouping, notification source attribution.
+app.setName('Netralax');
+if (process.platform === 'win32') {
+  app.setAppUserModelId('cloud.netralax.desktop');
+}
+
+// Run dev side-by-side with the installed packaged build by isolating the
+// renderer profile / secret-store / SQLite / IndexedDB / localStorage in
+// a separate userData dir. Without this both share `%APPDATA%\ChatApp`,
+// the single-instance lock fires, and `pnpm dev` exits immediately while
+// the installed prod app holds the lock. Must run BEFORE the lock check
+// below + before any other module reads `app.getPath('userData')`.
+if (!app.isPackaged) {
+  app.setPath('userData', app.getPath('userData') + '-Dev');
+}
+
+// Startup diagnostics — the 0.17.0 logout regression was hard to debug
+// because we had no record of the actual resolved paths. With this log
+// any future user can paste their main-process output and we can tell
+// at a glance whether userData ended up where we intended.
+console.log(
+  '[main] resolved paths',
+  JSON.stringify({
+    appName: app.getName(),
+    appData: app.getPath('appData'),
+    userData: app.getPath('userData'),
+    isPackaged: app.isPackaged,
+    platform: process.platform,
+  }),
+);
+
+let mainWindow: BrowserWindow | null = null;
+
+function resolvePreloadPath(): string {
+  // electron-vite names the preload bundle after the entry filename, so
+  // electron/preload.ts → out/preload/preload.mjs. ESM preload works in
+  // modern Electron when sandbox: false (which we have — preload needs
+  // Node APIs for libsodium init etc.). The previous `index.cjs` lookup
+  // was a stale leftover that silently never loaded — every IPC call
+  // (secret store, autostart, native notifications, screen sources,
+  // pending-share-source) returned undefined and any .x access threw.
+  return path.join(__dirnameSafe, '..', 'preload', 'preload.mjs');
+}
+
+function resolveRendererIndex(): string {
+  return path.join(__dirnameSafe, '..', 'renderer', 'index.html');
+}
+
+function resolveIconPath(): string {
+  const packaged = path.join(process.resourcesPath || '', 'icon.ico');
+  const dev = path.join(app.getAppPath(), 'resources', 'icon.ico');
+  return app.isPackaged ? packaged : dev;
+}
+
+async function createWindow(): Promise<BrowserWindow> {
+  const state = await loadState(WINDOW_STATE_FILE);
+
+  const win = new BrowserWindow({
+    title: app.isPackaged ? 'Netralax' : 'Netralax (Dev)',
+    width: state.width,
+    height: state.height,
+    ...(state.x !== undefined ? { x: state.x } : {}),
+    ...(state.y !== undefined ? { y: state.y } : {}),
+    minWidth: 800,
+    minHeight: 600,
+    resizable: true,
+    icon: resolveIconPath(),
+    show: false,
+    // Discord-style: no menu bar at all (no File/Edit/View/Window/Help).
+    // Belt: autoHideMenuBar hides it visually; suspenders: the global
+    // Menu.setApplicationMenu(null) below removes it entirely so Alt
+    // can't reveal it either.
+    autoHideMenuBar: true,
+    webPreferences: {
+      contextIsolation: true,
+      nodeIntegration: false,
+      // sandbox: false — preload needs Node APIs (libsodium init etc.)
+      sandbox: false,
+      preload: resolvePreloadPath(),
+      // Strip DevTools from release builds. Disables openDevTools(),
+      // F12, Ctrl+Shift+I, and the right-click Inspect entry for end
+      // users. Packaged = release; unpackaged = `electron-vite dev`,
+      // where we still want the inspector for local debugging.
+      devTools: !app.isPackaged,
+    },
+  });
+
+  if (state.maximized) win.maximize();
+
+  win.once('ready-to-show', () => win.show());
+
+  attachWindowState(win, WINDOW_STATE_FILE);
+
+  if (!app.isPackaged) {
+    // Auto-open DevTools in dev — the menu bar is stripped (Discord-style)
+    // so F12 / Ctrl+Shift+I have no chord; opening detached gives a
+    // separate inspector window for easy debugging.
+    win.webContents.openDevTools({ mode: 'detach' });
+    // Forward renderer console messages to the main-process stdout so
+    // errors during local dev are visible in the terminal too (helps when
+    // the inspector isn't focused).
+    win.webContents.on('console-message', (_event, level, message, line, sourceId) => {
+      const tag = level === 3 ? 'error' : level === 2 ? 'warn' : level === 1 ? 'log' : 'info';
+      console.log('[renderer ' + tag + ']', message, '(' + sourceId + ':' + line + ')');
+    });
+    await win.loadURL(DEV_URL);
+  } else {
+    await win.loadFile(resolveRendererIndex());
+  }
+
+  win.on('closed', () => {
+    if (mainWindow === win) mainWindow = null;
+  });
+
+  return win;
+}
+
+function configureDisplayMediaHandler(): void {
+  // Our custom picker runs in the renderer; when LiveKit (or anything
+  // else) calls navigator.mediaDevices.getDisplayMedia with a specific
+  // chromeMediaSourceId constraint, Chromium defers to the handler we
+  // install here.
+  //
+  // Two paths:
+  //  1. Discord-style picker case — the renderer set a pending source id
+  //     via SCREEN_SET_PENDING_SOURCE before calling getDisplayMedia. We
+  //     resolve that id back to a desktopCapturer Source and pass it as
+  //     the video grant. This is what makes the user's tile choice
+  //     actually take effect.
+  //  2. Fallback — no pending id (e.g. a stray getDisplayMedia from
+  //     another code path). Grant whatever the renderer's constraint
+  //     selected by passing the frame back, matching the legacy v0.11.x
+  //     behavior so we don't break anything off the picker code path.
+  //
+  // Audio: 'loopback' captures all system audio. We tried
+  // 'loopbackWithMute' (which excludes this app's own audio output from
+  // the capture) but it ALSO mutes the renderer's audio playback
+  // locally — so the user couldn't hear remote peers during a share
+  // and the stream had no audio either when the only thing playing was
+  // the muted call audio. There is no clean Electron equivalent of
+  // Tauri's EXCLUDE_TARGET_PROCESS_TREE that affects only the capture
+  // and not local playback. Trade-off chosen here: keep local audio
+  // working ('loopback'), let the user opt into the JS-level auto-duck
+  // (`screenShareSettings.duckRemoteAudioWhileSharing`) when they
+  // actually need the echo prevention. Default: off.
+  // https://www.electronjs.org/docs/latest/api/session#sessetdisplaymediarequesthandlerhandler-opts
+  session.defaultSession.setDisplayMediaRequestHandler(
+    (request, callback) => {
+      const pendingId = consumePendingShareSourceId();
+      if (pendingId) {
+        void desktopCapturer
+          .getSources({ types: ['screen', 'window'] })
+          .then((sources) => {
+            const source = sources.find((s) => s.id === pendingId);
+            if (source) {
+              callback({ video: source, audio: 'loopback' });
+            } else {
+              // Source vanished between picker confirm and grant (window
+              // closed, monitor unplugged). Fall back to the frame grant
+              // so getDisplayMedia doesn't hang the renderer.
+              callback({
+                video: request.frame as unknown as Electron.WebFrameMain,
+                audio: 'loopback',
+              });
+            }
+          })
+          .catch(() => {
+            callback({
+              video: request.frame as unknown as Electron.WebFrameMain,
+              audio: 'loopback',
+            });
+          });
+        return;
+      }
+      callback({
+        video: request.frame as unknown as Electron.WebFrameMain,
+        audio: 'loopback',
+      });
+    },
+    { useSystemPicker: false },
+  );
+}
+
+// Single-instance lock — second launch focuses existing window instead
+// of spawning a duplicate process.
+const gotLock = app.requestSingleInstanceLock();
+if (!gotLock) {
+  app.quit();
+} else {
+  app.on('second-instance', () => {
+    if (!mainWindow) return;
+    if (mainWindow.isMinimized()) mainWindow.restore();
+    mainWindow.show();
+    mainWindow.focus();
+  });
+
+  void app.whenReady().then(async () => {
+    // Strip the default application menu globally — we don't ship any
+    // File/Edit/View/Window/Help entries (Discord-style chrome). Must run
+    // BEFORE the first BrowserWindow is created; setting it later causes
+    // the menu to flash for a frame on Windows.
+    Menu.setApplicationMenu(null);
+    configureDisplayMediaHandler();
+    mainWindow = await createWindow();
+
+    // Stateless registrars first.
+    registerScreenSources();
+    registerScreenAudio();
+    registerNotifications();
+    registerSecureStore();
+    registerFsScoped();
+    registerSql();
+    registerAutostart();
+    registerAppHostname();
+
+    // Window-dependent registrars — only call once mainWindow exists so
+    // event emitters have somewhere to send.
+    registerShortcuts(mainWindow);
+    registerTray(mainWindow);
+    registerUpdater(mainWindow);
+    registerWindowFullscreen(mainWindow);
+    registerWindowContentProtection(mainWindow);
+    registerAudioLoopback(mainWindow);
+  });
+
+  // Wipe-on-close: when the user enables it in Settings, the renderer is given
+  // a chance to clear all sensitive caches before the app process exits. If
+  // the renderer doesn't ack within 2 seconds we force-quit anyway — better
+  // to lose the wipe than to hang the app shutdown.
+  //
+  // Note: there's a separate `before-quit` listener in modules/tray.ts that
+  // tears down the Tray instance. Electron fires both; the tray listener is
+  // synchronous and doesn't touch event.preventDefault, so it doesn't fight
+  // our deferred-quit dance here. The `wipeRequested` flag guards re-entry
+  // when our own `app.quit()` below fires `before-quit` a second time.
+  let wipeRequested = false;
+  app.on('before-quit', (event) => {
+    if (wipeRequested) return;
+    if (!mainWindow || mainWindow.isDestroyed()) return;
+    wipeRequested = true;
+    event.preventDefault();
+
+    mainWindow.webContents.send(CHANNELS.APP_WIPE_BEFORE_QUIT);
+    const done = new Promise<void>((resolve) => {
+      ipcMain.once(CHANNELS.APP_WIPE_BEFORE_QUIT + ':done', () => resolve());
+    });
+    void Promise.race([done, new Promise<void>((r) => setTimeout(r, 2000))]).finally(() => {
+      app.quit();
+    });
+  });
+
+  app.on('window-all-closed', () => {
+    if (process.platform !== 'darwin') app.quit();
+  });
+
+  app.on('activate', () => {
+    if (!mainWindow) {
+      void createWindow().then((w) => {
+        mainWindow = w;
+      });
+    }
+  });
+}

apps/desktop/electron/modules/app-hostname.ts

@@ -0,0 +1,21 @@
+// app:hostname adapter — returns the OS hostname via Node's `os.hostname()`.
+// The renderer has no Node access (contextIsolation is ON), so it must ask
+// main for this value. Used by AuthContext on first launch to populate the
+// `devices` row with a human-readable default device name.
+
+import os from 'node:os';
+
+import { ipcMain } from 'electron';
+
+import { CHANNELS } from '../ipc-types';
+
+export function register(): void {
+  ipcMain.handle(CHANNELS.APP_HOSTNAME, (): string | null => {
+    try {
+      const h = os.hostname();
+      return typeof h === 'string' && h.length > 0 ? h : null;
+    } catch {
+      return null;
+    }
+  });
+}

