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/useMessageReactions.ts

@@ -18,6 +18,7 @@ export interface AggregatedReaction {
 export interface UseMessageReactionsResult {
   byMessage: Map<string, AggregatedReaction[]>;
   toggle: (messageId: string, emoji: string) => Promise<void>;
+  voteExclusive: (messageId: string, emoji: string, exclusiveEmojis: string[]) => Promise<void>;
 }
 
 // Batch-fetches reactions for the given message ids + subscribes to the
@@ -106,5 +107,27 @@ export function useMessageReactions(
     [byMessage, myId, refresh],
   );
 
-  return { byMessage, toggle };
+  const voteExclusive = useCallback(
+    async (messageId: string, emoji: string, exclusiveEmojis: string[]) => {
+      if (!myId) return;
+      const allowed = new Set(exclusiveEmojis);
+      const current = (byMessage.get(messageId) ?? []).filter((reaction) =>
+        allowed.has(reaction.emoji),
+      );
+      const selectedMine = current.some((reaction) => reaction.emoji === emoji && reaction.mine);
+
+      for (const reaction of current) {
+        if (reaction.mine) {
+          await removeReaction(supabase, messageId, reaction.emoji);
+        }
+      }
+      if (!selectedMine) {
+        await addReaction(supabase, messageId, emoji);
+      }
+      await refresh();
+    },
+    [byMessage, myId, refresh],
+  );
+
+  return { byMessage, toggle, voteExclusive };
 }