Migrate iOS app to system colors and improve UI/UX

- Remove AppColors struct, migrate to iOS system colors throughout
- Redesign ContractorFormSheet to use native SwiftUI Form components
- Add color-coded icons to contractor form sections
- Improve dark mode contrast for task cards
- Add background colors to document detail fields
- Fix text alignment issues in ContractorDetailView
- Make task completion lists expandable/collapsible by default
- Clear app badge on launch and when app becomes active
- Update button styling with proper gradients and shadows
- Improve form field focus states and accessibility

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

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

iosApp/MyCribExtension.entitlements

@@ -4,7 +4,7 @@
 <dict>
 	<key>com.apple.security.application-groups</key>
 	<array>
-		<string>group.com.tt.mycrib.MyCrib</string>
+		<string>group.com.tt.mycrib.MyCribDev</string>
 	</array>
 </dict>
 </plist>