apps/desktop/electron/modules/audio-loopback.ts

@@ -0,0 +1,213 @@
+// Native WASAPI process-loopback bridge. Wraps the
+// @chatapp/audio-loopback-native napi-rs addon and forwards PCM chunks
+// to the renderer over IPC.
+//
+// Why the addon over Chromium's built-in 'loopback' source: the OS
+// process-loopback API supports EXCLUDE_TARGET_PROCESS_TREE, which lets
+// us capture every render session *except* our own PID tree. That keeps
+// LiveKit's call playback out of the outgoing share so peers don't hear
+// themselves echoed back. Chromium's 'loopback' has no such filter.
+//
+// Windows-only. The addon's start_capture call rejects on macOS/Linux
+// with a clear error string and the renderer falls through to the
+// existing Chromium getUserMedia path (lib/screenAudio.ts).
+
+import { app, BrowserWindow, ipcMain } from 'electron';
+import { createRequire } from 'node:module';
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+
+import {
+  CHANNELS,
+  type AudioLoopbackChunk,
+  type AudioLoopbackStartResult,
+} from '../ipc-types';
+
+interface NativeAudioLoopback {
+  startCapture: (callback: (samples: Float32Array) => void) => number;
+  /** INCLUDE_TARGET_PROCESS_TREE variant — capture only `pid`'s tree.
+   *  Used for window-shares so we get just the picked app's audio. */
+  startCaptureForPid?: (
+    pid: number,
+    callback: (samples: Float32Array) => void,
+  ) => number;
+  /** Look up the owning process id of a top-level window handle. */
+  resolveWindowPid?: (hwnd: number) => number;
+  stopCapture: (captureId: number) => void;
+}
+
+// __dirname in an ESM main bundle resolves to out/main after
+// electron-vite builds. We need a CJS-style require to load the native
+// addon — `import` would trigger ESM resolution which doesn't handle
+// .node files cleanly across electron-vite's transform.
+const __filenameSafe =
+  typeof __filename === 'string' ? __filename : fileURLToPath(import.meta.url);
+const __dirnameSafe = path.dirname(__filenameSafe);
+const requireCjs = createRequire(__filenameSafe);
+
+let cachedAddon: NativeAudioLoopback | null | undefined;
+
+function resolveAddon(): NativeAudioLoopback | null {
+  if (cachedAddon !== undefined) return cachedAddon;
+
+  // Production: electron-builder copies the .node into
+  // resources/native/audio-loopback.node (see extraResources in
+  // package.json).
+  // Dev: napi build emits the binary alongside the addon's package.json
+  // at apps/desktop/native/audio-loopback/audio-loopback.<triple>.node,
+  // and writes an index.js shim that auto-selects the right triple.
+  // Loading the shim works in both layouts when the binary sits
+  // adjacent to it; for the packaged single-file layout we require the
+  // .node directly.
+  const candidates: string[] = [];
+  if (app.isPackaged && process.resourcesPath) {
+    candidates.push(path.join(process.resourcesPath, 'native', 'audio-loopback.node'));
+  }
+  // Dev workspace layout — main bundle lives at out/main/main.js,
+  // addon lives at native/audio-loopback/. Walk up two levels from the
+  // bundle dir (out/main → out → apps/desktop) and into native/.
+  candidates.push(
+    path.join(__dirnameSafe, '..', '..', 'native', 'audio-loopback', 'index.js'),
+    // Direct .node fallback in case the JS shim is missing (e.g. user
+    // ran `cargo build` manually instead of `napi build`).
+    path.join(
+      __dirnameSafe,
+      '..',
+      '..',
+      'native',
+      'audio-loopback',
+      `audio-loopback.${process.platform}-${process.arch}-msvc.node`,
+    ),
+  );
+
+  for (const candidate of candidates) {
+    try {
+      const mod = requireCjs(candidate) as NativeAudioLoopback;
+      if (
+        typeof mod.startCapture === 'function' &&
+        typeof mod.stopCapture === 'function'
+      ) {
+        cachedAddon = mod;
+        return mod;
+      }
+    } catch {
+      /* try next candidate */
+    }
+  }
+
+  cachedAddon = null;
+  return null;
+}
+
+/** Track active capture ids per BrowserWindow so we can tear them down
+ *  if the renderer is destroyed mid-capture (renderer crash, window
+ *  close during share). Without this the WASAPI thread would leak. */
+const activeCaptures = new Map<number, Set<number>>();
+
+function registerWindowCleanup(win: BrowserWindow, addon: NativeAudioLoopback): void {
+  const wcId = win.webContents.id;
+  if (activeCaptures.has(wcId)) return;
+  activeCaptures.set(wcId, new Set());
+  const cleanup = (): void => {
+    const ids = activeCaptures.get(wcId);
+    if (!ids) return;
+    for (const id of ids) {
+      try {
+        addon.stopCapture(id);
+      } catch {
+        /* best effort */
+      }
+    }
+    activeCaptures.delete(wcId);
+  };
+  win.webContents.once('destroyed', cleanup);
+  win.once('closed', cleanup);
+}
+
+export function register(mainWindow: BrowserWindow): void {
+  ipcMain.handle(
+    CHANNELS.AUDIO_LOOPBACK_START,
+    async (event): Promise<AudioLoopbackStartResult> => {
+      const addon = resolveAddon();
+      if (!addon) {
+        throw new Error('audio-loopback native addon unavailable on this platform');
+      }
+      const wc = event.sender;
+      // captureId is assigned synchronously by addon.startCapture below,
+      // but the chunk callback needs to reference it — we forward-declare
+      // via a closure-shared holder. The first chunk can only fire after
+      // startCapture returns (the worker thread spawn happens inside it).
+      let assignedId = 0;
+      const cb = makeChunkCallback(wc, () => assignedId);
+      assignedId = addon.startCapture(cb);
+      registerWindowCleanup(mainWindow, addon);
+      const set = activeCaptures.get(mainWindow.webContents.id);
+      if (set) set.add(assignedId);
+      return { captureId: assignedId };
+    },
+  );
+
+  ipcMain.handle(
+    CHANNELS.AUDIO_LOOPBACK_START_FOR_WINDOW,
+    async (
+      event,
+      args: { hwnd: number },
+    ): Promise<AudioLoopbackStartResult> => {
+      const addon = resolveAddon();
+      if (!addon) {
+        throw new Error('audio-loopback native addon unavailable on this platform');
+      }
+      if (!addon.startCaptureForPid || !addon.resolveWindowPid) {
+        throw new Error(
+          'audio-loopback native addon is too old: missing startCaptureForPid / resolveWindowPid (rebuild with `pnpm build:native`)',
+        );
+      }
+      if (!args || typeof args.hwnd !== 'number' || !Number.isFinite(args.hwnd)) {
+        throw new Error('AUDIO_LOOPBACK_START_FOR_WINDOW: hwnd must be a finite number');
+      }
+      const pid = addon.resolveWindowPid(args.hwnd);
+      const wc = event.sender;
+      let assignedId = 0;
+      const cb = makeChunkCallback(wc, () => assignedId);
+      assignedId = addon.startCaptureForPid(pid, cb);
+      registerWindowCleanup(mainWindow, addon);
+      const set = activeCaptures.get(mainWindow.webContents.id);
+      if (set) set.add(assignedId);
+      return { captureId: assignedId };
+    },
+  );
+
+  ipcMain.handle(
+    CHANNELS.AUDIO_LOOPBACK_STOP,
+    async (_event, captureId: number): Promise<void> => {
+      const addon = resolveAddon();
+      if (!addon) return;
+      try {
+        addon.stopCapture(captureId);
+      } finally {
+        const set = activeCaptures.get(mainWindow.webContents.id);
+        if (set) set.delete(captureId);
+      }
+    },
+  );
+}
+
+/** Shared chunk-forwarding callback. Both start variants produce the
+ *  same wire format (interleaved f32 stereo @ 48kHz) so the renderer
+ *  doesn't need to know which start path was used — the captureId
+ *  routes the chunks. */
+function makeChunkCallback(
+  wc: Electron.WebContents,
+  getCaptureId: () => number,
+): (samples: Float32Array) => void {
+  return (samples: Float32Array): void => {
+    // The addon delivers each chunk on its WASAPI capture thread —
+    // marshal to the renderer's webContents from the main loop. If the
+    // webContents has been destroyed (window closed during a share)
+    // silently drop; the cleanup hook will stop the capture.
+    if (wc.isDestroyed()) return;
+    const captureId = getCaptureId();
+    const payload: AudioLoopbackChunk = { captureId, samples };
+    wc.send(CHANNELS.AUDIO_LOOPBACK_CHUNK, payload);
+  };
+}

apps/desktop/electron/modules/autostart.ts

@@ -0,0 +1,29 @@
+// Autostart adapter — replaces Tauri's `tauri-plugin-autostart`. Uses
+// Electron's built-in `app.setLoginItemSettings()` / `app.getLoginItemSettings()`,
+// which manages the OS login-items mechanism on Windows (HKCU registry
+// Run key), macOS (LaunchAgent), and Linux (.desktop entry).
+
+import { app, ipcMain } from 'electron';
+
+import { CHANNELS } from '../ipc-types';
+
+export function register(): void {
+  ipcMain.handle(CHANNELS.AUTOSTART_IS_ENABLED, () => {
+    try {
+      const settings = app.getLoginItemSettings();
+      return settings.openAtLogin;
+    } catch (err: unknown) {
+      console.warn('autostart get failed', err);
+      return false;
+    }
+  });
+
+  ipcMain.handle(CHANNELS.AUTOSTART_SET, (_evt, enabled: boolean) => {
+    try {
+      app.setLoginItemSettings({ openAtLogin: !!enabled });
+    } catch (err: unknown) {
+      console.warn('autostart set failed', err);
+      throw err;
+    }
+  });
+}

apps/desktop/electron/modules/fs-scoped.ts

@@ -0,0 +1,81 @@
+// Scoped filesystem. Every renderer-supplied path is resolved under
+// `app.getPath('userData')`. Post-normalisation we re-check the resolved
+// absolute path is still contained in the root; anything that breaks out
+// (via .., symlink, absolute path) is rejected. Binary payloads are
+// base64 on the wire because JSON IPC can't carry raw bytes cleanly.
+
+import { app, ipcMain } from 'electron';
+import { promises as fs } from 'node:fs';
+import path from 'node:path';
+
+import { CHANNELS, type FsPath, type FsRenameArgs, type FsWriteArgs } from '../ipc-types';
+
+function rootDir(): string {
+  return app.getPath('userData');
+}
+
+function resolveScoped(rel: FsPath): string {
+  const root = rootDir();
+  if (path.isAbsolute(rel)) {
+    throw new Error('fs-scoped: absolute path rejected');
+  }
+  const normalised = path.normalize(rel);
+  if (normalised.split(/[\\/]/).includes('..')) {
+    throw new Error('fs-scoped: path traversal rejected');
+  }
+  const abs = path.resolve(root, normalised);
+  const withSep = root.endsWith(path.sep) ? root : root + path.sep;
+  if (abs !== root && !abs.startsWith(withSep)) {
+    throw new Error('fs-scoped: escaped scope');
+  }
+  return abs;
+}
+
+export function register(): void {
+  ipcMain.handle(CHANNELS.FS_APP_LOCAL_DATA_DIR, async (): Promise<string> => rootDir());
+
+  ipcMain.handle(CHANNELS.FS_READ, async (_evt, rel: FsPath): Promise<string | null> => {
+    const abs = resolveScoped(rel);
+    try {
+      const buf = await fs.readFile(abs);
+      return buf.toString('base64');
+    } catch (err: unknown) {
+      if ((err as NodeJS.ErrnoException).code === 'ENOENT') return null;
+      throw err;
+    }
+  });
+
+  ipcMain.handle(CHANNELS.FS_WRITE, async (_evt, args: FsWriteArgs): Promise<void> => {
+    const abs = resolveScoped(args.path);
+    await fs.mkdir(path.dirname(abs), { recursive: true });
+    const buf = Buffer.from(args.dataBase64, 'base64');
+    await fs.writeFile(abs, buf);
+  });
+
+  ipcMain.handle(CHANNELS.FS_EXISTS, async (_evt, rel: FsPath): Promise<boolean> => {
+    const abs = resolveScoped(rel);
+    try {
+      await fs.access(abs);
+      return true;
+    } catch {
+      return false;
+    }
+  });
+
+  ipcMain.handle(CHANNELS.FS_MKDIR, async (_evt, rel: FsPath): Promise<void> => {
+    const abs = resolveScoped(rel);
+    await fs.mkdir(abs, { recursive: true });
+  });
+
+  ipcMain.handle(CHANNELS.FS_RENAME, async (_evt, args: FsRenameArgs): Promise<void> => {
+    const from = resolveScoped(args.from);
+    const to = resolveScoped(args.to);
+    await fs.mkdir(path.dirname(to), { recursive: true });
+    await fs.rename(from, to);
+  });
+
+  ipcMain.handle(CHANNELS.FS_REMOVE, async (_evt, rel: FsPath): Promise<void> => {
+    const abs = resolveScoped(rel);
+    await fs.rm(abs, { recursive: true, force: true });
+  });
+}

apps/desktop/electron/modules/notifications.ts

@@ -0,0 +1,26 @@
+// OS notifications. Electron's Notification API doesn't have a separate
+// permission prompt on desktop — permission is implicit and always
+// granted — so `notify:permission` is a compatibility shim that keeps
+// the renderer's existing plugin-notification call-sites working
+// without branching.
+
+import { ipcMain, Notification } from 'electron';
+
+import { CHANNELS, type NotifyArgs } from '../ipc-types';
+
+export function register(): void {
+  ipcMain.handle(CHANNELS.NOTIFY_SHOW, async (_evt, args: NotifyArgs): Promise<void> => {
+    if (!Notification.isSupported()) return;
+    const n = new Notification({
+      title: args.title,
+      body: args.body,
+      silent: args.silent ?? true,
+    });
+    n.show();
+  });
+
+  ipcMain.handle(
+    CHANNELS.NOTIFY_PERMISSION,
+    async (): Promise<'granted' | 'denied' | 'default'> => 'granted',
+  );
+}

apps/desktop/electron/modules/screen-audio.ts

@@ -0,0 +1,38 @@
+// System-audio loopback — renderer-driven. Chromium's
+// `chromeMediaSource: 'desktop'` constraint on getUserMedia accepts a
+// source id and returns a MediaStream that contains the OS mixer output.
+// Main's only job is to resolve which source id the renderer should feed
+// to getUserMedia (typically the primary screen). See the display-media
+// handler in main.ts which grants the request automatically.
+
+import { desktopCapturer, ipcMain } from 'electron';
+
+import { CHANNELS } from '../ipc-types';
+
+export interface ResolveLoopbackSourceResult {
+  sourceId: string;
+}
+
+export function register(): void {
+  ipcMain.handle(
+    CHANNELS.AUDIO_LOOPBACK_RESOLVE_SOURCE,
+    async (): Promise<ResolveLoopbackSourceResult | null> => {
+      // Enumerate only screens; windows don't expose audio loopback on
+      // Windows and there's no meaningful "system audio" tied to a
+      // single window anyway. Primary screen is the first entry — the
+      // id is stable across calls as long as the display config doesn't
+      // change mid-session.
+      const sources = await desktopCapturer.getSources({
+        types: ['screen'],
+        fetchWindowIcons: false,
+      });
+      const first = sources[0];
+      if (!first) return null;
+      return { sourceId: first.id };
+    },
+  );
+
+  // The legacy start/stop channels are left unregistered on purpose —
+  // their constants still exist in ipc-types.ts for backwards compatible
+  // import paths, but there is no corresponding handler.
+}

