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/Casera/MyCrib.swift

@@ -262,10 +262,17 @@ struct MediumWidgetView: View {
                     .font(.system(size: 42, weight: .bold))
                     .foregroundStyle(.blue)
                 
-                Text(entry.taskCount == 1 ? "upcoming\n task" : "upcoming\ntasks")
-                    .font(.system(size: 11, weight: .medium))
-                    .foregroundStyle(.secondary)
-                    .lineLimit(2)
+                VStack(alignment: .leading) {
+                    Text("upcoming:")
+                        .font(.system(size: 11, weight: .medium))
+                        .foregroundStyle(.secondary)
+                        .lineLimit(2)
+                    
+                    Text(entry.taskCount == 1 ? "task" : "tasks")
+                        .font(.system(size: 11, weight: .medium))
+                        .foregroundStyle(.secondary)
+                        .lineLimit(2)
+                }
                 
                 Spacer()
             }