feat: autoscroll standard, visualizzazione tag/date e OCR spaziale avanzato

- Aggiunto autoscroll standard con controllo velocità (V1-V10) e relativo toggle in settings.
- Implementata la visualizzazione opzionale di tag e data aggiornamento nella lista canti.
- Rinnovata la pagina 'Proponi Canto' con tastiera accordi (fondamentale + variazioni) e OCR spaziale potenziato per l'allineamento automatico degli accordi con il testo.
- Ottimizzata la persistenza della modalità schermo intero.

src/app/pages/player/player.page.html

@@ -40,6 +40,20 @@
     <!-- Landscape Side Controls (Scrollable) -->
     <div class="landscape-side-controls" [class.active-fullscreen]="settingsService.fullscreenMode()">
       <div class="side-scroll-container">
+        <!-- Autoscroll group in Landscape Side -->
+        <div class="side-group" *ngIf="settingsService.enableStandardAutoscroll()" style="gap: 4px; padding: 4px 0; background: rgba(255,255,255,0.05); border-radius: 12px; border: 1px solid rgba(255,255,255,0.1); width: 44px; margin: 0 auto; display: flex; flex-direction: column; align-items: center; justify-content: center;">
+          <ion-button fill="clear" size="small" (click)="increaseAutoscrollSpeed()" [disabled]="autoscrollSpeed() >= 10" style="height: 32px; margin: 0;">
+            <ion-icon name="add" style="font-size: 1.2rem; color: var(--ion-color-secondary);"></ion-icon>
+          </ion-button>
+          <div (click)="toggleAutoscroll()" style="cursor: pointer; display: flex; flex-direction: column; align-items: center; gap: 2px;">
+            <ion-icon [name]="isAutoscrolling() ? 'pause' : 'play'" [color]="isAutoscrolling() ? 'danger' : 'secondary'" style="font-size: 1.4rem;"></ion-icon>
+            <span style="font-size: 0.65rem; font-weight: 700; color: var(--ion-color-secondary);">V{{ autoscrollSpeed() }}</span>
+          </div>
+          <ion-button fill="clear" size="small" (click)="decreaseAutoscrollSpeed()" [disabled]="autoscrollSpeed() <= 1" style="height: 32px; margin: 0;">
+            <ion-icon name="remove" style="font-size: 1.2rem; color: var(--ion-color-secondary);"></ion-icon>
+          </ion-button>
+        </div>
+
         <div class="side-group equidistant-group">
           <!-- Navigation -->
           <ion-button fill="clear" (click)="restart()">
@@ -61,7 +75,7 @@
           </ion-button>
 
           <!-- Karaoke Toggle (Moved down) -->
-          <ion-button fill="clear" (click)="toggleListening()" [color]="audioEngine.isListening() ? 'danger' : 'secondary'">
+          <ion-button *ngIf="settingsService.enableAcousticAutoscroll()" fill="clear" (click)="toggleListening()" [color]="audioEngine.isListening() ? 'danger' : 'secondary'">
             <ion-icon [name]="audioEngine.isListening() ? 'mic' : 'mic-off'"></ion-icon>
           </ion-button>
           
@@ -141,14 +155,28 @@
   </ion-toolbar>
 
   <!-- Voice Activity Visualizer (Slim overlay) -->
-  <div class="transcript-area slim" *ngIf="audioEngine.isListening()">
+  <div class="transcript-area slim" *ngIf="settingsService.enableAcousticAutoscroll() && audioEngine.isListening()">
     <div class="energy-bar" [style.width.%]="math.min(100, audioEngine.energyLevel() * 3)"></div>
   </div>
 
   <ion-toolbar class="bg-gradient slim-toolbar">
     <div class="slim-controls">
+      <!-- Autoscroll Standard in Portrait Footer -->
+      <div class="group" *ngIf="settingsService.enableStandardAutoscroll()">
+        <ion-button fill="clear" size="small" (click)="decreaseAutoscrollSpeed()" [disabled]="autoscrollSpeed() <= 1">
+          <ion-icon slot="icon-only" name="remove"></ion-icon>
+        </ion-button>
+        <div class="autoscroll-indicator" (click)="toggleAutoscroll()" style="display: flex; align-items: center; gap: 4px; padding: 0 4px; cursor: pointer;">
+          <ion-icon [name]="isAutoscrolling() ? 'pause' : 'play'" [color]="isAutoscrolling() ? 'danger' : 'secondary'"></ion-icon>
+          <span style="font-size: 0.75rem; font-weight: 700; color: var(--ion-color-secondary); min-width: 32px; text-align: center;">V{{ autoscrollSpeed() }}</span>
+        </div>
+        <ion-button fill="clear" size="small" (click)="increaseAutoscrollSpeed()" [disabled]="autoscrollSpeed() >= 10">
+          <ion-icon slot="icon-only" name="add"></ion-icon>
+        </ion-button>
+      </div>
+
       <!-- Karaoke Toggle in Portrait -->
-      <ion-button fill="clear" size="small" (click)="toggleListening()" [color]="audioEngine.isListening() ? 'danger' : 'secondary'" class="mic-btn-portrait">
+      <ion-button *ngIf="settingsService.enableAcousticAutoscroll()" fill="clear" size="small" (click)="toggleListening()" [color]="audioEngine.isListening() ? 'danger' : 'secondary'" class="mic-btn-portrait">
         <ion-icon slot="icon-only" [name]="audioEngine.isListening() ? 'mic' : 'mic-off'"></ion-icon>
       </ion-button>
 
@@ -201,7 +229,7 @@
 </ion-footer>
 
 <!-- Vertical Sensitivity Slider Overlay -->
-<div class="mic-sensitivity-overlay" *ngIf="showSensitivitySlider() && audioEngine.isListening()">
+<div class="mic-sensitivity-overlay" *ngIf="settingsService.enableAcousticAutoscroll() && showSensitivitySlider() && audioEngine.isListening()">
   <div class="slider-card glass">
     <ion-button fill="clear" color="secondary" (click)="toggleSensitivitySlider($event)" class="close-slider-btn">
       <ion-icon name="close-outline"></ion-icon>