apps/desktop/electron/modules/screen-sources.ts

@@ -0,0 +1,96 @@
+// Screen / window source enumeration + on-demand high-res thumbnail fetch.
+// The picker in the renderer calls `SCREEN_GET_SOURCES` once to populate
+// the grid (thumbnails come back inline as data URLs from desktopCapturer,
+// so no second round-trip is needed for the initial paint). When the user
+// hovers a tile we can optionally refresh the thumb at a higher resolution
+// via `SCREEN_GET_THUMBNAIL` — same API but a single id and 640x360 size.
+
+import { desktopCapturer, ipcMain } from 'electron';
+
+import { CHANNELS, type ScreenSource } from '../ipc-types';
+
+// Renderer-driven pending source: the picker modal sets this BEFORE calling
+// getDisplayMedia so our display-media handler can route the chosen source
+// to LiveKit. Stored module-level (single capture in flight at a time —
+// the renderer enforces this since only one picker can be open). Cleared
+// on consume or on explicit null-set (cancel/error path).
+let pendingShareSourceId: string | null = null;
+
+/** Read-and-clear: returns the pending id and resets it to null in one
+ *  step so the main-process display-media handler can't accidentally apply
+ *  the same id twice (e.g. if a stray getDisplayMedia call fires while
+ *  the picker is closed). */
+export function consumePendingShareSourceId(): string | null {
+  const id = pendingShareSourceId;
+  pendingShareSourceId = null;
+  return id;
+}
+
+/** Non-destructive read for callers that just want to know if a pending
+ *  selection exists. */
+export function getPendingShareSourceId(): string | null {
+  return pendingShareSourceId;
+}
+
+function parseDisplayId(raw: string): number | null {
+  // desktopCapturer ids for screens look like "screen:<display-id>:0". We
+  // index monitors 0-based in the UI so reduce the opaque id to a small
+  // integer per primary-display order. For windows there is no display
+  // association, return null.
+  if (!raw.startsWith('screen:')) return null;
+  const parts = raw.split(':');
+  const n = Number(parts[1]);
+  return Number.isFinite(n) ? n : null;
+}
+
+async function enumerate(thumbWidth: number, thumbHeight: number): Promise<ScreenSource[]> {
+  const sources = await desktopCapturer.getSources({
+    types: ['screen', 'window'],
+    thumbnailSize: { width: thumbWidth, height: thumbHeight },
+    fetchWindowIcons: true,
+  });
+  return sources.map((src): ScreenSource => {
+    const kind: 'screen' | 'window' = src.id.startsWith('screen:') ? 'screen' : 'window';
+    const thumbnailDataUrl =
+      src.thumbnail && !src.thumbnail.isEmpty() ? src.thumbnail.toDataURL() : null;
+    const iconDataUrl =
+      src.appIcon && !src.appIcon.isEmpty() ? src.appIcon.toDataURL() : null;
+    return {
+      id: src.id,
+      name: src.name,
+      kind,
+      displayId: kind === 'screen' ? parseDisplayId(src.id) : null,
+      thumbnailDataUrl,
+      iconDataUrl,
+    };
+  });
+}
+
+export function register(): void {
+  ipcMain.handle(CHANNELS.SCREEN_GET_SOURCES, async (): Promise<ScreenSource[]> => {
+    return enumerate(320, 180);
+  });
+
+  ipcMain.handle(
+    CHANNELS.SCREEN_GET_THUMBNAIL,
+    async (_evt, sourceId: string): Promise<string | null> => {
+      // Re-enumerate — desktopCapturer has no "fetch one by id" API. Done
+      // at 640x360 so the detail view looks crisp without paying the full
+      // enumeration cost more than once per hover-debounce.
+      const list = await enumerate(640, 360);
+      const found = list.find((s) => s.id === sourceId);
+      return found?.thumbnailDataUrl ?? null;
+    },
+  );
+
+  ipcMain.handle(
+    CHANNELS.SCREEN_SET_PENDING_SOURCE,
+    (_evt, sourceId: string | null): void => {
+      // Renderer signals the chosen source id (or null to clear on cancel/
+      // error). Stored until the next getDisplayMedia request comes in via
+      // the display-media handler, which calls consumePendingShareSourceId
+      // to read-and-clear it.
+      pendingShareSourceId = sourceId;
+    },
+  );
+}

apps/desktop/electron/modules/secure-store.ts

@@ -0,0 +1,191 @@
+// Per-user secure key/value store. Replaces Tauri's plugin-stronghold +
+// custom file vault with Electron's safeStorage (DPAPI on Windows,
+// Keychain on macOS, libsecret on Linux). Encryption is at the file
+// level — the whole entries map is a single encrypted blob — so there's
+// no per-set ciphertext rotation to track.
+//
+// Pre-encrypt JSON: {version:1, entries: { <key>: <utf8-string-value> }}.
+// When safeStorage is unavailable we degrade to a `.plaintext` JSON file
+// and flag `encrypted: false` back to the renderer so the renderer can
+// warn the user and avoid long-lived secrets.
+
+import { app, ipcMain, safeStorage } from 'electron';
+import { createHash } from 'node:crypto';
+import { promises as fs } from 'node:fs';
+import path from 'node:path';
+
+import {
+  CHANNELS,
+  type SecureStoreHandle,
+  type SecureStoreOpenArgs,
+} from '../ipc-types';
+
+interface HandleState {
+  filePath: string;
+  encrypted: boolean;
+  entries: Map<string, string>;
+  saveTimer: NodeJS.Timeout | null;
+}
+
+const handles = new Map<string, HandleState>();
+
+function hashUserId(userId: string): string {
+  return createHash('sha256').update(userId).digest('hex').slice(0, 16);
+}
+
+function filePathFor(userId: string, encrypted: boolean): string {
+  const suffix = hashUserId(userId);
+  const ext = encrypted ? 'bin' : 'plaintext';
+  return path.join(app.getPath('userData'), `chatapp-secure-${suffix}.${ext}`);
+}
+
+async function loadState(filePath: string, encrypted: boolean): Promise<Map<string, string>> {
+  // Read step. Distinguish "no file yet" (genuinely new user — empty Map
+  // is correct) from "file exists but unreadable" (corruption / DPAPI
+  // breakage — we MUST NOT let the next write overwrite those bytes,
+  // because the original ciphertext is the only path back to the user's
+  // device keys if a future build can fix the read path).
+  let rawBuf: Buffer | null = null;
+  let rawStr: string | null = null;
+  try {
+    if (encrypted) {
+      rawBuf = await fs.readFile(filePath);
+    } else {
+      rawStr = await fs.readFile(filePath, 'utf8');
+    }
+  } catch (err: unknown) {
+    const code = (err as NodeJS.ErrnoException | null)?.code;
+    if (code === 'ENOENT') return new Map();
+    console.warn('[secure-store] read failed (non-ENOENT)', filePath, err);
+    // For non-ENOENT read failures (EACCES, EBUSY, …) don't quarantine —
+    // the file might be transiently locked. Empty map + future writes
+    // will attempt to overwrite, matching the pre-0.17.1 behaviour for
+    // these rarer cases.
+    return new Map();
+  }
+
+  // Parse / decrypt step.
+  try {
+    if (encrypted && rawBuf) {
+      const json = safeStorage.decryptString(rawBuf);
+      const parsed = JSON.parse(json) as { version?: number; entries?: Record<string, string> };
+      return new Map(Object.entries(parsed.entries ?? {}));
+    }
+    if (rawStr) {
+      const parsed = JSON.parse(rawStr) as { version?: number; entries?: Record<string, string> };
+      return new Map(Object.entries(parsed.entries ?? {}));
+    }
+    return new Map();
+  } catch (err: unknown) {
+    // CRITICAL: file existed but we couldn't decrypt or parse it. In the
+    // pre-0.17.1 build we silently started fresh — the next set() then
+    // scheduledSave() over-wrote the original ciphertext, destroying the
+    // user's device keys forever. Now we rename the original to
+    // `<file>.broken-<iso-ts>` BEFORE returning the empty map so the next
+    // write goes to a new file and the original bytes survive for
+    // forensics or a future decrypt-recovery path.
+    const ts = new Date().toISOString().replace(/[:.]/g, '-');
+    const brokenPath = `${filePath}.broken-${ts}`;
+    try {
+      await fs.rename(filePath, brokenPath);
+      console.error(
+        `[secure-store] DECRYPT/PARSE FAILED for ${filePath} — preserved original at ${brokenPath}. Original error:`,
+        err,
+      );
+    } catch (renameErr: unknown) {
+      // Even rename failed — fall back to the old behaviour (silent empty
+      // map) but log loudly so it's visible in the main-process output.
+      console.error(
+        '[secure-store] rename of broken file failed; original may be overwritten on next save',
+        renameErr,
+        'original decrypt error:',
+        err,
+      );
+    }
+    return new Map();
+  }
+}
+
+async function writeStateNow(state: HandleState): Promise<void> {
+  const obj: Record<string, string> = {};
+  for (const [k, v] of state.entries) obj[k] = v;
+  const serialised = JSON.stringify({ version: 1, entries: obj });
+  await fs.mkdir(path.dirname(state.filePath), { recursive: true });
+  if (state.encrypted) {
+    const buf = safeStorage.encryptString(serialised);
+    await fs.writeFile(state.filePath, buf);
+  } else {
+    await fs.writeFile(state.filePath, serialised, 'utf8');
+  }
+}
+
+function scheduleSave(state: HandleState): void {
+  if (state.saveTimer) clearTimeout(state.saveTimer);
+  state.saveTimer = setTimeout(() => {
+    state.saveTimer = null;
+    void writeStateNow(state).catch((err: unknown) => {
+      console.warn('[secure-store] persist failed', err);
+    });
+  }, 100);
+}
+
+function requireState(handle: string): HandleState {
+  const s = handles.get(handle);
+  if (!s) throw new Error('secure-store: unknown handle');
+  return s;
+}
+
+export function register(): void {
+  ipcMain.handle(
+    CHANNELS.SECURE_STORE_OPEN,
+    async (_evt, args: SecureStoreOpenArgs): Promise<SecureStoreHandle> => {
+      const encrypted = safeStorage.isEncryptionAvailable();
+      const filePath = filePathFor(args.userId, encrypted);
+      const entries = await loadState(filePath, encrypted);
+      const handle = hashUserId(args.userId);
+      handles.set(handle, { filePath, encrypted, entries, saveTimer: null });
+      return { handle, encrypted };
+    },
+  );
+
+  ipcMain.handle(
+    CHANNELS.SECURE_STORE_GET,
+    async (_evt, handle: string, key: string): Promise<string | null> => {
+      const state = requireState(handle);
+      return state.entries.get(key) ?? null;
+    },
+  );
+
+  ipcMain.handle(
+    CHANNELS.SECURE_STORE_SET,
+    async (_evt, handle: string, key: string, value: string): Promise<void> => {
+      const state = requireState(handle);
+      state.entries.set(key, value);
+      scheduleSave(state);
+    },
+  );
+
+  ipcMain.handle(
+    CHANNELS.SECURE_STORE_REMOVE,
+    async (_evt, handle: string, key: string): Promise<void> => {
+      const state = requireState(handle);
+      state.entries.delete(key);
+      scheduleSave(state);
+    },
+  );
+
+  ipcMain.handle(CHANNELS.SECURE_STORE_CLOSE, async (_evt, handle: string): Promise<void> => {
+    const state = handles.get(handle);
+    if (!state) return;
+    if (state.saveTimer) {
+      clearTimeout(state.saveTimer);
+      state.saveTimer = null;
+      try {
+        await writeStateNow(state);
+      } catch (err: unknown) {
+        console.warn('[secure-store] close-flush failed', err);
+      }
+    }
+    handles.delete(handle);
+  });
+}

apps/desktop/electron/modules/shortcuts.ts

@@ -0,0 +1,86 @@
+// Global shortcuts — wraps Electron's globalShortcut, tracks registrations
+// by an opaque renderer-supplied id so the same accelerator can be
+// re-bound without the caller juggling state.
+//
+// PTT semantics are simulated: Electron's globalShortcut API only delivers
+// a "pressed" callback — it has no keyup / release event. We fire
+// SHORTCUT_EVT_FIRED on press, then after a 200ms timer fire
+// SHORTCUT_EVT_RELEASED. Known limitation; TODO: revisit with
+// `uiohook-napi` or `node-global-key-listener` if the press-and-release
+// UX is too loose.
+
+import { app, BrowserWindow, globalShortcut, ipcMain } from 'electron';
+
+import {
+  CHANNELS,
+  type ShortcutEvent,
+  type ShortcutKind,
+  type ShortcutRegisterArgs,
+} from '../ipc-types';
+
+interface Entry {
+  accelerator: string;
+  kind: ShortcutKind;
+}
+
+const registry = new Map<string, Entry>();
+
+export function register(mainWindow: BrowserWindow): void {
+  const send = (channel: string, payload: ShortcutEvent): void => {
+    if (mainWindow.isDestroyed()) return;
+    mainWindow.webContents.send(channel, payload);
+  };
+
+  ipcMain.handle(
+    CHANNELS.SHORTCUT_REGISTER,
+    async (_evt, args: ShortcutRegisterArgs): Promise<boolean> => {
+      const { id, accelerator, kind } = args;
+      const prev = registry.get(id);
+      if (prev) {
+        try {
+          globalShortcut.unregister(prev.accelerator);
+        } catch {
+          /* ignore */
+        }
+        registry.delete(id);
+      }
+      if (globalShortcut.isRegistered(accelerator)) {
+        return false;
+      }
+      const ok = globalShortcut.register(accelerator, () => {
+        const ts = Date.now();
+        send(CHANNELS.SHORTCUT_EVT_FIRED, { id, ts });
+        if (kind === 'ptt') {
+          setTimeout(() => {
+            send(CHANNELS.SHORTCUT_EVT_RELEASED, { id, ts: Date.now() });
+          }, 200);
+        }
+      });
+      if (!ok) return false;
+      registry.set(id, { accelerator, kind });
+      return true;
+    },
+  );
+
+  ipcMain.handle(CHANNELS.SHORTCUT_UNREGISTER, async (_evt, id: string): Promise<void> => {
+    const entry = registry.get(id);
+    if (!entry) return;
+    try {
+      globalShortcut.unregister(entry.accelerator);
+    } catch {
+      /* already gone */
+    }
+    registry.delete(id);
+  });
+
+  ipcMain.handle(CHANNELS.SHORTCUT_IS_REGISTERED, async (_evt, id: string): Promise<boolean> => {
+    const entry = registry.get(id);
+    if (!entry) return false;
+    return globalShortcut.isRegistered(entry.accelerator);
+  });
+
+  app.on('will-quit', () => {
+    globalShortcut.unregisterAll();
+    registry.clear();
+  });
+}

