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/local/models/cached_prayer_times.dart

@@ -0,0 +1,50 @@
+import 'package:hive_flutter/hive_flutter.dart';
+
+part 'cached_prayer_times.g.dart';
+
+/// Cached prayer times for a specific location + date.
+@HiveType(typeId: 5)
+class CachedPrayerTimes extends HiveObject {
+  @HiveField(0)
+  String key; // 'lat_lng_yyyy-MM-dd'
+
+  @HiveField(1)
+  double lat;
+
+  @HiveField(2)
+  double lng;
+
+  @HiveField(3)
+  String date;
+
+  @HiveField(4)
+  DateTime fajr;
+
+  @HiveField(5)
+  DateTime sunrise;
+
+  @HiveField(6)
+  DateTime dhuhr;
+
+  @HiveField(7)
+  DateTime asr;
+
+  @HiveField(8)
+  DateTime maghrib;
+
+  @HiveField(9)
+  DateTime isha;
+
+  CachedPrayerTimes({
+    required this.key,
+    required this.lat,
+    required this.lng,
+    required this.date,
+    required this.fajr,
+    required this.sunrise,
+    required this.dhuhr,
+    required this.asr,
+    required this.maghrib,
+    required this.isha,
+  });
+}