refactor: zoom a livello di dispositivo e rimozione zoom da playlist

src/app/pages/player/player.page.ts

@@ -313,13 +313,9 @@ export class PlayerPage implements OnInit, AfterViewInit, OnDestroy {
       if (playlistSongSetting) {
         this.transposeAmount.set(playlistSongSetting.tonalita !== undefined ? playlistSongSetting.tonalita : 0);
         this.autoscrollSpeed.set(playlistSongSetting.speed !== undefined ? playlistSongSetting.speed : 2);
-        if (playlistSongSetting.zoom !== undefined) {
-          this.fontSize.set(playlistSongSetting.zoom);
-          this.portraitFontSize = playlistSongSetting.zoom;
-        } else {
-          this.fontSize.set(1.0);
-          this.portraitFontSize = 1.0;
-        }
+        const gZoom = this.settingsService.globalZoom();
+        this.fontSize.set(gZoom);
+        this.portraitFontSize = gZoom;
       } else if (this.comunitaService.comunitaCode() && this.comunitaService.isFilterActive()) {
         const settings = this.comunitaService.comunitaCantiSettings();
         const songSetting = settings.find(s => s.id_canti === c.id_canti || s.id_canti === Number(c.id));
@@ -339,13 +335,15 @@ export class PlayerPage implements OnInit, AfterViewInit, OnDestroy {
           this.transposeAmount.set(0);
           this.autoscrollSpeed.set(2);
         }
-        this.fontSize.set(1.0);
-        this.portraitFontSize = 1.0;
+        const gZoom = this.settingsService.globalZoom();
+        this.fontSize.set(gZoom);
+        this.portraitFontSize = gZoom;
       } else {
         this.transposeAmount.set(0);
         this.autoscrollSpeed.set(2);
-        this.fontSize.set(1.0);
-        this.portraitFontSize = 1.0;
+        const gZoom = this.settingsService.globalZoom();
+        this.fontSize.set(gZoom);
+        this.portraitFontSize = gZoom;
       }
     }, { allowSignalWrites: true });
 
@@ -577,6 +575,7 @@ export class PlayerPage implements OnInit, AfterViewInit, OnDestroy {
         this.fontSize.set(limited);
         if (!this.isLandscape()) {
           this.portraitFontSize = limited;
+          this.settingsService.globalZoom.set(limited);
         }
         this.channel.postMessage({ type: 'SYNC_FONT', fontSize: this.fontSize() });
       }
@@ -615,8 +614,7 @@ export class PlayerPage implements OnInit, AfterViewInit, OnDestroy {
           activePlaylistId, 
           c.id, 
           this.transposeAmount(), 
-          this.autoscrollSpeed(),
-          this.fontSize()
+          this.autoscrollSpeed()
         );
       }
     }
@@ -644,6 +642,7 @@ export class PlayerPage implements OnInit, AfterViewInit, OnDestroy {
         this.fontSize.set(limited);
         if (!this.isLandscape()) {
           this.portraitFontSize = limited;
+          this.settingsService.globalZoom.set(limited);
         }
         this.channel.postMessage({ type: 'SYNC_FONT', fontSize: this.fontSize() });
         this.updatePlaylistSettings();
@@ -658,6 +657,7 @@ export class PlayerPage implements OnInit, AfterViewInit, OnDestroy {
       this.fontSize.set(target);
       if (!this.isLandscape()) {
         this.portraitFontSize = target;
+        this.settingsService.globalZoom.set(target);
       }
       this.channel.postMessage({ type: 'SYNC_FONT', fontSize: this.fontSize() });
       this.updatePlaylistSettings();

src/app/services/playlist.service.ts

@@ -401,15 +401,14 @@ export class PlaylistService {
     this.syncLocalDataToServer();
   }
 
-  async updatePlaylistSongSettings(playlistId: string, songId: string, tonalita: number, speed: number, zoom?: number) {
+  async updatePlaylistSongSettings(playlistId: string, songId: string, tonalita: number, speed: number) {
     await this.initPromise;
     this.playlists.update(p => p.map(pl => {
       if (pl.id === playlistId) {
         const songSettings = { ...(pl.songSettings || {}) };
         songSettings[songId] = { 
           tonalita, 
-          speed,
-          zoom: zoom !== undefined ? zoom : songSettings[songId]?.zoom
+          speed
         };
         return { ...pl, songSettings };
       }

src/app/services/settings.service.ts

@@ -59,6 +59,9 @@ export class SettingsService {
   /** Schermo nero per l'ascolto delle playlist in macchina: true = attivo */
   public carModeBlackScreen = signal<boolean>(false);
 
+  /** Global zoom/font size factor for song presentation */
+  public globalZoom = signal<number>(1.0);
+
   /** Identificativo utente univoco per la gestione delle comunità */
   public userUuid = signal<string>('');
 
@@ -264,6 +267,14 @@ export class SettingsService {
       this.carModeBlackScreen.set(false);
     }
 
+    const savedGlobalZoom = localStorage.getItem('global-zoom');
+    if (savedGlobalZoom !== null) {
+      const parsed = parseFloat(savedGlobalZoom);
+      this.globalZoom.set(isNaN(parsed) ? 1.0 : parsed);
+    } else {
+      this.globalZoom.set(1.0);
+    }
+
     // Sync browser fullscreen state with listeners (supporting vendor prefixes)
     const updateFullscreenState = () => {
       const isFs = !!(
@@ -325,6 +336,10 @@ export class SettingsService {
       localStorage.setItem('car-mode-black-screen', this.carModeBlackScreen().toString());
     });
 
+    effect(() => {
+      localStorage.setItem('global-zoom', this.globalZoom().toString());
+    });
+
     effect(() => {
       const active = this.keepScreenOn();
       localStorage.setItem('keep-screen-on', active.toString());

src/app/version.ts

@@ -1 +1 @@
-export const VERSION = '2026.07.13.1915';
+export const VERSION = '2026.07.13.1941';