Rearchitect UI test suite for complete, non-flaky coverage against live API

- Migrate Suite4-10, SmokeTests, NavigationCriticalPathTests to AuthenticatedTestCase
  with seeded admin account and real backend login
- Add 34 accessibility identifiers across 11 app views (task completion, profile,
  notifications, theme, join residence, manage users, forms)
- Create FeatureCoverageTests (14 tests) covering previously untested features:
  profile edit, theme selection, notification prefs, task completion, manage users,
  join residence, task templates
- Create MultiUserSharingTests (18 API tests) and MultiUserSharingUITests (8 XCUI
  tests) for full cross-user residence sharing lifecycle
- Add cleanup infrastructure: SuiteZZ_CleanupTests auto-wipes test data after runs,
  cleanup_test_data.sh script for manual reset via admin API
- Add share code API methods to TestAccountAPIClient (generateShareCode, joinWithCode,
  getShareCode, listResidenceUsers, removeUser)
- Fix app bugs found by tests:
  - ResidencesListView join callback now uses forceRefresh:true
  - APILayer invalidates task cache when residence count changes
  - AllTasksView auto-reloads tasks when residence list changes
- Fix test quality: keyboard focus waits, Save/Add button label matching,
  Documents tab label (Docs), remove API verification from UI tests
- DataLayerTests and PasswordResetTests now verify through UI, not API calls

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

composeApp/src/commonMain/kotlin/com/tt/honeyDue/data/DataManager.kt

@@ -427,6 +427,13 @@ object DataManager {
         persistToDisk()
     }
 
+    // ==================== CACHE INVALIDATION ====================
+
+    /** Invalidate the tasks cache so the next loadTasks() fetches fresh from API. */
+    fun invalidateTasksCache() {
+        tasksCacheTime = 0L
+    }
+
     // ==================== TASK UPDATE METHODS ====================
 
     fun setAllTasks(response: TaskColumnsResponse) {

composeApp/src/commonMain/kotlin/com/tt/honeyDue/network/APILayer.kt

@@ -401,7 +401,15 @@ object APILayer {
 
         // Update DataManager on success
         if (result is ApiResult.Success) {
+            val oldCount = DataManager.myResidences.value?.residences?.size ?: 0
             DataManager.setMyResidences(result.data)
+            val newCount = result.data.residences.size
+            // Residence list changed (join/leave/create/delete) — invalidate task cache
+            // so next loadTasks() fetches fresh data including tasks from new residences
+            if (newCount != oldCount) {
+                println("[APILayer] Residence count changed ($oldCount → $newCount), invalidating tasks cache")
+                DataManager.invalidateTasksCache()
+            }
         }
 
         return result