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/src/lib/voiceHotkeys.ts

@@ -25,6 +25,12 @@ export interface VoiceHotkeyBinding {
 export interface VoiceHotkeys {
   mute: VoiceHotkeyBinding;
   deafen: VoiceHotkeyBinding;
+  /** Hang up the active call. Discord uses no default — easy to mis-fire. */
+  hangup: VoiceHotkeyBinding;
+  /** Toggle outgoing screen share. */
+  screenShare: VoiceHotkeyBinding;
+  /** Toggle outgoing camera. */
+  video: VoiceHotkeyBinding;
 }
 
 export type VoiceHotkeyKind = keyof VoiceHotkeys;
@@ -46,6 +52,30 @@ const DEFAULTS: VoiceHotkeys = {
     alt: false,
     enabled: false,
   },
+  hangup: {
+    key: 'KeyH',
+    keyLabel: 'Ctrl+Shift+H',
+    ctrl: true,
+    shift: true,
+    alt: false,
+    enabled: false,
+  },
+  screenShare: {
+    key: 'KeyE',
+    keyLabel: 'Ctrl+Shift+E',
+    ctrl: true,
+    shift: true,
+    alt: false,
+    enabled: false,
+  },
+  video: {
+    key: 'KeyV',
+    keyLabel: 'Ctrl+Shift+V',
+    ctrl: true,
+    shift: true,
+    alt: false,
+    enabled: false,
+  },
 };
 
 type Listener = (s: VoiceHotkeys) => void;
@@ -78,6 +108,9 @@ function read(): VoiceHotkeys {
     cached = {
       mute: validateBinding(parsed.mute, DEFAULTS.mute),
       deafen: validateBinding(parsed.deafen, DEFAULTS.deafen),
+      hangup: validateBinding(parsed.hangup, DEFAULTS.hangup),
+      screenShare: validateBinding(parsed.screenShare, DEFAULTS.screenShare),
+      video: validateBinding(parsed.video, DEFAULTS.video),
     };
     return cached;
   } catch {