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/iosApp/Task/CompletionHistorySheet.swift

@@ -138,7 +138,7 @@ struct CompletionHistoryCard: View {
             // Header with date and completed by
             HStack {
                 VStack(alignment: .leading, spacing: 4) {
-                    Text(formatDate(completion.completionDate))
+                    Text(DateUtils.formatDateTimeWithTime(completion.completionDate))
                         .font(.headline)
                         .foregroundColor(Color.appTextPrimary)
 
@@ -254,29 +254,6 @@ struct CompletionHistoryCard: View {
             PhotoViewerSheet(images: completion.images)
         }
     }
-
-    private func formatDate(_ dateString: String) -> String {
-        let formatters = [
-            "yyyy-MM-dd'T'HH:mm:ssZ",
-            "yyyy-MM-dd'T'HH:mm:ss.SSSZ",
-            "yyyy-MM-dd'T'HH:mm:ss",
-            "yyyy-MM-dd"
-        ]
-
-        let inputFormatter = DateFormatter()
-        let outputFormatter = DateFormatter()
-        outputFormatter.dateStyle = .long
-        outputFormatter.timeStyle = .short
-
-        for format in formatters {
-            inputFormatter.dateFormat = format
-            if let date = inputFormatter.date(from: dateString) {
-                return outputFormatter.string(from: date)
-            }
-        }
-
-        return dateString
-    }
 }
 
 #Preview {