apps/desktop/electron/modules/sql.ts

@@ -0,0 +1,114 @@
+// SQLite via better-sqlite3. One Database instance per renderer-tracked
+// handle; handles are keyed by the normalised db name (Tauri's plugin-sql
+// uses `sqlite:<name>` — we strip the prefix). Sync API is fine here
+// because the main process has its own event loop; better-sqlite3's
+// prepare/run/all are blocking but fast for typical chat-cache queries
+// (<1ms per op for the current workload).
+//
+// Binding param style: Tauri's plugin-sql used $1, $2... positionals with
+// bindings as an array. SQLite parses `$NAME` as a NAMED parameter
+// (NAME = `1`, `2`, …), not as positional, so better-sqlite3 wants the
+// bindings as `{ '1': v1, '2': v2 }` not `[v1, v2]`. We accept the old
+// array-shape from callers and convert to the named-object on the way in.
+
+import { app, ipcMain } from 'electron';
+import Database from 'better-sqlite3';
+import fs from 'node:fs';
+import path from 'node:path';
+
+import {
+  CHANNELS,
+  type SqlExecuteArgs,
+  type SqlExecuteResult,
+  type SqlLoadArgs,
+  type SqlSelectArgs,
+  type SqlSelectResult,
+} from '../ipc-types';
+
+interface Handle {
+  db: Database.Database;
+  filePath: string;
+}
+
+const handles = new Map<string, Handle>();
+
+function stripPrefix(name: string): string {
+  return name.startsWith('sqlite:') ? name.slice('sqlite:'.length) : name;
+}
+
+function requireHandle(h: string): Handle {
+  const entry = handles.get(h);
+  if (!entry) throw new Error(`sql: unknown handle ${h}`);
+  return entry;
+}
+
+// Convert a positional bindings array `[v1, v2]` to the named-params object
+// `{ '1': v1, '2': v2 }` that better-sqlite3 needs when the SQL uses
+// `$1`/`$2` named placeholders. Returns the original array (spread later)
+// when it's empty.
+function bindParams(bindings: unknown[] | undefined): Record<string, unknown> | [] {
+  const arr = bindings ?? [];
+  if (arr.length === 0) return [];
+  const obj: Record<string, unknown> = {};
+  for (let i = 0; i < arr.length; i++) {
+    obj[String(i + 1)] = arr[i];
+  }
+  return obj;
+}
+
+export function register(): void {
+  ipcMain.handle(CHANNELS.SQL_LOAD, async (_evt, args: SqlLoadArgs): Promise<string> => {
+    const rawName = stripPrefix(args.name);
+    const fileName = rawName.endsWith('.db') ? rawName : rawName + '.db';
+    const filePath = path.join(app.getPath('userData'), fileName);
+    fs.mkdirSync(path.dirname(filePath), { recursive: true });
+    const existing = handles.get(rawName);
+    if (existing) return rawName;
+    const db = new Database(filePath);
+    db.pragma('journal_mode = WAL');
+    handles.set(rawName, { db, filePath });
+    return rawName;
+  });
+
+  ipcMain.handle(
+    CHANNELS.SQL_EXECUTE,
+    async (_evt, args: SqlExecuteArgs): Promise<SqlExecuteResult> => {
+      const entry = requireHandle(args.handle);
+      const stmt = entry.db.prepare(args.query);
+      const params = bindParams(args.bindings);
+      const info = Array.isArray(params) ? stmt.run() : stmt.run(params);
+      return {
+        rowsAffected: info.changes,
+        lastInsertId:
+          typeof info.lastInsertRowid === 'bigint'
+            ? Number(info.lastInsertRowid)
+            : (info.lastInsertRowid ?? null),
+      };
+    },
+  );
+
+  ipcMain.handle(
+    CHANNELS.SQL_SELECT,
+    async (_evt, args: SqlSelectArgs): Promise<SqlSelectResult> => {
+      const entry = requireHandle(args.handle);
+      const stmt = entry.db.prepare(args.query);
+      const params = bindParams(args.bindings);
+      const rows = (Array.isArray(params) ? stmt.all() : stmt.all(params)) as Record<
+        string,
+        unknown
+      >[];
+      return rows;
+    },
+  );
+
+  ipcMain.handle(CHANNELS.SQL_CLOSE, async (_evt, handle: string): Promise<void> => {
+    const entry = handles.get(handle);
+    if (!entry) return;
+    try {
+      entry.db.close();
+    } catch (err: unknown) {
+      console.warn('[sql] close failed', err);
+    }
+    handles.delete(handle);
+  });
+}

apps/desktop/electron/modules/tray.ts

@@ -0,0 +1,145 @@
+// System tray + Windows taskbar overlay badge. Renderer pushes the
+// current aggregate unread count via CHANNELS.TRAY_UNREAD; we update the
+// tooltip and (on Windows) set an overlay icon on the main window's
+// taskbar button.
+//
+// Overlay image is a pre-rendered 16x16 red dot embedded as base64 so
+// the module is self-contained — no runtime canvas dependency.
+
+import {
+  app,
+  BrowserWindow,
+  ipcMain,
+  Menu,
+  nativeImage,
+  type NativeImage,
+  Tray,
+} from 'electron';
+import path from 'node:path';
+
+import { CHANNELS } from '../ipc-types';
+
+let trayRef: Tray | null = null;
+let overlayImage: NativeImage | null = null;
+
+function resolveIconPath(): string {
+  return path.join(process.resourcesPath || app.getAppPath(), 'icon.ico');
+}
+
+function resolveIconPathDev(): string {
+  return path.join(app.getAppPath(), 'resources', 'icon.ico');
+}
+
+// 16×16 grey square — last-ditch fallback when neither the packaged
+// nor dev icon file resolves. Tray constructor on Windows throws when
+// handed an empty NativeImage, which would tear down the whole
+// registrar before `ipcMain.handle(TRAY_UNREAD)` runs — leaving the
+// taskbar overlay badge wired but the renderer's invoke rejecting
+// with "No handler registered". A non-empty placeholder keeps the
+// constructor happy so the IPC handler always gets registered.
+const FALLBACK_TRAY_PNG_BASE64 =
+  'iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAAH0lEQVR42mNk' +
+  'YGD4z0ABYBxVOKpwVOGowlGFwwoBAEnYAR9XlIldAAAAAElFTkSuQmCC';
+
+function loadTrayIcon(): NativeImage {
+  for (const p of [resolveIconPath(), resolveIconPathDev()]) {
+    try {
+      const img = nativeImage.createFromPath(p);
+      if (!img.isEmpty()) return img;
+    } catch {
+      /* try next */
+    }
+  }
+  return nativeImage.createFromBuffer(Buffer.from(FALLBACK_TRAY_PNG_BASE64, 'base64'));
+}
+
+function buildOverlay(): NativeImage {
+  if (overlayImage) return overlayImage;
+  // 16x16 PNG, solid red circle. Inline base64 so no external file lookup.
+  const base64 =
+    'iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAAPElEQVR42mNkYGD4z0AGYBxVSF2F//' +
+    '//Z2BgYGD4/58kBYz4FDAxMDAwMDIwMDD8//+foArGUYWjCoc1AABTgwUBf3lZtAAAAABJRU5ErkJggg==';
+  overlayImage = nativeImage.createFromBuffer(Buffer.from(base64, 'base64'));
+  return overlayImage;
+}
+
+export function register(mainWindow: BrowserWindow): void {
+  // Tray icon is best-effort: if neither the packaged resource nor the
+  // dev path resolves (e.g. icon.ico isn't shipped under resourcesPath
+  // in packaged builds — only the app icon goes into the .exe metadata),
+  // we still want the taskbar overlay badge to work. setOverlayIcon is
+  // a BrowserWindow method, so it functions even when the systray icon
+  // creation fails.
+  try {
+    const icon = loadTrayIcon();
+    if (!icon.isEmpty()) {
+      trayRef = new Tray(icon);
+      trayRef.setToolTip('Netralax');
+
+      const menu = Menu.buildFromTemplate([
+        {
+          label: 'Open',
+          click: (): void => {
+            if (mainWindow.isDestroyed()) return;
+            if (mainWindow.isMinimized()) mainWindow.restore();
+            mainWindow.show();
+            mainWindow.focus();
+          },
+        },
+        { type: 'separator' },
+        {
+          label: 'Quit',
+          click: (): void => {
+            app.quit();
+          },
+        },
+      ]);
+      trayRef.setContextMenu(menu);
+      trayRef.on('click', (): void => {
+        if (mainWindow.isDestroyed()) return;
+        if (mainWindow.isMinimized()) mainWindow.restore();
+        if (mainWindow.isVisible()) mainWindow.focus();
+        else mainWindow.show();
+      });
+    }
+  } catch (err: unknown) {
+    // Swallow: the overlay badge below is the user-visible bit. A missing
+    // systray icon is cosmetic and shouldn't take the unread handler with it.
+    console.warn('[tray] systray init failed, overlay badge still active', err);
+  }
+
+  ipcMain.handle(
+    CHANNELS.TRAY_UNREAD,
+    async (_evt, count: number, badgeDataUrl?: string | null): Promise<void> => {
+      const n = Math.max(0, Math.floor(Number(count) || 0));
+      if (trayRef && !trayRef.isDestroyed()) {
+        trayRef.setToolTip(n > 0 ? `Netralax — ${n} ungelesen` : 'Netralax');
+      }
+      if (mainWindow.isDestroyed()) return;
+      if (process.platform !== 'win32') return;
+      if (n <= 0) {
+        mainWindow.setOverlayIcon(null, '');
+        return;
+      }
+      // Discord-style: prefer the renderer-painted badge (red circle with
+      // the actual unread number). Fall back to the static red dot only if
+      // the renderer didn't supply one or decoding failed — keeps the
+      // visual indicator alive even when the canvas pipeline is unavailable.
+      let overlay: NativeImage | null = null;
+      if (typeof badgeDataUrl === 'string' && badgeDataUrl.startsWith('data:image/')) {
+        const decoded = nativeImage.createFromDataURL(badgeDataUrl);
+        if (!decoded.isEmpty()) overlay = decoded;
+      }
+      mainWindow.setOverlayIcon(overlay ?? buildOverlay(), `${n} ungelesen`);
+    },
+  );
+
+  app.on('before-quit', () => {
+    try {
+      trayRef?.destroy();
+    } catch {
+      /* already gone */
+    }
+    trayRef = null;
+  });
+}

apps/desktop/electron/modules/updater.ts

@@ -0,0 +1,84 @@
+// Auto-updater. Wraps electron-updater; configuration (feed URL) lives in
+// package.json's `build.publish`. In dev (`app.isPackaged === false`) we
+// short-circuit everything — the feed server is production-only and
+// hitting it every launch from a dev machine just adds noise.
+
+import { app, BrowserWindow, ipcMain } from 'electron';
+import electronUpdater, {
+  type ProgressInfo,
+  type UpdateInfo as BuilderUpdateInfo,
+} from 'electron-updater';
+
+// electron-updater is a CJS module; named ESM imports don't work. Pull
+// autoUpdater off the default export instead.
+const { autoUpdater } = electronUpdater;
+
+import {
+  CHANNELS,
+  type UpdateCheckResult,
+  type UpdateInfo,
+  type UpdateProgress,
+} from '../ipc-types';
+
+let cached: BuilderUpdateInfo | null = null;
+
+function toPublicInfo(info: BuilderUpdateInfo | null): UpdateInfo | null {
+  if (!info) return null;
+  const notes = info.releaseNotes;
+  let releaseNotes: string | null = null;
+  if (typeof notes === 'string') releaseNotes = notes;
+  else if (Array.isArray(notes)) releaseNotes = notes.map((r) => r.note).join('\n\n');
+  return {
+    version: info.version ?? '',
+    releaseNotes,
+  };
+}
+
+export function register(mainWindow: BrowserWindow): void {
+  autoUpdater.autoDownload = false;
+  autoUpdater.autoInstallOnAppQuit = false;
+
+  autoUpdater.on('download-progress', (p: ProgressInfo) => {
+    if (mainWindow.isDestroyed()) return;
+    const payload: UpdateProgress = {
+      percent: p.percent ?? 0,
+      transferred: p.transferred ?? 0,
+      total: p.total ?? 0,
+    };
+    mainWindow.webContents.send(CHANNELS.UPDATER_EVT_PROGRESS, payload);
+  });
+
+  ipcMain.handle(CHANNELS.UPDATER_CHECK, async (): Promise<UpdateCheckResult> => {
+    if (!app.isPackaged) {
+      return { available: false, info: null };
+    }
+    try {
+      const result = await autoUpdater.checkForUpdates();
+      if (!result || !result.updateInfo) {
+        cached = null;
+        return { available: false, info: null };
+      }
+      const current = app.getVersion();
+      const remote = result.updateInfo.version;
+      if (!remote || remote === current) {
+        cached = null;
+        return { available: false, info: null };
+      }
+      cached = result.updateInfo;
+      return { available: true, info: toPublicInfo(cached) };
+    } catch (err: unknown) {
+      const msg = err instanceof Error ? err.message : String(err);
+      if (!/ENOTFOUND|ETIMEDOUT|ECONNRESET|404/i.test(msg)) {
+        console.warn('[updater] check failed', err);
+      }
+      return { available: false, info: null };
+    }
+  });
+
+  ipcMain.handle(CHANNELS.UPDATER_DOWNLOAD_INSTALL, async (): Promise<void> => {
+    if (!app.isPackaged) return;
+    if (!cached) throw new Error('no pending update — call check first');
+    await autoUpdater.downloadUpdate();
+    autoUpdater.quitAndInstall();
+  });
+}

