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/theme/app_text_styles.dart

@@ -0,0 +1,70 @@
+import 'package:flutter/material.dart';
+
+/// Typography definitions from PRD §3.2.
+/// Plus Jakarta Sans (bundled) for UI text, Amiri (bundled) for Arabic content.
+class AppTextStyles {
+  AppTextStyles._();
+
+  static const String _fontFamily = 'PlusJakartaSans';
+
+  /// Builds the full TextTheme for the app using bundled Plus Jakarta Sans.
+  static const TextTheme textTheme = TextTheme(
+    displayLarge: TextStyle(
+      fontFamily: _fontFamily,
+      fontSize: 32,
+      fontWeight: FontWeight.w800,
+    ),
+    headlineMedium: TextStyle(
+      fontFamily: _fontFamily,
+      fontSize: 24,
+      fontWeight: FontWeight.w700,
+    ),
+    titleLarge: TextStyle(
+      fontFamily: _fontFamily,
+      fontSize: 20,
+      fontWeight: FontWeight.w700,
+    ),
+    titleMedium: TextStyle(
+      fontFamily: _fontFamily,
+      fontSize: 16,
+      fontWeight: FontWeight.w600,
+    ),
+    bodyLarge: TextStyle(
+      fontFamily: _fontFamily,
+      fontSize: 16,
+      fontWeight: FontWeight.w400,
+    ),
+    bodyMedium: TextStyle(
+      fontFamily: _fontFamily,
+      fontSize: 14,
+      fontWeight: FontWeight.w400,
+    ),
+    bodySmall: TextStyle(
+      fontFamily: _fontFamily,
+      fontSize: 12,
+      fontWeight: FontWeight.w400,
+    ),
+    labelSmall: TextStyle(
+      fontFamily: _fontFamily,
+      fontSize: 10,
+      fontWeight: FontWeight.w700,
+      letterSpacing: 1.5,
+    ),
+  );
+
+  // ── Arabic text styles (Amiri — bundled font) ──
+
+  static const TextStyle arabicBody = TextStyle(
+    fontFamily: 'Amiri',
+    fontSize: 24,
+    fontWeight: FontWeight.w400,
+    height: 2.0,
+  );
+
+  static const TextStyle arabicLarge = TextStyle(
+    fontFamily: 'Amiri',
+    fontSize: 28,
+    fontWeight: FontWeight.w700,
+    height: 2.2,
+  );
+}