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/components/ScreenShareContextMenu.tsx

@@ -8,7 +8,7 @@ import {
   setScreenShareVolume,
   subscribeScreenShareVolumes,
 } from '../lib/screenShareVolumes';
-import { HeadphonesIcon, HeadphonesOffIcon, MonitorShareIcon, PhoneOffIcon } from './icons';
+import { EyeOffIcon, HeadphonesIcon, HeadphonesOffIcon, MonitorShareIcon, PhoneOffIcon } from './icons';
 
 interface Props {
   /** Participant whose screen share the user right-clicked. */
@@ -23,8 +23,9 @@ interface Props {
 }
 
 const MENU_W = 260;
-const MENU_H_WITH_AUDIO = 200;
-const MENU_H_NO_AUDIO = 96;
+// Heights bumped to fit the new "Tile ausblenden" row (38px each).
+const MENU_H_WITH_AUDIO = 240;
+const MENU_H_NO_AUDIO = 134;
 
 // Context menu surfaced on right-click of a remote screen share. Mirrors
 // Discord's stream menu: volume slider, audio mute toggle (independent of
@@ -41,9 +42,12 @@ export function ScreenShareContextMenu({
   const { t } = useTranslation(['app']);
   const {
     dismissShare,
+    stopWatchingShare,
+    watchingShareUserIds,
     screenShareAudioMutedIds,
     setScreenShareAudioMuted,
   } = useCall();
+  const watching = watchingShareUserIds.has(userId);
   const [volume, setVolume] = useState<number>(() => getScreenShareVolume(userId));
 
   useEffect(
@@ -151,6 +155,25 @@ export function ScreenShareContextMenu({
         </>
       )}
 
+      {/* Discord-parity: "Stop watching" only ends the local subscription;
+          the tile stays so the user can re-click to watch again. The full
+          dismiss path (kill the tile until the sharer restarts) is the
+          second row below. */}
+      {watching && (
+        <button
+          type="button"
+          onClick={() => {
+            stopWatchingShare(userId);
+            onClose();
+          }}
+          className="flex w-full cursor-pointer items-center gap-2 border-t border-line px-3 py-2 text-left text-xs text-fg transition hover:bg-surface-3"
+        >
+          <PhoneOffIcon className="h-4 w-4 text-fg-muted" />
+          <span>
+            {t('app:call.stop_watching', { defaultValue: 'Zuschauen beenden' })}
+          </span>
+        </button>
+      )}
       <button
         type="button"
         onClick={() => {
@@ -159,9 +182,9 @@ export function ScreenShareContextMenu({
         }}
         className="flex w-full cursor-pointer items-center gap-2 border-t border-line px-3 py-2 text-left text-xs font-semibold text-rose-600 transition hover:bg-rose-500/10 dark:text-rose-300"
       >
-        <PhoneOffIcon className="h-4 w-4" />
+        <EyeOffIcon className="h-4 w-4" />
         <span>
-          {t('app:call.stop_watching', { defaultValue: 'Zuschauen beenden' })}
+          {t('app:call.dismiss_tile', { defaultValue: 'Stream-Tile ausblenden' })}
         </span>
       </button>
     </div>,