apps/desktop/electron/modules/window-content-protection.ts

@@ -0,0 +1,36 @@
+// Window content-protection adapter. Enables / disables OS-level
+// screenshot and screen-recording blocking on the host BrowserWindow.
+//
+//   Windows: WDA_MONITOR (SetWindowDisplayAffinity) — the window surface
+//            appears black in any screen capture tool (OBS, Snipping Tool,
+//            Win+PrtScr, etc.) while protection is enabled.
+//   macOS:   NSWindowSharingNone — equivalent coverage for QuickTime,
+//            Cmd+Shift+3/4, and external recorders.
+//   Linux:   No-op. Electron exposes the API on all platforms but the
+//            X11/Wayland compositors don't honour it in Electron 33.
+//
+// Called by the renderer during view-once image reveals so the image
+// cannot be captured by an OS-level screenshot while it is on screen.
+
+import { BrowserWindow, ipcMain } from 'electron';
+
+import { CHANNELS, type WindowSetContentProtectionArgs } from '../ipc-types';
+
+export function register(mainWindow: BrowserWindow): void {
+  ipcMain.handle(
+    CHANNELS.WINDOW_SET_CONTENT_PROTECTION,
+    (_evt, args: WindowSetContentProtectionArgs) => {
+      // Electron's setContentProtection covers Windows (WDA_MONITOR) and
+      // macOS (NSWindowSharingNone) in one call. No-op on Linux X11.
+      // Wrapped in try/catch because the window can already be destroyed
+      // by the time this fires during a teardown.
+      try {
+        const win = BrowserWindow.fromWebContents(_evt.sender) ?? mainWindow;
+        if (!win || win.isDestroyed()) return;
+        win.setContentProtection(args.enabled);
+      } catch (err) {
+        console.warn('setContentProtection failed', err);
+      }
+    },
+  );
+}

apps/desktop/electron/modules/window-fullscreen.ts

@@ -0,0 +1,64 @@
+// Window fullscreen adapter — replaces Tauri's
+// `getCurrentWindow().setFullscreen(...)` from `@tauri-apps/api/window`.
+// The renderer asks main to flip the OS-level fullscreen flag on the host
+// BrowserWindow so cinema mode covers the Windows taskbar / macOS menubar
+// the way Tauri's appWindow.setFullscreen used to.
+
+import { BrowserWindow, ipcMain } from 'electron';
+
+import { CHANNELS } from '../ipc-types';
+
+export function register(mainWindow: BrowserWindow): void {
+  // Per-window maximize-before-fullscreen memo. We have to drop the
+  // maximized flag on Windows before setFullScreen so DWM recomposes
+  // cleanly (taskbar quirk), but Electron doesn't remember that the
+  // window WAS maximized — exiting fullscreen would leave it as a small
+  // floating window. Track it ourselves keyed by window-id so a future
+  // multi-window setup doesn't cross-pollute state.
+  const wasMaximized = new Map<number, boolean>();
+
+  ipcMain.handle(CHANNELS.WINDOW_SET_FULLSCREEN, (evt, enabled: boolean) => {
+    try {
+      // Prefer the BrowserWindow that issued the IPC so multi-window setups
+      // affect the right host; fall back to the main window we were
+      // registered against (matches autostart.ts's app-singleton shape).
+      const win = BrowserWindow.fromWebContents(evt.sender) ?? mainWindow;
+      if (!win || win.isDestroyed()) return;
+      const id = win.id;
+      if (enabled) {
+        // Windows DWM quirk: maximized → fullscreen sometimes leaves the
+        // taskbar drawn on top of the window because DWM keeps the
+        // maximized work-area constraints. Drop the maximize flag first
+        // so setFullScreen covers the whole monitor cleanly. Remember the
+        // pre-fullscreen state so the exit path can restore it.
+        if (process.platform === 'win32') {
+          const was = win.isMaximized();
+          wasMaximized.set(id, was);
+          if (was) win.unmaximize();
+        }
+        win.setFullScreen(true);
+      } else {
+        win.setFullScreen(false);
+        // Restore maximize if we dropped it on entry. setFullScreen(false)
+        // emits 'leave-full-screen' asynchronously; maximize() needs to
+        // wait until the window is back in normal mode or it silently
+        // no-ops. The event fires same-tick in Electron 33, but we listen
+        // for it once just to be safe across versions.
+        if (process.platform === 'win32' && wasMaximized.get(id)) {
+          wasMaximized.delete(id);
+          const restore = (): void => {
+            if (!win.isDestroyed()) win.maximize();
+          };
+          if (win.isFullScreen()) {
+            win.once('leave-full-screen', restore);
+          } else {
+            restore();
+          }
+        }
+      }
+    } catch (err: unknown) {
+      console.warn('window setFullscreen failed', err);
+      throw err;
+    }
+  });
+}

apps/desktop/electron/preload-types.d.ts

@@ -0,0 +1,123 @@
+// Renderer-visible typing for the preload bridge. Referenced via tsconfig
+// `include` so TS sees `window.electronAPI` without needing to import
+// from `electron` or drag Node types into the renderer build. The
+// ElectronAPI type mirrors the `api` object exported from preload.ts —
+// keep them in sync when adding new methods.
+
+import type {
+  AudioLoopbackChunk,
+  AudioLoopbackStartResult,
+  FsPath,
+  FsRenameArgs,
+  FsWriteArgs,
+  NotifyArgs,
+  ScreenSource,
+  SecureStoreHandle,
+  SecureStoreOpenArgs,
+  ShortcutEvent,
+  ShortcutRegisterArgs,
+  SqlExecuteResult,
+  SqlSelectResult,
+  UpdateCheckResult,
+  UpdateProgress,
+} from './ipc-types';
+
+type Unsubscribe = () => void;
+
+export interface ElectronAPI {
+  /** Opaque runtime marker (value: 'electron-chatapp-v1'). */
+  platform: string;
+  osPlatform: NodeJS.Platform;
+  appVersion: string;
+
+  getScreenSources: () => Promise<ScreenSource[]>;
+  getScreenThumbnail: (sourceId: string) => Promise<string | null>;
+  setPendingShareSource: (sourceId: string | null) => Promise<void>;
+
+  resolveLoopbackSource: () => Promise<{ sourceId: string } | null>;
+
+  /** Native WASAPI process-loopback bridge — Windows only. `start`
+   *  rejects on macOS/Linux or when the .node binary isn't shipped, so
+   *  callers should catch and fall back to the getUserMedia path. */
+  audioLoopback: {
+    start: () => Promise<AudioLoopbackStartResult>;
+    /** Window-share variant: capture only the picked window's process
+     *  tree (INCLUDE_TARGET_PROCESS_TREE). hwnd is the decimal HWND
+     *  parsed from desktopCapturer's `window:<HWND>:0` source id. */
+    startForWindow: (hwnd: number) => Promise<AudioLoopbackStartResult>;
+    stop: (captureId: number) => Promise<void>;
+    onChunk: (cb: (payload: AudioLoopbackChunk) => void) => Unsubscribe;
+  };
+
+  registerShortcut: (args: ShortcutRegisterArgs) => Promise<boolean>;
+  unregisterShortcut: (id: string) => Promise<void>;
+  isShortcutRegistered: (id: string) => Promise<boolean>;
+  onShortcutFired: (cb: (evt: ShortcutEvent) => void) => Unsubscribe;
+  onShortcutReleased: (cb: (evt: ShortcutEvent) => void) => Unsubscribe;
+
+  notify: (args: NotifyArgs) => Promise<void>;
+  getNotificationPermission: () => Promise<'granted' | 'denied' | 'default'>;
+
+  setTrayUnread: (count: number, badgeDataUrl?: string | null) => Promise<void>;
+
+  secureStoreOpen: (args: SecureStoreOpenArgs) => Promise<SecureStoreHandle>;
+  secureStoreGet: (handle: string, key: string) => Promise<string | null>;
+  secureStoreSet: (handle: string, key: string, value: string) => Promise<void>;
+  secureStoreRemove: (handle: string, key: string) => Promise<void>;
+  secureStoreClose: (handle: string) => Promise<void>;
+
+  fsRead: (p: FsPath) => Promise<string | null>;
+  fsWrite: (args: FsWriteArgs) => Promise<void>;
+  fsExists: (p: FsPath) => Promise<boolean>;
+  fsMkdir: (p: FsPath) => Promise<void>;
+  fsRename: (args: FsRenameArgs) => Promise<void>;
+  fsRemove: (p: FsPath) => Promise<void>;
+  fsAppLocalDataDir: () => Promise<string>;
+
+  sqlLoad: (args: { name: string }) => Promise<string>;
+  sqlExecute: (args: {
+    handle: string;
+    query: string;
+    bindings?: unknown[];
+  }) => Promise<SqlExecuteResult>;
+  sqlSelect: (args: {
+    handle: string;
+    query: string;
+    bindings?: unknown[];
+  }) => Promise<SqlSelectResult>;
+  sqlClose: (handle: string) => Promise<void>;
+
+  checkForUpdate: () => Promise<UpdateCheckResult>;
+  downloadInstallUpdate: () => Promise<void>;
+  onUpdaterProgress: (cb: (p: UpdateProgress) => void) => Unsubscribe;
+
+  isAutoStartEnabled: () => Promise<boolean>;
+  setAutoStart: (enabled: boolean) => Promise<void>;
+
+  setFullscreen: (enabled: boolean) => Promise<void>;
+
+  /** Block OS-level screen capture (Win+PrtScr, OBS, etc.) while a
+   *  view-once image is being revealed. Covers Windows (WDA_MONITOR) and
+   *  macOS (NSWindowSharingNone). No-op on Linux X11. Optional: always
+   *  feature-check because the web build has no preload bridge. */
+  setContentProtection?: (enabled: boolean) => Promise<void>;
+
+  /** Subscribe to the main-process pre-quit notification. Used by the
+   *  "Cache beim Schließen leeren" Settings toggle. */
+  onWipeBeforeQuit: (cb: () => Promise<void>) => () => void;
+
+  /** Returns the OS hostname (via Node's `os.hostname()`). Used by
+   *  AuthContext on first launch to populate the `devices` row with a
+   *  human-readable default device name. Optional: always feature-check
+   *  via `typeof window.electronAPI?.getHostname === 'function'` because
+   *  the web build has no preload bridge. */
+  getHostname?: () => Promise<string | null>;
+}
+
+declare global {
+  interface Window {
+    electronAPI: ElectronAPI;
+  }
+}
+
+export {};

