feat(desktop): port v0.11.4-v0.15.2 from Tauri to Electron + Discord-parity audio (v0.16.0)

Chronological port of every Tauri release commit (v0.11.4 -> v0.15.2)
into the Electron rebuild, plus Discord-style audio handling that goes
beyond the Tauri original.

Highlights:
  - All 17 Tauri release commits ported (audio fixes, custom notification
    sound, Discord-style chat UX, profile banner, changelog page,
    Discord-parity call UX, screen-share echo + re-watch UX, audio-loop
    fix).
  - Native napi-rs audio-loopback addon with WASAPI process-loopback:
      * EXCLUDE_TARGET_PROCESS_TREE for full-screen shares -> peers
        never hear themselves echoed back through the capture.
      * INCLUDE_TARGET_PROCESS_TREE for window shares -> only the
        picked window's audio is captured, not the whole OS mixer
        (Discord parity).
      * HWND -> PID resolution via Win32 GetWindowThreadProcessId.
  - Discord-style screen-source picker (thumbnail grid, screens vs
    apps tabs, live-refreshing thumbnails).
  - Hash routing fix for packaged builds (file:// can't resolve
    BrowserRouter paths).
  - Tauri sources removed (apps/desktop/src-tauri).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/desktop/electron.vite.config.ts

@@ -0,0 +1,90 @@
+// 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';
+
+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: './',
+    plugins: [react()],
+    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,
+  },
+});