Add custom interval days support for task frequency

- Add customIntervalDays field to Kotlin models (TaskResponse, TaskCreateRequest, TaskUpdateRequest)
- Update Android AddTaskDialog to show interval field only for "Custom" frequency
- Update Android EditTaskScreen for custom frequency support
- Update iOS TaskFormView for custom frequency support
- Fix preview data in TaskCard and TasksSection to include new field
- Add customIntervalDays to OnboardingFirstTaskView

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

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

composeApp/src/androidMain/kotlin/com/example/casera/MainActivity.kt

@@ -219,6 +219,14 @@ class MainActivity : ComponentActivity(), SingletonImageLoader.Factory {
         lifecycleScope.launch {
             Log.d("MainActivity", "🔄 App resumed, checking for lookup updates...")
             APILayer.refreshLookupsIfChanged()
+
+            // Check if widget completed a task - refresh data if dirty
+            if (TaskCacheStorage.areTasksDirty()) {
+                Log.d("MainActivity", "🔄 Tasks marked dirty by widget, refreshing...")
+                TaskCacheStorage.clearDirtyFlag()
+                // Force refresh tasks from API
+                APILayer.getTasks(forceRefresh = true)
+            }
         }
     }
 

composeApp/src/androidMain/kotlin/com/example/casera/storage/TaskCacheManager.android.kt

@@ -24,9 +24,32 @@ actual class TaskCacheManager(private val context: Context) {
         prefs.edit().remove(KEY_TASKS).apply()
     }
 
+    /**
+     * Check if tasks need refresh due to widget interactions.
+     */
+    actual fun areTasksDirty(): Boolean {
+        return prefs.getBoolean(KEY_DIRTY_FLAG, false)
+    }
+
+    /**
+     * Mark tasks as dirty (needs refresh).
+     * Called when widget modifies task data.
+     */
+    actual fun markTasksDirty() {
+        prefs.edit().putBoolean(KEY_DIRTY_FLAG, true).apply()
+    }
+
+    /**
+     * Clear the dirty flag after tasks have been refreshed.
+     */
+    actual fun clearDirtyFlag() {
+        prefs.edit().putBoolean(KEY_DIRTY_FLAG, false).apply()
+    }
+
     companion object {
         private const val PREFS_NAME = "mycrib_cache"
         private const val KEY_TASKS = "cached_tasks"
+        private const val KEY_DIRTY_FLAG = "tasks_dirty"
 
         @Volatile
         private var instance: TaskCacheManager? = null