chore: Fix app

toju-app/src/app/domains/direct-call/application/services/direct-call.service.ts

@@ -91,6 +91,8 @@ export class DirectCallService {
         && this.hasConnectedParticipant(session)) ?? null;
   });
   readonly currentSession = signal<DirectCallSession | null>(null);
+  /** User-facing reason the last joinCall attempt failed; null after a successful join. */
+  readonly joinError = signal<string | null>(null);
   readonly hasActiveCall = computed(() => this.visibleActiveSessions().length > 0);
   readonly mobileOverlaySession = computed(() => {
     const callId = this.mobileOverlayCallId();
@@ -333,6 +335,7 @@ export class DirectCallService {
       return;
     }
 
+    this.joinError.set(null);
     this.leaveOtherJoinedCalls(callId);
     this.leaveCurrentVoiceTargetForCall(callId);
     this.audio.stop(AppSound.Call);
@@ -344,22 +347,36 @@ export class DirectCallService {
 
     const ok = await this.voice.ensureSignalingConnected();
 
-    if (!ok || !navigator.mediaDevices?.getUserMedia) {
+    if (!ok) {
+      this.joinError.set(this.i18n.instant('call.errors.signalingUnavailable'));
+      return;
+    }
+
+    if (!navigator.mediaDevices?.getUserMedia) {
+      this.joinError.set(this.i18n.instant('call.errors.captureUnsupported'));
       return;
     }
 
     const voicePermissionsGranted = await this.mobileMedia.ensureVoiceCapturePermissions();
 
     if (!voicePermissionsGranted) {
+      this.joinError.set(this.i18n.instant('call.errors.microphonePermissionDenied'));
       return;
     }
 
-    const stream = await navigator.mediaDevices.getUserMedia({
-      audio: {
-        echoCancellation: true,
-        noiseSuppression: false
-      }
-    });
+    let stream: MediaStream;
+
+    try {
+      stream = await navigator.mediaDevices.getUserMedia({
+        audio: {
+          echoCancellation: true,
+          noiseSuppression: false
+        }
+      });
+    } catch {
+      this.joinError.set(this.i18n.instant('call.errors.microphoneUnavailable'));
+      return;
+    }
 
     await this.voice.setLocalStream(stream);
     this.voiceActivity.trackLocalMic(meId, stream);