Added core data models, repositories, and utilities

lifetimer/lib/core/widgets/app_scaffold.dart

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+import 'package:flutter/material.dart';
+
+class AppScaffold extends StatelessWidget {
+  final String? title;
+  final Widget body;
+  final List<Widget>? actions;
+  final Widget? floatingActionButton;
+  final bool showBackButton;
+  final VoidCallback? onBackPressed;
+  final Widget? bottomNavigationBar;
+
+  const AppScaffold({
+    super.key,
+    this.title,
+    required this.body,
+    this.actions,
+    this.floatingActionButton,
+    this.showBackButton = false,
+    this.onBackPressed,
+    this.bottomNavigationBar,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: title != null
+          ? AppBar(
+              title: Text(title!),
+              centerTitle: true,
+              automaticallyImplyLeading: showBackButton,
+              leading: showBackButton
+                  ? IconButton(
+                      icon: const Icon(Icons.arrow_back),
+                      onPressed: onBackPressed ?? () => Navigator.pop(context),
+                    )
+                  : null,
+              actions: actions,
+            )
+          : null,
+      body: SafeArea(child: body),
+      floatingActionButton: floatingActionButton,
+      bottomNavigationBar: bottomNavigationBar,
+    );
+  }
+}

lifetimer/lib/core/widgets/bottom_nav_scaffold.dart

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+import 'package:flutter/material.dart';
+import 'package:go_router/go_router.dart';
+
+class BottomNavScaffold extends StatefulWidget {
+  final Widget child;
+
+  const BottomNavScaffold({
+    super.key,
+    required this.child,
+  });
+
+  @override
+  State<BottomNavScaffold> createState() => _BottomNavScaffoldState();
+}
+
+class _BottomNavScaffoldState extends State<BottomNavScaffold> {
+  int _currentIndex = 0;
+
+  final List<NavigationDestination> _destinations = const [
+    NavigationDestination(
+      icon: Icon(Icons.home_outlined),
+      selectedIcon: Icon(Icons.home),
+      label: 'Home',
+    ),
+    NavigationDestination(
+      icon: Icon(Icons.flag_outlined),
+      selectedIcon: Icon(Icons.flag),
+      label: 'Goals',
+    ),
+    NavigationDestination(
+      icon: Icon(Icons.people_outline),
+      selectedIcon: Icon(Icons.people),
+      label: 'Social',
+    ),
+    NavigationDestination(
+      icon: Icon(Icons.person_outline),
+      selectedIcon: Icon(Icons.person),
+      label: 'Profile',
+    ),
+  ];
+
+  void _onDestinationSelected(int index) {
+    setState(() {
+      _currentIndex = index;
+    });
+
+    switch (index) {
+      case 0:
+        context.go('/home');
+        break;
+      case 1:
+        context.go('/goals');
+        break;
+      case 2:
+        context.go('/social');
+        break;
+      case 3:
+        context.go('/profile');
+        break;
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      body: widget.child,
+      bottomNavigationBar: NavigationBar(
+        selectedIndex: _currentIndex,
+        onDestinationSelected: _onDestinationSelected,
+        destinations: _destinations,
+      ),
+    );
+  }
+}

lifetimer/lib/core/widgets/empty_state.dart

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+import 'package:flutter/material.dart';
+
+class EmptyState extends StatelessWidget {
+  final IconData icon;
+  final String title;
+  final String? subtitle;
+  final String? actionLabel;
+  final VoidCallback? onAction;
+
+  const EmptyState({
+    super.key,
+    required this.icon,
+    required this.title,
+    this.subtitle,
+    this.actionLabel,
+    this.onAction,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    return Center(
+      child: Padding(
+        padding: const EdgeInsets.all(32.0),
+        child: Column(
+          mainAxisAlignment: MainAxisAlignment.center,
+          children: [
+            Icon(
+              icon,
+              size: 80,
+              color: Theme.of(context).colorScheme.primary.withOpacity(0.5),
+            ),
+            const SizedBox(height: 24),
+            Text(
+              title,
+              style: Theme.of(context).textTheme.headlineMedium,
+              textAlign: TextAlign.center,
+            ),
+            if (subtitle != null) ...[
+              const SizedBox(height: 8),
+              Text(
+                subtitle!,
+                style: Theme.of(context).textTheme.bodyMedium,
+                textAlign: TextAlign.center,
+              ),
+            ],
+            if (actionLabel != null && onAction != null) ...[
+              const SizedBox(height: 24),
+              ElevatedButton(
+                onPressed: onAction,
+                child: Text(actionLabel!),
+              ),
+            ],
+          ],
+        ),
+      ),
+    );
+  }
+}

lifetimer/lib/core/widgets/loading_indicator.dart

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+import 'package:flutter/material.dart';
+
+class LoadingIndicator extends StatelessWidget {
+  final String? message;
+
+  const LoadingIndicator({
+    super.key,
+    this.message,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    return Center(
+      child: Column(
+        mainAxisAlignment: MainAxisAlignment.center,
+        children: [
+          const CircularProgressIndicator(),
+          if (message != null) ...[
+            const SizedBox(height: 16),
+            Text(
+              message!,
+              style: Theme.of(context).textTheme.bodyMedium,
+            ),
+          ],
+        ],
+      ),
+    );
+  }
+}