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>

packages/shared/src/friends/index.ts

@@ -6,6 +6,7 @@ export interface ProfileBrief {
   username: string;
   displayName: string;
   avatarUrl: string | null;
+  bannerUrl: string | null;
 }
 
 export type FriendDirection = 'outgoing' | 'incoming';
@@ -19,19 +20,21 @@ export interface Friendship {
   acceptedAt: string | null;
 }
 
-const PROFILE_BRIEF_COLS = 'user_id, username, display_name, avatar_url';
+const PROFILE_BRIEF_COLS = 'user_id, username, display_name, avatar_url, banner_url';
 
 function mapProfileBrief(row: {
   user_id: string;
   username: string;
   display_name: string;
   avatar_url: string | null;
+  banner_url: string | null;
 }): ProfileBrief {
   return {
     userId: row.user_id,
     username: row.username,
     displayName: row.display_name,
     avatarUrl: row.avatar_url,
+    bannerUrl: row.banner_url,
   };
 }
 
@@ -106,6 +109,7 @@ export async function listFriendships(client: AppSupabaseClient): Promise<Friend
       username: '?',
       displayName: '?',
       avatarUrl: null,
+      bannerUrl: null,
     };
     return {
       peer,