Migrate Android app to Material3 system colors and improve UX

- Remove AppColors object, migrate to Material3 semantic colors throughout
- Add collapsible dropdown menu for task card actions
- Implement pull-to-refresh on Residences, Documents, and Contractors screens
- Add refresh button to All Tasks screen with forceRefresh support
- Fix nullable function reference error in TaskCard (make onEditClick nullable)
- Fix layout padding issues on All Tasks and Tasks screens
- Remove unused AppColors import from HomeScreen

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

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

iosApp/iosApp/Assets.xcassets/AppIcon.appiconset/Contents.json

@@ -1,7 +1,7 @@
 {
   "images" : [
     {
-      "filename" : "app-icon-1024.png",
+      "filename" : "icon.png",
       "idiom" : "universal",
       "platform" : "ios",
       "size" : "1024x1024"