Fix residence auto-update, widget theming, and document patterns

- Fix residence detail not updating after edit:
  - DataManager.updateResidence() now updates both _residences and _myResidences
  - ResidenceViewModel auto-updates selectedResidence when data changes
  - No pull-to-refresh needed after editing

- Add widget theme support:
  - Widgets now use user's selected theme via App Group UserDefaults
  - ThemeManager has simplified version for widget extension context
  - Added WIDGET_EXTENSION compiler flag to CaseraExtension target

- Redesign widget views with organic aesthetic:
  - Updated FreeWidgetView, SmallWidgetView, MediumWidgetView, LargeWidgetView
  - Created OrganicTaskRowView, OrganicStatsView, OrganicStatPillWidget

- Document patterns in CLAUDE.md:
  - Added Mutation & Auto-Update Pattern section
  - Added iOS Shared Components documentation
  - Documented reusable buttons, forms, empty states, cards, modifiers

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

iosApp/iosApp/Residence/ResidenceViewModel.swift

@@ -33,6 +33,11 @@ class ResidenceViewModel: ObservableObject {
                 if myResidences != nil {
                     self?.isLoading = false
                 }
+                // Auto-update selectedResidence if it exists in the updated list
+                if let currentSelected = self?.selectedResidence,
+                   let updatedResidence = myResidences?.residences.first(where: { $0.id == currentSelected.id }) {
+                    self?.selectedResidence = updatedResidence
+                }
             }
             .store(in: &cancellables)
 
@@ -40,6 +45,11 @@ class ResidenceViewModel: ObservableObject {
             .receive(on: DispatchQueue.main)
             .sink { [weak self] residences in
                 self?.residences = residences
+                // Auto-update selectedResidence if it exists in the updated list
+                if let currentSelected = self?.selectedResidence,
+                   let updatedResidence = residences.first(where: { $0.id == currentSelected.id }) {
+                    self?.selectedResidence = updatedResidence
+                }
             }
             .store(in: &cancellables)