init cc

lib/shared/widgets/custom_app_bar.dart

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+import 'package:flutter/material.dart';
+
+class CustomAppBar extends StatelessWidget implements PreferredSizeWidget {
+  const CustomAppBar({
+    super.key,
+    required this.title,
+    this.actions,
+    this.leading,
+    this.backgroundColor,
+    this.foregroundColor,
+    this.elevation = 0,
+  });
+
+  final String title;
+  final List<Widget>? actions;
+  final Widget? leading;
+  final Color? backgroundColor;
+  final Color? foregroundColor;
+  final double elevation;
+
+  @override
+  Widget build(BuildContext context) {
+    final theme = Theme.of(context);
+    final colorScheme = theme.colorScheme;
+
+    return AppBar(
+      title: Text(
+        title,
+        style: theme.textTheme.titleLarge?.copyWith(
+          fontWeight: FontWeight.w600,
+        ),
+      ),
+      leading: leading,
+      actions: actions,
+      elevation: elevation,
+      backgroundColor: backgroundColor ?? colorScheme.surfaceVariant,
+      foregroundColor: foregroundColor ?? colorScheme.onSurfaceVariant,
+      centerTitle: true,
+    );
+  }
+
+  @override
+  Size get preferredSize => const Size.fromHeight(kToolbarHeight);
+}

lib/shared/widgets/empty_state_widget.dart

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+import 'package:flutter/material.dart';
+
+class EmptyStateWidget extends StatelessWidget {
+  const EmptyStateWidget({
+    super.key,
+    required this.icon,
+    required this.title,
+    required this.subtitle,
+    this.actionButton,
+    this.iconSize = 64.0,
+  });
+
+  final IconData icon;
+  final String title;
+  final String subtitle;
+  final Widget? actionButton;
+  final double iconSize;
+
+  @override
+  Widget build(BuildContext context) {
+    final theme = Theme.of(context);
+    final colorScheme = theme.colorScheme;
+
+    return Center(
+      child: Padding(
+        padding: const EdgeInsets.all(32.0),
+        child: Column(
+          mainAxisAlignment: MainAxisAlignment.center,
+          children: [
+            Icon(
+              icon,
+              size: iconSize,
+              color: colorScheme.onSurfaceVariant.withOpacity(0.6),
+            ),
+            const SizedBox(height: 24),
+            Text(
+              title,
+              style: theme.textTheme.headlineSmall?.copyWith(
+                color: colorScheme.onSurfaceVariant,
+                fontWeight: FontWeight.w600,
+              ),
+              textAlign: TextAlign.center,
+            ),
+            const SizedBox(height: 8),
+            Text(
+              subtitle,
+              style: theme.textTheme.bodyLarge?.copyWith(
+                color: colorScheme.onSurfaceVariant.withOpacity(0.7),
+              ),
+              textAlign: TextAlign.center,
+            ),
+            if (actionButton != null) ...[
+              const SizedBox(height: 32),
+              actionButton!,
+            ],
+          ],
+        ),
+      ),
+    );
+  }
+}

lib/shared/widgets/loading_widget.dart

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+import 'package:flutter/material.dart';
+
+class LoadingWidget extends StatelessWidget {
+  const LoadingWidget({
+    super.key,
+    this.message,
+    this.size = 24.0,
+  });
+
+  final String? message;
+  final double size;
+
+  @override
+  Widget build(BuildContext context) {
+    final theme = Theme.of(context);
+    final colorScheme = theme.colorScheme;
+
+    return Center(
+      child: Column(
+        mainAxisSize: MainAxisSize.min,
+        children: [
+          SizedBox(
+            width: size,
+            height: size,
+            child: CircularProgressIndicator(
+              strokeWidth: 2.0,
+              color: colorScheme.primary,
+            ),
+          ),
+          if (message != null) ...[
+            const SizedBox(height: 16),
+            Text(
+              message!,
+              style: theme.textTheme.bodyMedium?.copyWith(
+                color: colorScheme.onSurfaceVariant,
+              ),
+              textAlign: TextAlign.center,
+            ),
+          ],
+        ],
+      ),
+    );
+  }
+}
+
+class LoadingOverlay extends StatelessWidget {
+  const LoadingOverlay({
+    super.key,
+    required this.isLoading,
+    required this.child,
+    this.message,
+  });
+
+  final bool isLoading;
+  final Widget child;
+  final String? message;
+
+  @override
+  Widget build(BuildContext context) {
+    return Stack(
+      children: [
+        child,
+        if (isLoading)
+          Container(
+            color: Colors.black.withOpacity(0.3),
+            child: LoadingWidget(message: message),
+          ),
+      ],
+    );
+  }
+}