feat: Update theme colors and add Today Schedule screen

- Changed color scheme from ShadBlueColorScheme to ShadZincColorScheme in main.dart
- Added getMostRecentIntake method in SupplementProvider to retrieve the latest intake for a supplement
- Integrated TodayScheduleScreen into HomeScreen with a new BottomNavigationBar item
- Updated SupplementsListScreen title and adjusted layout for better UX
- Enhanced SupplementCard to support undoing last taken action and improved popover menu options
- Added popover package for better UI interactions

lib/main.dart

@@ -98,11 +98,11 @@ class MyApp extends StatelessWidget {
             title: 'Supplements Tracker',
             theme: ShadThemeData(
               brightness: Brightness.light,
-              colorScheme: const ShadBlueColorScheme.light(),
+              colorScheme: const ShadZincColorScheme.light(),
             ),
             darkTheme: ShadThemeData(
               brightness: Brightness.dark,
-              colorScheme: const ShadBlueColorScheme.dark(),
+              colorScheme: const ShadZincColorScheme.dark(),
             ),
             themeMode: settingsProvider.themeMode,
             home: const HomeScreen(),