Fix PWA redirect loop and installation options after uninstalling PWA

src/app/services/settings.service.ts

@@ -54,7 +54,7 @@ export class SettingsService {
   public karaokePageScrollMode = signal<boolean>(false);
 
   /** Vista orizzontale per proiezione: true = attiva layout landscape per proiezione */
-  public landscapeProjectionEnabled = signal<boolean>(true);
+  public landscapeProjectionEnabled = signal<boolean>(false);
 
   /** Identificativo utente univoco per la gestione delle comunità */
   public userUuid = signal<string>('');
@@ -251,7 +251,7 @@ export class SettingsService {
     if (savedLandscapeProjectionEnabled !== null) {
       this.landscapeProjectionEnabled.set(savedLandscapeProjectionEnabled === 'true');
     } else {
-      this.landscapeProjectionEnabled.set(true);
+      this.landscapeProjectionEnabled.set(false);
     }
 
     // Sync browser fullscreen state with listeners (supporting vendor prefixes)
@@ -464,10 +464,10 @@ export class SettingsService {
     localStorage.setItem('user-name', trimmed);
   }
 
-  async installPwa() {
+  async installPwa(): Promise<string | undefined> {
     const promptEvent = this.deferredPrompt();
     if (!promptEvent) {
-      return;
+      return undefined;
     }
     // Show the install prompt
     promptEvent.prompt();
@@ -477,5 +477,6 @@ export class SettingsService {
     // We've used the prompt, and can't use it again, discard it
     this.deferredPrompt.set(null);
     this.showInstallButton.set(false);
+    return outcome;
   }
 }