Implement logout

Twigs/DataStore.swift

@@ -408,6 +408,26 @@ class DataStore : ObservableObject {
         await self.login(username: username, password: password)
     }
     
+    func logout() {
+        self.budgets = .empty
+        self.budget = .empty
+        self.overview = .empty
+        self.categories = .empty
+        self.category = .empty
+        self.transactions = .empty
+        self.transaction = .empty
+        self.recurringTransactions = .empty
+        self.recurringTransaction = .empty
+        self.selectedRecurringTransaction = nil
+        self.selectedCategory = nil
+        self.selectedTransaction = nil
+        self.currentUser = .empty
+        self.user = .empty
+        self.token = nil
+        UserDefaults.standard.removeObject(forKey: KEY_TOKEN)
+        UserDefaults.standard.removeObject(forKey: KEY_USER_ID)
+    }
+    
     func loadProfile() async {
         guard let userId = self.userId, !userId.isEmpty else {
             self.currentUser = .error(UserStatus.unauthenticated)

Twigs/TabbedBudgetView.swift

@@ -25,7 +25,9 @@ struct TabbedBudgetView: View {
                             Button("budgets", action: {
                                 self.dataStore.showBudgetSelection = true
                             }).padding()
-                        })
+                        }, trailing: Button("logout", action: {
+                            self.dataStore.logout()
+                        }).padding())
                 }
                 .tabItem {
                     Image(systemName: "chart.line.uptrend.xyaxis.circle.fill")

Twigs/en.lproj/Localizable.strings

@@ -37,6 +37,7 @@
 "prompt_password" = "Password";
 "action_login" = "Login";
 "loading_login" = "Logging in...";
+"logout" = "Logout";
 
 // MARK: Registration
 "info_register" = "Don't have an account?";

Twigs/es.lproj/Localizable.strings

@@ -37,6 +37,7 @@
 "prompt_password" = "Contraseña";
 "action_login" = "Inicia sesión";
 "loading_login" = "Iniciando sesión...";
+"logout" = "Cerrar sesión";
 
 // MARK: Registration
 "info_register" = "¿No tienes una cuenta?";