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/widgets/section_header.dart

@@ -0,0 +1,35 @@
+import 'package:flutter/material.dart';
+import '../../app/theme/app_colors.dart';
+
+/// Reusable uppercase section label (e.g. "NOTIFICATIONS", "DISPLAY").
+/// Uses sage color, tracking-wider, bold weight per PRD §3.2 labelSmall.
+class SectionHeader extends StatelessWidget {
+  const SectionHeader({
+    super.key,
+    required this.title,
+    this.trailing,
+  });
+
+  final String title;
+  final Widget? trailing;
+
+  @override
+  Widget build(BuildContext context) {
+    return Padding(
+      padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
+      child: Row(
+        mainAxisAlignment: MainAxisAlignment.spaceBetween,
+        children: [
+          Text(
+            title.toUpperCase(),
+            style: Theme.of(context).textTheme.labelSmall?.copyWith(
+                  color: AppColors.sage,
+                  letterSpacing: 1.5,
+                ),
+          ),
+          if (trailing != null) trailing!,
+        ],
+      ),
+    );
+  }
+}