apps/desktop/electron/preload.ts

@@ -0,0 +1,191 @@
+// Preload bridge. Exposes a single `window.electronAPI` object to the
+// renderer that mirrors the CHANNELS surface from ipc-types.ts. Each
+// CHANNEL becomes a typed method that calls `ipcRenderer.invoke`; the
+// three event channels (shortcut fired/released + updater progress) get
+// `on*` subscribers that return an unsubscribe function.
+//
+// contextIsolation is ON so the renderer never sees `ipcRenderer` or
+// Node directly — only this curated surface.
+
+import { contextBridge, ipcRenderer } from 'electron';
+
+import {
+  CHANNELS,
+  ELECTRON_RUNTIME_MARKER,
+  type AudioLoopbackChunk,
+  type AudioLoopbackStartResult,
+  type FsPath,
+  type FsRenameArgs,
+  type FsWriteArgs,
+  type NotifyArgs,
+  type ScreenSource,
+  type SecureStoreHandle,
+  type SecureStoreOpenArgs,
+  type ShortcutEvent,
+  type ShortcutRegisterArgs,
+  type SqlExecuteResult,
+  type SqlSelectResult,
+  type UpdateCheckResult,
+  type UpdateProgress,
+} from './ipc-types';
+// Static import of the desktop package.json so the bundler inlines the
+// version string at build time. The previous `process.env.npm_package_-
+// version` approach worked in dev (pnpm sets it as a script env var) but
+// fell back to '0.0.0' in packaged builds — every installed user got
+// flagged as "Update verfügbar" against their own actually-current
+// version. resolveJsonModule + esModuleInterop are on in tsconfig.node.
+import pkg from '../package.json';
+
+type Unsubscribe = () => void;
+
+function on<T>(channel: string, cb: (payload: T) => void): Unsubscribe {
+  const handler = (_evt: Electron.IpcRendererEvent, payload: T): void => cb(payload);
+  ipcRenderer.on(channel, handler);
+  return () => ipcRenderer.removeListener(channel, handler);
+}
+
+const api = {
+  platform: ELECTRON_RUNTIME_MARKER,
+  osPlatform: process.platform as NodeJS.Platform,
+  appVersion: pkg.version,
+
+  // Screen sources ---------------------------------------------------------
+  getScreenSources: (): Promise<ScreenSource[]> => ipcRenderer.invoke(CHANNELS.SCREEN_GET_SOURCES),
+  getScreenThumbnail: (sourceId: string): Promise<string | null> =>
+    ipcRenderer.invoke(CHANNELS.SCREEN_GET_THUMBNAIL, sourceId),
+  /** Tell main which source the user picked in our Discord-style modal,
+   *  BEFORE calling getDisplayMedia. The display-media handler reads this
+   *  and routes the matching desktopCapturer Source into LiveKit. Pass
+   *  null on cancel/error to clear the pending state. */
+  setPendingShareSource: (sourceId: string | null): Promise<void> =>
+    ipcRenderer.invoke(CHANNELS.SCREEN_SET_PENDING_SOURCE, sourceId),
+
+  // Audio loopback ---------------------------------------------------------
+  resolveLoopbackSource: (): Promise<{ sourceId: string } | null> =>
+    ipcRenderer.invoke(CHANNELS.AUDIO_LOOPBACK_RESOLVE_SOURCE),
+
+  /** Native WASAPI process-loopback (Windows only). Captures all system
+   *  audio EXCEPT our own PID tree so peers don't hear themselves echoed
+   *  back. Throws on platforms where the addon isn't available — caller
+   *  is expected to fall back to the renderer-driven getUserMedia path
+   *  (see lib/screenAudio.ts). */
+  audioLoopback: {
+    start: (): Promise<AudioLoopbackStartResult> =>
+      ipcRenderer.invoke(CHANNELS.AUDIO_LOOPBACK_START),
+    /** Window-share variant: capture only the picked window's process
+     *  tree (INCLUDE_TARGET_PROCESS_TREE). hwnd is the decimal HWND
+     *  parsed from desktopCapturer's `window:<HWND>:0` source id. */
+    startForWindow: (hwnd: number): Promise<AudioLoopbackStartResult> =>
+      ipcRenderer.invoke(CHANNELS.AUDIO_LOOPBACK_START_FOR_WINDOW, { hwnd }),
+    stop: (captureId: number): Promise<void> =>
+      ipcRenderer.invoke(CHANNELS.AUDIO_LOOPBACK_STOP, captureId),
+    onChunk: (cb: (payload: AudioLoopbackChunk) => void): Unsubscribe =>
+      on<AudioLoopbackChunk>(CHANNELS.AUDIO_LOOPBACK_CHUNK, cb),
+  },
+
+  // Shortcuts --------------------------------------------------------------
+  registerShortcut: (args: ShortcutRegisterArgs): Promise<boolean> =>
+    ipcRenderer.invoke(CHANNELS.SHORTCUT_REGISTER, args),
+  unregisterShortcut: (id: string): Promise<void> =>
+    ipcRenderer.invoke(CHANNELS.SHORTCUT_UNREGISTER, id),
+  isShortcutRegistered: (id: string): Promise<boolean> =>
+    ipcRenderer.invoke(CHANNELS.SHORTCUT_IS_REGISTERED, id),
+  onShortcutFired: (cb: (evt: ShortcutEvent) => void): Unsubscribe =>
+    on<ShortcutEvent>(CHANNELS.SHORTCUT_EVT_FIRED, cb),
+  onShortcutReleased: (cb: (evt: ShortcutEvent) => void): Unsubscribe =>
+    on<ShortcutEvent>(CHANNELS.SHORTCUT_EVT_RELEASED, cb),
+
+  // Notifications ----------------------------------------------------------
+  notify: (args: NotifyArgs): Promise<void> => ipcRenderer.invoke(CHANNELS.NOTIFY_SHOW, args),
+  getNotificationPermission: (): Promise<'granted' | 'denied' | 'default'> =>
+    ipcRenderer.invoke(CHANNELS.NOTIFY_PERMISSION),
+
+  // Tray -------------------------------------------------------------------
+  // `badgeDataUrl` (optional): renderer-painted PNG (data:image/png;base64)
+  // that main applies as the Windows taskbar overlay icon. We render in the
+  // renderer because main has no Canvas2D; passing a finished image avoids
+  // bundling a native canvas backend just for a 32×32 badge.
+  setTrayUnread: (count: number, badgeDataUrl?: string | null): Promise<void> =>
+    ipcRenderer.invoke(CHANNELS.TRAY_UNREAD, count, badgeDataUrl ?? null),
+
+  // Secure store -----------------------------------------------------------
+  secureStoreOpen: (args: SecureStoreOpenArgs): Promise<SecureStoreHandle> =>
+    ipcRenderer.invoke(CHANNELS.SECURE_STORE_OPEN, args),
+  secureStoreGet: (handle: string, key: string): Promise<string | null> =>
+    ipcRenderer.invoke(CHANNELS.SECURE_STORE_GET, handle, key),
+  secureStoreSet: (handle: string, key: string, value: string): Promise<void> =>
+    ipcRenderer.invoke(CHANNELS.SECURE_STORE_SET, handle, key, value),
+  secureStoreRemove: (handle: string, key: string): Promise<void> =>
+    ipcRenderer.invoke(CHANNELS.SECURE_STORE_REMOVE, handle, key),
+  secureStoreClose: (handle: string): Promise<void> =>
+    ipcRenderer.invoke(CHANNELS.SECURE_STORE_CLOSE, handle),
+
+  // Filesystem -------------------------------------------------------------
+  fsRead: (p: FsPath): Promise<string | null> => ipcRenderer.invoke(CHANNELS.FS_READ, p),
+  fsWrite: (args: FsWriteArgs): Promise<void> => ipcRenderer.invoke(CHANNELS.FS_WRITE, args),
+  fsExists: (p: FsPath): Promise<boolean> => ipcRenderer.invoke(CHANNELS.FS_EXISTS, p),
+  fsMkdir: (p: FsPath): Promise<void> => ipcRenderer.invoke(CHANNELS.FS_MKDIR, p),
+  fsRename: (args: FsRenameArgs): Promise<void> => ipcRenderer.invoke(CHANNELS.FS_RENAME, args),
+  fsRemove: (p: FsPath): Promise<void> => ipcRenderer.invoke(CHANNELS.FS_REMOVE, p),
+  fsAppLocalDataDir: (): Promise<string> => ipcRenderer.invoke(CHANNELS.FS_APP_LOCAL_DATA_DIR),
+
+  // SQL --------------------------------------------------------------------
+  sqlLoad: (args: { name: string }): Promise<string> =>
+    ipcRenderer.invoke(CHANNELS.SQL_LOAD, args),
+  sqlExecute: (args: {
+    handle: string;
+    query: string;
+    bindings?: unknown[];
+  }): Promise<SqlExecuteResult> => ipcRenderer.invoke(CHANNELS.SQL_EXECUTE, args),
+  sqlSelect: (args: {
+    handle: string;
+    query: string;
+    bindings?: unknown[];
+  }): Promise<SqlSelectResult> => ipcRenderer.invoke(CHANNELS.SQL_SELECT, args),
+  sqlClose: (handle: string): Promise<void> => ipcRenderer.invoke(CHANNELS.SQL_CLOSE, handle),
+
+  // Updater ----------------------------------------------------------------
+  checkForUpdate: (): Promise<UpdateCheckResult> => ipcRenderer.invoke(CHANNELS.UPDATER_CHECK),
+  downloadInstallUpdate: (): Promise<void> =>
+    ipcRenderer.invoke(CHANNELS.UPDATER_DOWNLOAD_INSTALL),
+  onUpdaterProgress: (cb: (p: UpdateProgress) => void): Unsubscribe =>
+    on<UpdateProgress>(CHANNELS.UPDATER_EVT_PROGRESS, cb),
+
+  // Autostart --------------------------------------------------------------
+  isAutoStartEnabled: (): Promise<boolean> => ipcRenderer.invoke(CHANNELS.AUTOSTART_IS_ENABLED),
+  setAutoStart: (enabled: boolean): Promise<void> =>
+    ipcRenderer.invoke(CHANNELS.AUTOSTART_SET, enabled),
+
+  // Window fullscreen ------------------------------------------------------
+  setFullscreen: (enabled: boolean): Promise<void> =>
+    ipcRenderer.invoke(CHANNELS.WINDOW_SET_FULLSCREEN, enabled),
+
+  // Window content protection ----------------------------------------------
+  setContentProtection: (enabled: boolean): Promise<void> =>
+    ipcRenderer.invoke(CHANNELS.WINDOW_SET_CONTENT_PROTECTION, { enabled }),
+
+  // OS hostname ------------------------------------------------------------
+  getHostname: (): Promise<string | null> => ipcRenderer.invoke(CHANNELS.APP_HOSTNAME),
+
+  // Wipe-on-close ----------------------------------------------------------
+  // Subscribe to the main-process pre-quit notification. The renderer's
+  // callback does the actual wipe (memoryWipe.ts) and resolves; we ack
+  // unconditionally so main can finish quitting — better to lose the wipe
+  // than to hang the app shutdown if the callback throws.
+  onWipeBeforeQuit: (cb: () => Promise<void>): Unsubscribe => {
+    const handler = async (_evt: Electron.IpcRendererEvent): Promise<void> => {
+      try {
+        await cb();
+      } catch (err) {
+        console.warn('[wipe] renderer cb failed', err);
+      }
+      ipcRenderer.send(CHANNELS.APP_WIPE_BEFORE_QUIT + ':done');
+    };
+    ipcRenderer.on(CHANNELS.APP_WIPE_BEFORE_QUIT, handler);
+    return () => ipcRenderer.removeListener(CHANNELS.APP_WIPE_BEFORE_QUIT, handler);
+  },
+} as const;
+
+export type ElectronAPI = typeof api;
+
+contextBridge.exposeInMainWorld('electronAPI', api);

apps/desktop/electron/window-state.ts

@@ -0,0 +1,91 @@
+// Persists BrowserWindow bounds + maximized state to userData/<filename>.
+// Saves are debounced 500ms on move/resize, and fired synchronously on close.
+// Validates loaded bounds against the current display layout to avoid
+// restoring a window onto a display that no longer exists.
+
+import { app, BrowserWindow, screen } from 'electron';
+import { promises as fs } from 'node:fs';
+import path from 'node:path';
+
+interface State {
+  x?: number;
+  y?: number;
+  width: number;
+  height: number;
+  maximized?: boolean;
+}
+
+const DEFAULT: State = { width: 1200, height: 800 };
+
+function isOnAnyDisplay(bounds: { x: number; y: number; width: number; height: number }): boolean {
+  for (const d of screen.getAllDisplays()) {
+    const wa = d.workArea;
+    if (
+      bounds.x >= wa.x &&
+      bounds.y >= wa.y &&
+      bounds.x + bounds.width <= wa.x + wa.width + 8 &&
+      bounds.y + bounds.height <= wa.y + wa.height + 8
+    ) {
+      return true;
+    }
+  }
+  return false;
+}
+
+export async function loadState(filename: string): Promise<State> {
+  const filePath = path.join(app.getPath('userData'), filename);
+  try {
+    const raw = await fs.readFile(filePath, 'utf8');
+    const parsed = JSON.parse(raw) as Partial<State>;
+    const width = typeof parsed.width === 'number' ? parsed.width : DEFAULT.width;
+    const height = typeof parsed.height === 'number' ? parsed.height : DEFAULT.height;
+    const state: State = { width, height };
+    if (typeof parsed.x === 'number' && typeof parsed.y === 'number') {
+      if (isOnAnyDisplay({ x: parsed.x, y: parsed.y, width, height })) {
+        state.x = parsed.x;
+        state.y = parsed.y;
+      }
+    }
+    if (parsed.maximized) state.maximized = true;
+    return state;
+  } catch {
+    return { ...DEFAULT };
+  }
+}
+
+export function attach(win: BrowserWindow, filename: string): void {
+  const filePath = path.join(app.getPath('userData'), filename);
+  let saveTimer: NodeJS.Timeout | null = null;
+
+  const writeNow = (): void => {
+    if (win.isDestroyed()) return;
+    const bounds = win.getNormalBounds();
+    const state: State = {
+      x: bounds.x,
+      y: bounds.y,
+      width: bounds.width,
+      height: bounds.height,
+      maximized: win.isMaximized(),
+    };
+    // Fire-and-forget; exceptions are logged but non-fatal.
+    void fs
+      .writeFile(filePath, JSON.stringify(state), 'utf8')
+      .catch((err: unknown) => {
+        console.warn('[window-state] write failed', err);
+      });
+  };
+
+  const schedule = (): void => {
+    if (saveTimer) clearTimeout(saveTimer);
+    saveTimer = setTimeout(writeNow, 500);
+  };
+
+  win.on('move', schedule);
+  win.on('resize', schedule);
+  win.on('maximize', schedule);
+  win.on('unmaximize', schedule);
+  win.on('close', () => {
+    if (saveTimer) clearTimeout(saveTimer);
+    writeNow();
+  });
+}

apps/desktop/native/audio-loopback/Cargo.lock

@@ -0,0 +1,380 @@
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+# It is not intended for manual editing.
+version = 4
+
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apps/desktop/native/audio-loopback/Cargo.toml

