Add centralized DateUtils and enhance contractor detail views

- Add DateUtils.kt for shared Kotlin date formatting with formatDate,
  formatDateMedium, formatDateTime, formatRelativeDate, and isOverdue
- Add DateUtils.swift for iOS with matching date formatting functions
- Enhance ContractorDetailScreen (Android) with quick action buttons
  (call, email, website, directions), clickable contact rows, residence
  association, statistics section, and metadata
- Enhance ContractorDetailView (iOS) with same features, refactored into
  smaller @ViewBuilder functions to fix Swift compiler type-check timeout
- Fix empty string handling in iOS - check !isEmpty in addition to != nil
  for optional fields like phone, email, website, address
- Update various task and document views to use centralized DateUtils

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

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

iosApp/CaseraExtension.entitlements

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