Initial commit: Sage Kitchen Management App v1.0.0

✨ Features implemented:
- Smart inventory tracking with Hive database
- Barcode scanning with auto-populated product info
- Multiple API fallbacks (Open Food Facts, UPCItemDB)
- Smart expiration date predictions by category
- Discord webhook notifications (persisted)
- Custom sage leaf vector icon
- Material Design 3 UI with sage green theme
- Privacy Policy & Terms of Service
- Local-first, privacy-focused architecture

🎨 UI/UX:
- Home dashboard with inventory stats
- Add Item screen with barcode integration
- Inventory list with expiration indicators
- Settings with persistent preferences
- About section with legal docs

🔧 Technical:
- Flutter 3.35.5 with Riverpod state management
- Hive 2.2.3 for local database
- Mobile scanner for barcode detection
- Feature-first architecture

🤖 Generated with Claude Code (https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

lib/core/constants/app_theme.dart

@@ -0,0 +1,80 @@
+import 'package:flutter/material.dart';
+import 'colors.dart';
+
+/// App theme configuration
+class AppTheme {
+  // Light Theme
+  static ThemeData get lightTheme {
+    return ThemeData(
+      useMaterial3: true,
+      colorScheme: ColorScheme.light(
+        primary: AppColors.primary,
+        secondary: AppColors.primaryLight,
+        surface: AppColors.surface,
+        error: AppColors.error,
+      ),
+      scaffoldBackgroundColor: AppColors.background,
+      appBarTheme: const AppBarTheme(
+        backgroundColor: AppColors.primary,
+        foregroundColor: Colors.white,
+        elevation: 0,
+        centerTitle: true,
+      ),
+      cardTheme: CardThemeData(
+        elevation: 2,
+        shape: RoundedRectangleBorder(
+          borderRadius: BorderRadius.circular(12),
+        ),
+      ),
+      floatingActionButtonTheme: const FloatingActionButtonThemeData(
+        backgroundColor: AppColors.primary,
+        foregroundColor: Colors.white,
+      ),
+      inputDecorationTheme: InputDecorationTheme(
+        border: OutlineInputBorder(
+          borderRadius: BorderRadius.circular(8),
+        ),
+        filled: true,
+        fillColor: Colors.white,
+      ),
+      elevatedButtonTheme: ElevatedButtonThemeData(
+        style: ElevatedButton.styleFrom(
+          backgroundColor: AppColors.primary,
+          foregroundColor: Colors.white,
+          padding: const EdgeInsets.symmetric(
+            horizontal: 24,
+            vertical: 12,
+          ),
+          shape: RoundedRectangleBorder(
+            borderRadius: BorderRadius.circular(8),
+          ),
+        ),
+      ),
+      textButtonTheme: TextButtonThemeData(
+        style: TextButton.styleFrom(
+          foregroundColor: AppColors.primary,
+        ),
+      ),
+    );
+  }
+
+  // Dark Theme (for future)
+  static ThemeData get darkTheme {
+    return ThemeData(
+      useMaterial3: true,
+      colorScheme: ColorScheme.dark(
+        primary: AppColors.primaryLight,
+        secondary: AppColors.primary,
+        surface: const Color(0xFF1E1E1E),
+        error: AppColors.error,
+      ),
+      scaffoldBackgroundColor: const Color(0xFF121212),
+      appBarTheme: const AppBarTheme(
+        backgroundColor: Color(0xFF1E1E1E),
+        foregroundColor: Colors.white,
+        elevation: 0,
+        centerTitle: true,
+      ),
+    );
+  }
+}