feat: Add dialog messages for companion connection and disconnection

- Introduced new dialog messages for connecting to a companion and handling disconnection across multiple languages.
- Updated localization files for French, Hungarian, Italian, Japanese, Korean, Bulgarian, German, English, Spanish, Dutch, Polish, Portuguese, Russian, Slovak, Slovenian, Swedish, Ukrainian, and Chinese.
- Modified the contacts and map screens to utilize the new dialog messages.
- Enhanced the disconnect confirmation dialog to show a message upon successful disconnection.
- Updated app bar to conditionally display radio stats based on companion connection status.

lib/utils/dialog_utils.dart

@@ -31,6 +31,21 @@ Future<bool> showDisconnectDialog(
   if (confirmed == true) {
     appLogger.info('Disconnect confirmed from popup', tag: 'Connection');
     await connector.disconnect();
+    if (context.mounted) {
+      await showDialog<void>(
+        context: context,
+        builder: (context) => AlertDialog(
+          title: Text(context.l10n.dialog_disconnectedTitle),
+          content: Text(context.l10n.dialog_disconnectedMessage),
+          actions: [
+            TextButton(
+              onPressed: () => Navigator.pop(context),
+              child: Text(context.l10n.common_ok),
+            ),
+          ],
+        ),
+      );
+    }
     return true;
   }
   return false;