feat(login): implement credential management for login modal

services/storage.ts

@@ -9,6 +9,7 @@ const STORAGE_KEYS = {
   FAVORITES: "mytv_favorites",
   PLAY_RECORDS: "mytv_play_records",
   SEARCH_HISTORY: "mytv_search_history",
+  LOGIN_CREDENTIALS: "mytv_login_credentials",
 } as const;
 
 // --- Type Definitions (aligned with api.ts) ---
@@ -37,6 +38,11 @@ export interface AppSettings {
   m3uUrl: string;
 }
 
+export interface LoginCredentials {
+  username: string;
+  password: string;
+}
+
 // --- Helper ---
 const generateKey = (source: string, id: string) => `${source}+${id}`;
 
@@ -302,3 +308,32 @@ export class SettingsManager {
     await AsyncStorage.removeItem(STORAGE_KEYS.SETTINGS);
   }
 }
+
+// --- LoginCredentialsManager (Uses AsyncStorage) ---
+export class LoginCredentialsManager {
+  static async get(): Promise<LoginCredentials | null> {
+    try {
+      const data = await AsyncStorage.getItem(STORAGE_KEYS.LOGIN_CREDENTIALS);
+      return data ? JSON.parse(data) : null;
+    } catch (error) {
+      console.info("Failed to get login credentials:", error);
+      return null;
+    }
+  }
+
+  static async save(credentials: LoginCredentials): Promise<void> {
+    try {
+      await AsyncStorage.setItem(STORAGE_KEYS.LOGIN_CREDENTIALS, JSON.stringify(credentials));
+    } catch (error) {
+      console.error("Failed to save login credentials:", error);
+    }
+  }
+
+  static async clear(): Promise<void> {
+    try {
+      await AsyncStorage.removeItem(STORAGE_KEYS.LOGIN_CREDENTIALS);
+    } catch (error) {
+      console.error("Failed to clear login credentials:", error);
+    }
+  }
+}