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

pubspec.lock

@@ -558,6 +558,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.1.8"
+  popover:
+    dependency: "direct main"
+    description:
+      name: popover
+      sha256: "0606f3e10f92fc0459f5c52fd917738c29e7552323b28694d50c2d3312d0e1a2"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.3.1"
   provider:
     dependency: "direct main"
     description: