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/avatarUpload.ts

@@ -48,6 +48,13 @@ export async function uploadAvatar(userId: string, file: File): Promise<string>
     throw new Error('only image files are accepted');
   }
   const blob = await resizeToSquare(file);
+  return uploadAvatarBlob(userId, blob);
+}
+
+// Upload an already-cropped Blob (e.g. from ImageCropDialog) without going
+// through the legacy center-crop. Caller is responsible for sizing — the
+// dialog already clamps to MAX_DIM via its outputWidth.
+export async function uploadAvatarBlob(userId: string, blob: Blob): Promise<string> {
   const ext = blob.type === 'image/webp' ? 'webp' : 'jpg';
   // Random filename so old uploads don't get overwritten before we update
   // the profile row — Supabase Storage CDN caches by URL, so a fresh path
@@ -64,6 +71,8 @@ export async function uploadAvatar(userId: string, file: File): Promise<string>
   return pub.publicUrl;
 }
 
+export const AVATAR_TARGET_DIM = MAX_DIM;
+
 export async function deleteAvatarObject(publicUrl: string): Promise<void> {
   // Public URLs look like
   //   https://<host>/storage/v1/object/public/profile-avatars/<path>