fix: Windows audio mute fix

toju-app/src/app/infrastructure/realtime/media/screen-share-platforms/desktop-electron-screen-share.capture.ts

@@ -49,9 +49,19 @@ export class DesktopElectronScreenShareCapture {
 
     const sources = await electronApi.getSources();
     const selection = await this.resolveSourceSelection(sources, options.includeSystemAudio);
+
+    // On Windows, electron-desktop loopback audio captures all system output
+    // including the app's voice playback, creating echo for watchers or
+    // requiring total voice muting for the sharer. The getDisplayMedia path
+    // handles this correctly via restrictOwnAudio — if we fell back here,
+    // share video only so voice chat stays functional.
+    const effectiveIncludeSystemAudio = this.isWindowsElectron()
+      ? false
+      : selection.includeSystemAudio;
+
     const captureOptions = {
       ...options,
-      includeSystemAudio: selection.includeSystemAudio
+      includeSystemAudio: effectiveIncludeSystemAudio
     };
 
     if (!selection.source) {
@@ -59,7 +69,7 @@ export class DesktopElectronScreenShareCapture {
     }
 
     this.logger.info('Selected Electron desktop source', {
-      includeSystemAudio: selection.includeSystemAudio,
+      includeSystemAudio: effectiveIncludeSystemAudio,
       sourceId: selection.source.id,
       sourceName: selection.source.name
     });
@@ -73,7 +83,7 @@ export class DesktopElectronScreenShareCapture {
     }
 
     return {
-      includeSystemAudio: selection.includeSystemAudio,
+      includeSystemAudio: effectiveIncludeSystemAudio,
       stream: await navigator.mediaDevices.getUserMedia(constraints)
     };
   }