feat: show instructions when playlist is empty & fix high contrast contrast

src/app/services/settings.service.ts

@@ -56,6 +56,12 @@ export class SettingsService {
   /** Identificativo utente univoco per la gestione delle comunità */
   public userUuid = signal<string>('');
 
+  /** Identificativo originario assegnato alla prima installazione */
+  public originalUserUuid = signal<string>('');
+
+  /** Nome associato all'identità utente */
+  public userName = signal<string>('');
+
   private wakeLock: any = null;
 
   // PWA installation signals
@@ -83,6 +89,19 @@ export class SettingsService {
     }
     this.userUuid.set(savedUuid);
 
+    // Salvataggio dell'ID originario (alla prima installazione) se non è già presente
+    let originalUuid = localStorage.getItem('original-user-uuid');
+    if (!originalUuid) {
+      originalUuid = savedUuid;
+      localStorage.setItem('original-user-uuid', originalUuid);
+    }
+    this.originalUserUuid.set(originalUuid);
+
+    const savedName = localStorage.getItem('user-name');
+    if (savedName) {
+      this.userName.set(savedName);
+    }
+
     // Detect PWA status
     try {
       this.isStandalone.set(
@@ -166,12 +185,8 @@ export class SettingsService {
       this.autoAdvance.set(true);
     }
 
-    const savedKeepScreenOn = localStorage.getItem('keep-screen-on');
-    if (savedKeepScreenOn !== null) {
-      this.keepScreenOn.set(savedKeepScreenOn === 'true');
-    } else {
-      this.keepScreenOn.set(true);
-    }
+    // Keep screen always on by default and always active
+    this.keepScreenOn.set(true);
 
     const savedComunitaEnabled = localStorage.getItem('comunita-enabled');
     if (savedComunitaEnabled !== null) {
@@ -318,9 +333,6 @@ export class SettingsService {
     localStorage.setItem('show-editor', newValue.toString());
   }
 
-  toggleKeepScreenOn() {
-    this.keepScreenOn.update(v => !v);
-  }
 
   toggleComunitaEnabled() {
     const newValue = !this.comunitaEnabled();
@@ -426,6 +438,12 @@ export class SettingsService {
     }
   }
 
+  setUserName(name: string) {
+    const trimmed = name.trim();
+    this.userName.set(trimmed);
+    localStorage.setItem('user-name', trimmed);
+  }
+
   async installPwa() {
     const promptEvent = this.deferredPrompt();
     if (!promptEvent) {