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/core/providers/placeholder.dart

@@ -0,0 +1 @@
+// TODO: implement

lib/core/providers/theme_provider.dart

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+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:hive_flutter/hive_flutter.dart';
+import '../../data/local/hive_boxes.dart';
+import '../../data/local/models/app_settings.dart';
+
+/// Theme mode state provider.
+final themeProvider = StateProvider<ThemeMode>((ref) {
+  final box = Hive.box<AppSettings>(HiveBoxes.settings);
+  final settings = box.get('default');
+  return settings?.themeModeIndex == 1 ? ThemeMode.light : ThemeMode.dark;
+});

lib/core/providers/tilawah_tracking_provider.dart

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+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+/// Models an active reading session for Tilawah
+class TilawahSession {
+  final int startSurahId;
+  final String startSurahName;
+  final int startVerseId;
+
+  const TilawahSession({
+    required this.startSurahId,
+    required this.startSurahName,
+    required this.startVerseId,
+  });
+
+  TilawahSession copyWith({
+    int? startSurahId,
+    String? startSurahName,
+    int? startVerseId,
+  }) {
+    return TilawahSession(
+      startSurahId: startSurahId ?? this.startSurahId,
+      startSurahName: startSurahName ?? this.startSurahName,
+      startVerseId: startVerseId ?? this.startVerseId,
+    );
+  }
+}
+
+/// A state notifier to manage the global start state of a reading session.
+/// If state is null, no active tracking is occurring.
+class TilawahTrackingNotifier extends StateNotifier<TilawahSession?> {
+  TilawahTrackingNotifier() : super(null);
+
+  /// Start a new tracking session
+  void startTracking({
+    required int surahId, 
+    required String surahName, 
+    required int verseId
+  }) {
+    state = TilawahSession(
+      startSurahId: surahId,
+      startSurahName: surahName,
+      startVerseId: verseId,
+    );
+  }
+
+  /// Stop tracking (after recording)
+  void stopTracking() {
+    state = null;
+  }
+}
+
+final tilawahTrackingProvider = StateNotifierProvider<TilawahTrackingNotifier, TilawahSession?>((ref) {
+  return TilawahTrackingNotifier();
+});