Optimize subscription tier management and empty state logic

Changes:
- Make currentTier a computed property from StoreKit instead of stored value
- Initialize StoreKit at app launch and refresh on foreground for ready subscription status
- Fix empty state logic: show empty state when limit > 0, upgrade prompt when limit = 0
- Add subscription status display in Profile screen (iOS/Android)
- Add upgrade prompts to Residences and Tasks screens for free tier users
- Improve SubscriptionHelper with better tier checking logic

iOS:
- SubscriptionCache: currentTier now computed from StoreKit.purchasedProductIDs
- StoreKitManager: add refreshSubscriptionStatus() method
- AppDelegate: initialize StoreKit at launch and refresh on app active
- ContractorsListView: use shouldShowUpgradePrompt(currentCount:limitKey:)
- WarrantiesTabContent/DocumentsTabContent: same empty state fix
- ProfileTabView: display current tier and limitations status
- ResidencesListView/ResidenceDetailView: add upgrade prompts for free users
- AllTasksView: add upgrade prompt for free users

Android:
- ContractorsScreen/DocumentsScreen: fix empty state logic
- ProfileScreen: display subscription status and limits
- ResidencesScreen/ResidenceDetailScreen: add upgrade prompts
- UpgradeFeatureScreen: improve UI layout

Shared:
- APILayer: add getSubscriptionStatus() method
- SubscriptionHelper: add hasAccessToFeature() utility
- Remove duplicate subscription checking logic

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

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

iosApp/iosApp/Residence/ResidenceDetailView.swift

@@ -25,7 +25,9 @@ struct ResidenceDetailView: View {
     @State private var showReportConfirmation = false
     @State private var showDeleteConfirmation = false
     @State private var isDeleting = false
-    
+    @State private var showingUpgradePrompt = false
+    @StateObject private var subscriptionCache = SubscriptionCacheWrapper.shared
+
     @Environment(\.dismiss) private var dismiss
     
     var body: some View {
@@ -120,6 +122,9 @@ struct ResidenceDetailView: View {
                 Text("Are you sure you want to archive \"\(task.title)\"? You can unarchive it later from archived tasks.")
             }
         }
+        .sheet(isPresented: $showingUpgradePrompt) {
+            UpgradePromptView(triggerKey: "add_11th_task", isPresented: $showingUpgradePrompt)
+        }
 
         // MARK: onChange & lifecycle
         .onChange(of: viewModel.reportMessage) { message in
@@ -255,7 +260,13 @@ private extension ResidenceDetailView {
             }
             
             Button {
-                showAddTask = true
+                // Check LIVE task count before adding
+                let totalTasks = tasksResponse?.columns.reduce(0) { $0 + $1.tasks.count } ?? 0
+                if subscriptionCache.shouldShowUpgradePrompt(currentCount: totalTasks, limitKey: "tasks") {
+                    showingUpgradePrompt = true
+                } else {
+                    showAddTask = true
+                }
             } label: {
                 Image(systemName: "plus")
             }

iosApp/iosApp/Residence/ResidencesListView.swift

@@ -5,7 +5,9 @@ struct ResidencesListView: View {
     @StateObject private var viewModel = ResidenceViewModel()
     @State private var showingAddResidence = false
     @State private var showingJoinResidence = false
+    @State private var showingUpgradePrompt = false
     @StateObject private var authManager = AuthenticationManager.shared
+    @StateObject private var subscriptionCache = SubscriptionCacheWrapper.shared
 
     
     var body: some View {
@@ -71,7 +73,13 @@ struct ResidencesListView: View {
         .toolbar {
             ToolbarItemGroup(placement: .navigationBarTrailing) {
                 Button(action: {
-                    showingJoinResidence = true
+                    // Check if we should show upgrade prompt before joining
+                    let currentCount = viewModel.myResidences?.residences.count ?? 0
+                    if subscriptionCache.shouldShowUpgradePrompt(currentCount: currentCount, limitKey: "properties") {
+                        showingUpgradePrompt = true
+                    } else {
+                        showingJoinResidence = true
+                    }
                 }) {
                     Image(systemName: "person.badge.plus")
                         .font(.system(size: 18, weight: .semibold))
@@ -79,7 +87,13 @@ struct ResidencesListView: View {
                 }
 
                 Button(action: {
-                    showingAddResidence = true
+                    // Check if we should show upgrade prompt before adding
+                    let currentCount = viewModel.myResidences?.residences.count ?? 0
+                    if subscriptionCache.shouldShowUpgradePrompt(currentCount: currentCount, limitKey: "properties") {
+                        showingUpgradePrompt = true
+                    } else {
+                        showingAddResidence = true
+                    }
                 }) {
                     Image(systemName: "plus.circle.fill")
                         .font(.system(size: 22, weight: .semibold))
@@ -101,6 +115,9 @@ struct ResidencesListView: View {
                 viewModel.loadMyResidences()
             })
         }
+        .sheet(isPresented: $showingUpgradePrompt) {
+            UpgradePromptView(triggerKey: "add_second_property", isPresented: $showingUpgradePrompt)
+        }
         .onAppear {
             if authManager.isAuthenticated {
                 viewModel.loadMyResidences()