Address review feedback: add Logger.warn and test for invalid SelectedTab fallback

Author: diveshpatil9104

OBAKitCore/Models/UserData/UserDataStore.swift

@@ -664,7 +664,11 @@ public class UserDefaultsStore: NSObject, UserDataStore, StopPreferencesStore {
                 return .map
             }
             let raw = userDefaults.integer(forKey: UserDefaultsKeys.lastSelectedView)
-            return SelectedTab(rawValue: raw) ?? .map
+            guard let tab = SelectedTab(rawValue: raw) else {
+                Logger.warn("Invalid SelectedTab raw value \(raw) in UserDefaults. Falling back to .map.")
+                return .map
+            }
+            return tab
         }
         set {
             userDefaults.set(newValue.rawValue, forKey: UserDefaultsKeys.lastSelectedView)

OBAKitTests/Modeling/UserData/UserDataStoreTests.swift

@@ -159,6 +159,11 @@ class UserDefaultsStoreTests: OBATestCase {
         expect(self.userDefaultsStore.lastSelectedView) == SelectedTab.bookmarks
     }
 
+    func test_selectedTabIndex_invalidRawValueFallsBackToMap() {
+        userDefaults.set(999, forKey: "UserDataStore.lastSelectedView")
+        expect(self.userDefaultsStore.lastSelectedView) == SelectedTab.map
+    }
+
     // MARK: - Debug Mode
 
     func test_debugMode_defaultValue() {