@@ -0,0 +1,31 @@
+[package]
+name = "audio-loopback"
+version = "0.1.0"
+edition = "2021"
+license = "MIT OR Apache-2.0"
+publish = false
+description = "Native Windows process-loopback audio capture for ChatApp Electron"
+
+[lib]
+crate-type = ["cdylib"]
+
+# Reduce binary size on release builds and avoid the default-features
+# panic-handler that bloats node addons. We don't strip — keeping symbols
+# helps debug crashes from a packaged build.
+[profile.release]
+lto = true
+codegen-units = 1
+panic = "abort"
+
+[dependencies]
+napi = { version = "2", default-features = false, features = ["napi6"] }
+napi-derive = "2"
+
+[target.'cfg(target_os = "windows")'.dependencies]
+# Match the Tauri reference exactly. Cargo.lock there pins 0.15.0; the
+# 0.15 family exposes AudioClient::new_application_loopback_client(pid,
+# include_tree) which is the load-bearing API for EXCLUDE_TARGET_PROCESS_TREE.
+wasapi = "0.15"
+
+[build-dependencies]
+napi-build = "2"

apps/desktop/native/audio-loopback/build.rs

@@ -0,0 +1,10 @@
+// napi-rs build helper. Generates the platform-specific binding glue
+// (e.g. typedefs, init symbols) that `napi build` consumes. Required for
+// every napi-rs crate; the build will silently produce a half-wired
+// binding without it.
+
+extern crate napi_build;
+
+fn main() {
+    napi_build::setup();
+}

apps/desktop/native/audio-loopback/index.d.ts

@@ -0,0 +1,35 @@
+/* tslint:disable */
+/* eslint-disable */
+
+/* auto-generated by NAPI-RS */
+
+/**
+ * Start a process-loopback capture that excludes the current process
+ * tree. The supplied JS callback is invoked from a background thread
+ * with one argument: a Float32Array of interleaved f32 stereo samples
+ * at 48kHz. Returns a numeric capture id that must be passed to
+ * `stopCapture` when the share ends.
+ *
+ * Always excludes `std::process::id()` (whole-OS-mixer-minus-self).
+ * For "include only this app" use `start_capture_for_pid` instead.
+ */
+export declare function startCapture(callback: (...args: any[]) => any): number
+/**
+ * Start a process-loopback capture that INCLUDES the target PID's
+ * process tree (and only that tree) — the WASAPI
+ * INCLUDE_TARGET_PROCESS_TREE mode. Used for window-shares where we
+ * want only the picked app's audio (Discord parity).
+ */
+export declare function startCaptureForPid(pid: number, callback: (...args: any[]) => any): number
+/**
+ * Resolve the owning process id of a top-level window handle. The
+ * renderer derives `hwnd` from desktopCapturer's `window:<HWND>:0`
+ * source ids and we hand that to `start_capture_for_pid`.
+ */
+export declare function resolveWindowPid(hwnd: number): number
+/**
+ * Tear down the capture for the given id. Safe to call on a missing id
+ * (no-op) so the JS side doesn't have to track whether the stop has
+ * already been issued by the screen-share teardown path.
+ */
+export declare function stopCapture(captureId: number): void

apps/desktop/native/audio-loopback/index.js

@@ -0,0 +1,318 @@
+/* tslint:disable */
+/* eslint-disable */
+/* prettier-ignore */
+
+/* auto-generated by NAPI-RS */
+
+const { existsSync, readFileSync } = require('fs')
+const { join } = require('path')
+
+const { platform, arch } = process
+
+let nativeBinding = null
+let localFileExisted = false
+let loadError = null
+
+function isMusl() {
+  // For Node 10
+  if (!process.report || typeof process.report.getReport !== 'function') {
+    try {
+      const lddPath = require('child_process').execSync('which ldd').toString().trim()
+      return readFileSync(lddPath, 'utf8').includes('musl')
+    } catch (e) {
+      return true
+    }
+  } else {
+    const { glibcVersionRuntime } = process.report.getReport().header
+    return !glibcVersionRuntime
+  }
+}
+
+switch (platform) {
+  case 'android':
+    switch (arch) {
+      case 'arm64':
+        localFileExisted = existsSync(join(__dirname, 'audio-loopback.android-arm64.node'))
+        try {
+          if (localFileExisted) {
+            nativeBinding = require('./audio-loopback.android-arm64.node')
+          } else {
+            nativeBinding = require('@chatapp/audio-loopback-native-android-arm64')
+          }
+        } catch (e) {
+          loadError = e
+        }
+        break
+      case 'arm':
+        localFileExisted = existsSync(join(__dirname, 'audio-loopback.android-arm-eabi.node'))
+        try {
+          if (localFileExisted) {
+            nativeBinding = require('./audio-loopback.android-arm-eabi.node')
+          } else {
+            nativeBinding = require('@chatapp/audio-loopback-native-android-arm-eabi')
+          }
+        } catch (e) {
+          loadError = e
+        }
+        break
+      default:
+        throw new Error(`Unsupported architecture on Android ${arch}`)
+    }
+    break
+  case 'win32':
+    switch (arch) {
+      case 'x64':
+        localFileExisted = existsSync(
+          join(__dirname, 'audio-loopback.win32-x64-msvc.node')
+        )
+        try {
+          if (localFileExisted) {
+            nativeBinding = require('./audio-loopback.win32-x64-msvc.node')
+          } else {
+            nativeBinding = require('@chatapp/audio-loopback-native-win32-x64-msvc')
+          }
+        } catch (e) {
+          loadError = e
+        }
+        break
+      case 'ia32':
+        localFileExisted = existsSync(
+          join(__dirname, 'audio-loopback.win32-ia32-msvc.node')
+        )
+        try {
+          if (localFileExisted) {
+            nativeBinding = require('./audio-loopback.win32-ia32-msvc.node')
+          } else {
+            nativeBinding = require('@chatapp/audio-loopback-native-win32-ia32-msvc')
+          }
+        } catch (e) {
+          loadError = e
+        }
+        break
+      case 'arm64':
+        localFileExisted = existsSync(
+          join(__dirname, 'audio-loopback.win32-arm64-msvc.node')
+        )
+        try {
+          if (localFileExisted) {
+            nativeBinding = require('./audio-loopback.win32-arm64-msvc.node')
+          } else {
+            nativeBinding = require('@chatapp/audio-loopback-native-win32-arm64-msvc')
+          }
+        } catch (e) {
+          loadError = e
+        }
+        break
+      default:
+        throw new Error(`Unsupported architecture on Windows: ${arch}`)
+    }
+    break
+  case 'darwin':
+    localFileExisted = existsSync(join(__dirname, 'audio-loopback.darwin-universal.node'))
+    try {
+      if (localFileExisted) {
+        nativeBinding = require('./audio-loopback.darwin-universal.node')
+      } else {
+        nativeBinding = require('@chatapp/audio-loopback-native-darwin-universal')
+      }
+      break
+    } catch {}
+    switch (arch) {
+      case 'x64':
+        localFileExisted = existsSync(join(__dirname, 'audio-loopback.darwin-x64.node'))
+        try {
+          if (localFileExisted) {
+            nativeBinding = require('./audio-loopback.darwin-x64.node')
+          } else {
+            nativeBinding = require('@chatapp/audio-loopback-native-darwin-x64')
+          }
+        } catch (e) {
+          loadError = e
+        }
+        break
+      case 'arm64':
+        localFileExisted = existsSync(
+          join(__dirname, 'audio-loopback.darwin-arm64.node')
+        )
+        try {
+          if (localFileExisted) {
+            nativeBinding = require('./audio-loopback.darwin-arm64.node')
+          } else {
+            nativeBinding = require('@chatapp/audio-loopback-native-darwin-arm64')
+          }
+        } catch (e) {
+          loadError = e
+        }
+        break
+      default:
+        throw new Error(`Unsupported architecture on macOS: ${arch}`)
+    }
+    break
+  case 'freebsd':
+    if (arch !== 'x64') {
+      throw new Error(`Unsupported architecture on FreeBSD: ${arch}`)
+    }
+    localFileExisted = existsSync(join(__dirname, 'audio-loopback.freebsd-x64.node'))
+    try {
+      if (localFileExisted) {
+        nativeBinding = require('./audio-loopback.freebsd-x64.node')
+      } else {
+        nativeBinding = require('@chatapp/audio-loopback-native-freebsd-x64')
+      }
+    } catch (e) {
+      loadError = e
+    }
+    break
+  case 'linux':
+    switch (arch) {
+      case 'x64':
+        if (isMusl()) {
+          localFileExisted = existsSync(
+            join(__dirname, 'audio-loopback.linux-x64-musl.node')
+          )
+          try {
+            if (localFileExisted) {
+              nativeBinding = require('./audio-loopback.linux-x64-musl.node')
+            } else {
+              nativeBinding = require('@chatapp/audio-loopback-native-linux-x64-musl')
+            }
+          } catch (e) {
+            loadError = e
+          }
+        } else {
+          localFileExisted = existsSync(
+            join(__dirname, 'audio-loopback.linux-x64-gnu.node')
+          )
+          try {
+            if (localFileExisted) {
+              nativeBinding = require('./audio-loopback.linux-x64-gnu.node')
+            } else {
+              nativeBinding = require('@chatapp/audio-loopback-native-linux-x64-gnu')
+            }
+          } catch (e) {
+            loadError = e
+          }
+        }
+        break
+      case 'arm64':
+        if (isMusl()) {
+          localFileExisted = existsSync(
+            join(__dirname, 'audio-loopback.linux-arm64-musl.node')
+          )
+          try {
+            if (localFileExisted) {
+              nativeBinding = require('./audio-loopback.linux-arm64-musl.node')
+            } else {
+              nativeBinding = require('@chatapp/audio-loopback-native-linux-arm64-musl')
+            }
+          } catch (e) {
+            loadError = e
+          }
+        } else {
+          localFileExisted = existsSync(
+            join(__dirname, 'audio-loopback.linux-arm64-gnu.node')
+          )
+          try {
+            if (localFileExisted) {
+              nativeBinding = require('./audio-loopback.linux-arm64-gnu.node')
+            } else {
+              nativeBinding = require('@chatapp/audio-loopback-native-linux-arm64-gnu')
+            }
+          } catch (e) {
+            loadError = e
+          }
+        }
+        break
+      case 'arm':
+        if (isMusl()) {
+          localFileExisted = existsSync(
+            join(__dirname, 'audio-loopback.linux-arm-musleabihf.node')
+          )
+          try {
+            if (localFileExisted) {
+              nativeBinding = require('./audio-loopback.linux-arm-musleabihf.node')
+            } else {
+              nativeBinding = require('@chatapp/audio-loopback-native-linux-arm-musleabihf')
+            }
+          } catch (e) {
+            loadError = e
+          }
+        } else {
+          localFileExisted = existsSync(
+            join(__dirname, 'audio-loopback.linux-arm-gnueabihf.node')
+          )
+          try {
+            if (localFileExisted) {
+              nativeBinding = require('./audio-loopback.linux-arm-gnueabihf.node')
+            } else {
+              nativeBinding = require('@chatapp/audio-loopback-native-linux-arm-gnueabihf')
+            }
+          } catch (e) {
+            loadError = e
+          }
+        }
+        break
+      case 'riscv64':
+        if (isMusl()) {
+          localFileExisted = existsSync(
+            join(__dirname, 'audio-loopback.linux-riscv64-musl.node')
+          )
+          try {
+            if (localFileExisted) {
+              nativeBinding = require('./audio-loopback.linux-riscv64-musl.node')
+            } else {
+              nativeBinding = require('@chatapp/audio-loopback-native-linux-riscv64-musl')
+            }
+          } catch (e) {
+            loadError = e
+          }
+        } else {
+          localFileExisted = existsSync(
+            join(__dirname, 'audio-loopback.linux-riscv64-gnu.node')
+          )
+          try {
+            if (localFileExisted) {
+              nativeBinding = require('./audio-loopback.linux-riscv64-gnu.node')
+            } else {
+              nativeBinding = require('@chatapp/audio-loopback-native-linux-riscv64-gnu')
+            }
+          } catch (e) {
+            loadError = e
+          }
+        }
+        break
+      case 's390x':
+        localFileExisted = existsSync(
+          join(__dirname, 'audio-loopback.linux-s390x-gnu.node')
+        )
+        try {
+          if (localFileExisted) {
+            nativeBinding = require('./audio-loopback.linux-s390x-gnu.node')
+          } else {
+            nativeBinding = require('@chatapp/audio-loopback-native-linux-s390x-gnu')
+          }
+        } catch (e) {
+          loadError = e
+        }
+        break
+      default:
+        throw new Error(`Unsupported architecture on Linux: ${arch}`)
+    }
+    break
+  default:
+    throw new Error(`Unsupported OS: ${platform}, architecture: ${arch}`)
+}
+
+if (!nativeBinding) {
+  if (loadError) {
+    throw loadError
+  }
+  throw new Error(`Failed to load native binding`)
+}
+
+const { startCapture, startCaptureForPid, resolveWindowPid, stopCapture } = nativeBinding
+
+module.exports.startCapture = startCapture
+module.exports.startCaptureForPid = startCaptureForPid
+module.exports.resolveWindowPid = resolveWindowPid
+module.exports.stopCapture = stopCapture

apps/desktop/native/audio-loopback/package.json

@@ -0,0 +1,32 @@
+{
+  "name": "@chatapp/audio-loopback-native",
+  "version": "0.1.0",
+  "private": true,
+  "description": "Native Windows process-loopback audio capture addon (excludes our own PID tree)",
+  "main": "index.js",
+  "types": "index.d.ts",
+  "files": [
+    "index.js",
+    "index.d.ts",
+    "*.node"
+  ],
+  "napi": {
+    "name": "audio-loopback",
+    "triples": {
+      "defaults": false,
+      "additional": [
+        "x86_64-pc-windows-msvc"
+      ]
+    }
+  },
+  "scripts": {
+    "build": "napi build --platform --release",
+    "build:debug": "napi build --platform"
+  },
+  "devDependencies": {
+    "@napi-rs/cli": "^2.18.0"
+  },
+  "engines": {
+    "node": ">= 18"
+  }
+}

