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/app/app.dart

@@ -0,0 +1,25 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+import '../core/providers/theme_provider.dart';
+import 'router.dart';
+import 'theme/app_theme.dart';
+
+/// Root MaterialApp.router wired to GoRouter + ThemeMode from Riverpod.
+class App extends ConsumerWidget {
+  const App({super.key});
+
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    final themeMode = ref.watch(themeProvider);
+
+    return MaterialApp.router(
+      title: 'Jamshalat Diary',
+      debugShowCheckedModeBanner: false,
+      theme: AppTheme.light,
+      darkTheme: AppTheme.dark,
+      themeMode: themeMode,
+      routerConfig: appRouter,
+    );
+  }
+}