Refactor iOS and Android code to follow single responsibility principle

- iOS: Extracted views and helpers into separate files
  - Created Documents/Helpers/DocumentHelpers.swift for type/category helpers
  - Created Documents/Components/ with individual view files:
    - ImageViewerSheet.swift
    - WarrantyCard.swift
    - DocumentCard.swift
    - EmptyStateView.swift
    - WarrantiesTabContent.swift
    - DocumentsTabContent.swift
  - Cleaned up DocumentDetailView.swift and DocumentsWarrantiesView.swift

- Android: Extracted composables into organized component structure
  - Created ui/components/documents/ package with:
    - DocumentCard.kt (WarrantyCardContent, RegularDocumentCardContent, formatFileSize)
    - DocumentStates.kt (EmptyState, ErrorState)
    - DocumentsTabContent.kt
  - Reduced DocumentsScreen.kt from 506 lines to 211 lines
  - Added missing imports to DocumentDetailScreen.kt and EditDocumentScreen.kt

Net result: +770 insertions, -716 deletions across 15 files

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

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

iosApp/iosApp/Documents/Helpers/DocumentHelpers.swift

@@ -0,0 +1,34 @@
+import Foundation
+
+struct DocumentTypeHelper {
+    static func displayName(for value: String) -> String {
+        switch value {
+        case "warranty": return "Warranty"
+        case "manual": return "User Manual"
+        case "receipt": return "Receipt/Invoice"
+        case "inspection": return "Inspection Report"
+        case "permit": return "Permit"
+        case "deed": return "Deed/Title"
+        case "insurance": return "Insurance"
+        case "contract": return "Contract"
+        case "photo": return "Photo"
+        default: return "Other"
+        }
+    }
+}
+
+struct DocumentCategoryHelper {
+    static func displayName(for value: String) -> String {
+        switch value {
+        case "appliance": return "Appliance"
+        case "hvac": return "HVAC"
+        case "plumbing": return "Plumbing"
+        case "electrical": return "Electrical"
+        case "roofing": return "Roofing"
+        case "structural": return "Structural"
+        case "landscaping": return "Landscaping"
+        case "general": return "General"
+        default: return "Other"
+        }
+    }
+}