apps/desktop/native/audio-loopback/src/lib.rs

@@ -0,0 +1,339 @@
+// Native system-audio capture addon for the ChatApp Electron desktop
+// client. Mirrors the proven Tauri implementation
+// (apps/desktop/src-tauri/src/screen_audio.rs in the legacy repo).
+//
+// Why a native addon at all when Electron already exposes a 'loopback'
+// audio source through setDisplayMediaRequestHandler? Because Chromium's
+// loopback captures the entire OS mixer including our own renderer's
+// playback — peers in a video call hear themselves echoed back when the
+// sharer ticks "system audio". Windows ships an EXCLUDE_TARGET_PROCESS_TREE
+// process-loopback mode that captures every render session except the
+// targeted PID's tree. We pass our own PID so the LiveKit playback never
+// re-enters the outgoing share.
+//
+// Wire format is fixed at 48kHz interleaved f32 stereo. The renderer-
+// side AudioWorklet (lib/loopbackAudio.ts) assumes that layout and feeds
+// samples into a MediaStreamDestination so LiveKit publishes a plain
+// ScreenShareAudio track.
+//
+// Windows-only for v1. macOS/Linux stubs return a clear napi::Error so
+// the renderer can fall through to the existing getUserMedia path.
+
+#![allow(clippy::needless_return)]
+
+use napi::bindgen_prelude::{Float32Array, Result};
+use napi::threadsafe_function::{
+    ErrorStrategy, ThreadsafeFunction, ThreadsafeFunctionCallMode,
+};
+use napi::JsFunction;
+use napi_derive::napi;
+use std::collections::HashMap;
+use std::sync::atomic::{AtomicBool, AtomicU32, Ordering};
+use std::sync::{Arc, Mutex, OnceLock};
+use std::thread;
+
+// Output format we always deliver to the frontend. Pinning a single fixed
+// format means the AudioWorklet never has to renegotiate — it just
+// assumes interleaved f32 stereo at 48kHz. WASAPI mix format is usually
+// already this on Windows 10+, so the resample/upmix branch inside
+// process-loopback's autoconvert is rarely hit.
+const OUTPUT_SAMPLE_RATE: u32 = 48_000;
+const OUTPUT_CHANNELS: u16 = 2;
+
+static NEXT_ID: AtomicU32 = AtomicU32::new(1);
+static SESSIONS: OnceLock<Mutex<HashMap<u32, Session>>> = OnceLock::new();
+
+fn sessions() -> &'static Mutex<HashMap<u32, Session>> {
+    SESSIONS.get_or_init(|| Mutex::new(HashMap::new()))
+}
+
+struct Session {
+    stop: Arc<AtomicBool>,
+    handle: Option<thread::JoinHandle<()>>,
+}
+
+/// Start a process-loopback capture that excludes the current process
+/// tree. The supplied JS callback is invoked from a background thread
+/// with one argument: a Float32Array of interleaved f32 stereo samples
+/// at 48kHz. Returns a numeric capture id that must be passed to
+/// `stopCapture` when the share ends.
+///
+/// Always excludes `std::process::id()` (whole-OS-mixer-minus-self).
+/// For "include only this app" use `start_capture_for_pid` instead.
+#[napi]
+pub fn start_capture(callback: JsFunction) -> Result<u32> {
+    spawn_capture_session(callback, std::process::id(), false)
+}
+
+/// Start a process-loopback capture that INCLUDES the target PID's
+/// process tree (and only that tree) — the WASAPI
+/// INCLUDE_TARGET_PROCESS_TREE mode. Used for window-shares where we
+/// want only the picked app's audio (Discord parity).
+#[napi]
+pub fn start_capture_for_pid(pid: u32, callback: JsFunction) -> Result<u32> {
+    spawn_capture_session(callback, pid, true)
+}
+
+/// Resolve the owning process id of a top-level window handle. The
+/// renderer derives `hwnd` from desktopCapturer's `window:<HWND>:0`
+/// source ids and we hand that to `start_capture_for_pid`.
+#[napi]
+pub fn resolve_window_pid(hwnd: u32) -> Result<u32> {
+    #[cfg(target_os = "windows")]
+    {
+        // Minimal FFI to user32!GetWindowThreadProcessId — pulling in a
+        // full windows crate just for one call would balloon build
+        // times. The function returns the thread id (we ignore it) and
+        // writes the process id through the pointer.
+        #[allow(non_snake_case)]
+        extern "system" {
+            fn GetWindowThreadProcessId(hWnd: usize, lpdwProcessId: *mut u32) -> u32;
+        }
+        let mut pid: u32 = 0;
+        // SAFETY: GetWindowThreadProcessId tolerates an invalid HWND
+        // (returns 0 thread id and leaves *lpdwProcessId untouched). We
+        // detect the failure case by checking for pid == 0 below.
+        let thread_id = unsafe { GetWindowThreadProcessId(hwnd as usize, &mut pid) };
+        if thread_id == 0 || pid == 0 {
+            return Err(napi::Error::from_reason(format!(
+                "GetWindowThreadProcessId({hwnd}) failed — window may have closed"
+            )));
+        }
+        Ok(pid)
+    }
+
+    #[cfg(not(target_os = "windows"))]
+    {
+        let _ = hwnd;
+        Err(napi::Error::from_reason(
+            "resolve_window_pid only supported on Windows",
+        ))
+    }
+}
+
+#[cfg(target_os = "windows")]
+fn spawn_capture_session(
+    callback: JsFunction,
+    pid: u32,
+    include_tree: bool,
+) -> Result<u32> {
+    // ErrorStrategy::Fatal — the JS callback signature is `(samples)`
+    // not `(err, samples)`, so we don't want napi to inject an
+    // error slot. If anything goes wrong on the Rust side we tear
+    // the session down and stop calling the callback.
+    let tsfn: ThreadsafeFunction<Float32Array, ErrorStrategy::Fatal> =
+        callback.create_threadsafe_function(0, |ctx| Ok(vec![ctx.value]))?;
+
+    let capture_id = NEXT_ID.fetch_add(1, Ordering::Relaxed);
+    let stop = Arc::new(AtomicBool::new(false));
+    let stop_clone = Arc::clone(&stop);
+
+    let handle = thread::Builder::new()
+        .name(format!("audio-loopback-{capture_id}"))
+        .spawn(move || {
+            if let Err(err) = windows_loopback::capture_loop(
+                capture_id,
+                tsfn,
+                stop_clone,
+                pid,
+                include_tree,
+            ) {
+                eprintln!("audio-loopback {capture_id}: {err}");
+            }
+        })
+        .map_err(|e| {
+            napi::Error::from_reason(format!("failed to spawn audio thread: {e}"))
+        })?;
+
+    sessions().lock().unwrap().insert(
+        capture_id,
+        Session {
+            stop,
+            handle: Some(handle),
+        },
+    );
+    Ok(capture_id)
+}
+
+#[cfg(not(target_os = "windows"))]
+fn spawn_capture_session(
+    callback: JsFunction,
+    _pid: u32,
+    _include_tree: bool,
+) -> Result<u32> {
+    let _ = callback;
+    Err(napi::Error::from_reason(
+        "system audio capture only supported on Windows",
+    ))
+}
+
+/// Tear down the capture for the given id. Safe to call on a missing id
+/// (no-op) so the JS side doesn't have to track whether the stop has
+/// already been issued by the screen-share teardown path.
+#[napi]
+pub fn stop_capture(capture_id: u32) -> Result<()> {
+    let session = sessions().lock().unwrap().remove(&capture_id);
+    let Some(mut session) = session else {
+        return Ok(());
+    };
+    session.stop.store(true, Ordering::Relaxed);
+    if let Some(handle) = session.handle.take() {
+        // Best-effort join — the capture loop polls `stop` every event
+        // cycle (≤100ms) so this usually returns promptly. If a WASAPI
+        // call is wedged we'd rather drop the handle than hang the JS
+        // teardown path.
+        let _ = handle.join();
+    }
+    Ok(())
+}
+
+// ---------------------------------------------------------------------------
+// Windows loopback implementation
+// ---------------------------------------------------------------------------
+
+#[cfg(target_os = "windows")]
+mod windows_loopback {
+    use super::*;
+    use wasapi::{initialize_mta, AudioClient, Direction, SampleType, ShareMode, WaveFormat};
+
+    // 200ms request buffer in 100ns units. Process-loopback clients
+    // ignore the period for shared-mode but the API still requires a
+    // non-zero value — picking 200ms keeps wakeups infrequent enough
+    // that we don't spin the capture thread on idle audio.
+    const REQUESTED_BUFFER_HNS: i64 = 2_000_000;
+
+    pub fn capture_loop(
+        capture_id: u32,
+        tsfn: ThreadsafeFunction<Float32Array, ErrorStrategy::Fatal>,
+        stop: Arc<AtomicBool>,
+        pid: u32,
+        include_tree: bool,
+    ) -> std::result::Result<(), String> {
+        // COM must be initialised on every thread that touches WASAPI.
+        // MTA is the right model for a background capture thread —
+        // STA would require message pumping we don't want to add.
+        initialize_mta()
+            .ok()
+            .map_err(|e| format!("initialize_mta: {e:?}"))?;
+
+        // Process-loopback. Two modes — selected by `include_tree`:
+        //   false → EXCLUDE_TARGET_PROCESS_TREE: every render session on
+        //           the box *except* the given PID's tree. Default for
+        //           full-screen shares so LiveKit playback stays out of
+        //           the outgoing audio (we pass our own PID).
+        //   true  → INCLUDE_TARGET_PROCESS_TREE: only the given PID's
+        //           tree. Used for window-shares so the captured audio
+        //           is exactly the picked app (Discord parity).
+        // The `include_tree` flag is the load-bearing arg to
+        // `new_application_loopback_client`; do not flip without
+        // re-reading the wasapi crate's docs.
+        let mut audio_client =
+            AudioClient::new_application_loopback_client(pid, include_tree)
+                .map_err(|e| format!("new_application_loopback_client: {e:?}"))?;
+
+        // Process-loopback only accepts caller-specified formats —
+        // `get_mixformat` is documented as broken on this client. We
+        // pin the wire format we already deliver downstream: 48kHz,
+        // 32-bit float, stereo. `autoconvert=true` (the trailing `true`
+        // arg to initialize_client) lets WASAPI mix arbitrary session
+        // formats into ours so games at 44.1k or mono notification
+        // sounds don't blow up the capture.
+        let wave_format = WaveFormat::new(
+            32,
+            32,
+            &SampleType::Float,
+            OUTPUT_SAMPLE_RATE as usize,
+            OUTPUT_CHANNELS as usize,
+            None,
+        );
+
+        audio_client
+            .initialize_client(
+                &wave_format,
+                REQUESTED_BUFFER_HNS,
+                &Direction::Capture,
+                &ShareMode::Shared,
+                true,
+            )
+            .map_err(|e| format!("initialize_client (process-loopback): {e:?}"))?;
+
+        let h_event = audio_client
+            .set_get_eventhandle()
+            .map_err(|e| format!("set_get_eventhandle: {e:?}"))?;
+        let capture_client = audio_client
+            .get_audiocaptureclient()
+            .map_err(|e| format!("get_audiocaptureclient: {e:?}"))?;
+
+        audio_client
+            .start_stream()
+            .map_err(|e| format!("start_stream: {e:?}"))?;
+
+        let block_align = wave_format.get_blockalign() as usize;
+
+        while !stop.load(Ordering::Relaxed) {
+            // 100ms timeout lets the loop check the stop flag even when
+            // every excluded session is silent — there's nothing to
+            // render so the event handle never fires.
+            if h_event.wait_for_event(100).is_err() {
+                continue;
+            }
+
+            // Drain all packets available since the last wake — there
+            // can be several queued if we were preempted.
+            loop {
+                if stop.load(Ordering::Relaxed) {
+                    break;
+                }
+                let frames_available = match capture_client.get_next_nbr_frames() {
+                    Ok(Some(n)) if n > 0 => n,
+                    Ok(_) => break,
+                    Err(e) => {
+                        eprintln!(
+                            "audio-loopback {capture_id}: get_next_nbr_frames: {e:?}"
+                        );
+                        break;
+                    }
+                };
+
+                let bytes_needed = frames_available as usize * block_align;
+                let mut raw = vec![0u8; bytes_needed];
+                if let Err(e) = capture_client.read_from_device(&mut raw) {
+                    eprintln!(
+                        "audio-loopback {capture_id}: read_from_device: {e:?}"
+                    );
+                    break;
+                }
+
+                // Reinterpret bytes as f32 little-endian samples. The
+                // buffer is already 48kHz f32 stereo because process-
+                // loopback autoconverted to our requested format. We
+                // copy out into a Vec<f32> so napi can hand ownership
+                // of a JS-owned ArrayBuffer to the renderer.
+                let mut samples = Vec::<f32>::with_capacity(raw.len() / 4);
+                let mut idx = 0;
+                while idx + 4 <= raw.len() {
+                    let bytes = [raw[idx], raw[idx + 1], raw[idx + 2], raw[idx + 3]];
+                    samples.push(f32::from_le_bytes(bytes));
+                    idx += 4;
+                }
+                let _ = (OUTPUT_SAMPLE_RATE, OUTPUT_CHANNELS);
+
+                let payload = Float32Array::new(samples);
+                // NonBlocking: never block the WASAPI capture thread on
+                // a slow JS event loop — at 48kHz stereo a stalled
+                // renderer would otherwise back-pressure the WASAPI
+                // event handle and underrun every other consumer.
+                let status = tsfn.call(payload, ThreadsafeFunctionCallMode::NonBlocking);
+                if status != napi::Status::Ok {
+                    // Renderer went away or the threadsafe function was
+                    // released — stop cleanly.
+                    stop.store(true, Ordering::Relaxed);
+                    break;
+                }
+            }
+        }
+
+        let _ = audio_client.stop_stream();
+        Ok(())
+    }
+}

apps/desktop/native/audio-loopback/target/.rustc_info.json

@@ -0,0 +1 @@
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