Perbarui tema dan styling dashboard dengan komponen kustom

- Tambahkan tema aplikasi di AppTheme
- Ganti font default dengan DM Sans dari aset
- Buat komponen kustom seperti StatisticCard, NavigationButton, dan StatusPill
- Perbarui desain drawer, bottom navigation, dan elemen dashboard
- Gunakan gradient dan warna tema yang konsisten
- Sederhanakan struktur kode dan styling

lib/app/widgets/statistic_card.dart

@@ -0,0 +1,61 @@
+import 'package:flutter/material.dart';
+import '../theme/app_theme.dart';
+
+class StatisticCard extends StatelessWidget {
+  final String title;
+  final String count;
+  final String subtitle;
+  final double height;
+
+  const StatisticCard({
+    Key? key,
+    required this.title,
+    required this.count,
+    required this.subtitle,
+    required this.height,
+  }) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    final textTheme = Theme.of(context).textTheme;
+
+    return Container(
+      width: double.infinity,
+      height: height,
+      padding: const EdgeInsets.all(12),
+      decoration: BoxDecoration(
+        gradient: AppTheme.primaryGradient,
+        borderRadius: BorderRadius.circular(12),
+      ),
+      child: Column(
+        crossAxisAlignment: CrossAxisAlignment.start,
+        children: [
+          Text(
+            title,
+            style: textTheme.bodyMedium?.copyWith(
+              fontSize: 14,
+              color: Colors.white.withAlpha(204), // 0.8 * 255 ≈ 204
+            ),
+          ),
+          const SizedBox(height: 4),
+          Text(
+            count,
+            style: textTheme.headlineSmall?.copyWith(
+              fontSize: 24,
+              fontWeight: FontWeight.bold,
+              color: Colors.white,
+            ),
+          ),
+          const SizedBox(height: 4),
+          Text(
+            subtitle,
+            style: textTheme.bodySmall?.copyWith(
+              fontSize: 12,
+              color: Colors.white,
+            ),
+          ),
+        ],
+      ),
+    );
+  }
+}