feat: Murattal player enhancements & prayer schedule auto-scroll

- Murattal: Spotify-style 5-button controls [Shuffle, Prev, Play, Next, Playlist]
- Murattal: Animated 7-bar equalizer visualization in player circle
- Murattal: Unsplash API background with frosted glass player overlay
- Murattal: Transparent AppBar with backdrop blur
- Murattal: Surah playlist bottom sheet with full 114 Surah list
- Murattal: Auto-play disabled on screen open, enabled on navigation
- Murattal: Shuffle mode for random Surah playback
- Murattal: Photographer attribution per Unsplash guidelines
- Dashboard: Auto-scroll prayer schedule to next active prayer
- Fix: setState lifecycle errors on Reading & Murattal screens
- Setup: flutter_dotenv, cached_network_image, url_launcher deps

lib/data/services/notification_service.dart

@@ -0,0 +1,98 @@
+import 'package:flutter_local_notifications/flutter_local_notifications.dart';
+import 'package:timezone/timezone.dart' as tz;
+
+/// Notification service for Adhan and Iqamah notifications.
+class NotificationService {
+  NotificationService._();
+  static final NotificationService instance = NotificationService._();
+
+  final FlutterLocalNotificationsPlugin _plugin =
+      FlutterLocalNotificationsPlugin();
+
+  bool _initialized = false;
+
+  /// Initialize notification channels.
+  Future<void> init() async {
+    if (_initialized) return;
+
+    const androidSettings = AndroidInitializationSettings('@mipmap/ic_launcher');
+    const darwinSettings = DarwinInitializationSettings(
+      requestAlertPermission: true,
+      requestBadgePermission: true,
+      requestSoundPermission: true,
+    );
+
+    const settings = InitializationSettings(
+      android: androidSettings,
+      iOS: darwinSettings,
+      macOS: darwinSettings,
+    );
+
+    await _plugin.initialize(settings);
+    _initialized = true;
+  }
+
+  /// Schedule an Adhan notification at a specific time.
+  Future<void> scheduleAdhan({
+    required int id,
+    required String prayerName,
+    required DateTime time,
+  }) async {
+    await _plugin.zonedSchedule(
+      id,
+      'Adhan - $prayerName',
+      'It\'s time for $prayerName prayer',
+      tz.TZDateTime.from(time, tz.local),
+      const NotificationDetails(
+        android: AndroidNotificationDetails(
+          'adhan_channel',
+          'Adhan Notifications',
+          channelDescription: 'Prayer time adhan notifications',
+          importance: Importance.high,
+          priority: Priority.high,
+        ),
+        iOS: DarwinNotificationDetails(
+          presentAlert: true,
+          presentBadge: true,
+          presentSound: true,
+        ),
+      ),
+      androidScheduleMode: AndroidScheduleMode.exactAllowWhileIdle,
+    );
+  }
+
+  /// Schedule an Iqamah reminder notification.
+  Future<void> scheduleIqamah({
+    required int id,
+    required String prayerName,
+    required DateTime adhanTime,
+    required int offsetMinutes,
+  }) async {
+    final iqamahTime = adhanTime.add(Duration(minutes: offsetMinutes));
+    await _plugin.zonedSchedule(
+      id + 100, // Offset IDs for iqamah
+      'Iqamah - $prayerName',
+      'Iqamah for $prayerName in $offsetMinutes minutes',
+      tz.TZDateTime.from(iqamahTime, tz.local),
+      const NotificationDetails(
+        android: AndroidNotificationDetails(
+          'iqamah_channel',
+          'Iqamah Reminders',
+          channelDescription: 'Iqamah reminder notifications',
+          importance: Importance.defaultImportance,
+          priority: Priority.defaultPriority,
+        ),
+        iOS: DarwinNotificationDetails(
+          presentAlert: true,
+          presentSound: true,
+        ),
+      ),
+      androidScheduleMode: AndroidScheduleMode.exactAllowWhileIdle,
+    );
+  }
+
+  /// Cancel all pending notifications.
+  Future<void> cancelAll() async {
+    await _plugin.cancelAll();
+  }
+}