fix(main): add safeStorage API compatibility check

- Check if getSelectedStorageBackend exists before calling (Electron 30+)
- Fallback to isEncryptionAvailable() for older Electron versions
- Add try-catch to prevent unhandled promise rejection

src/main/storage.ts

@@ -81,15 +81,31 @@ function writeJsonFile<T>(filePath: string, data: T): void {
  * On Linux, this may return 'basic_text' if no keyring is available
  */
 export function isSecureStorageAvailable(): boolean {
-  const backend = safeStorage.getSelectedStorageBackend();
-  return backend !== "basic_text";
+  try {
+    // Check if the method exists (added in Electron 30+)
+    if (typeof safeStorage.getSelectedStorageBackend === 'function') {
+      const backend = safeStorage.getSelectedStorageBackend()
+      return backend !== 'basic_text'
+    }
+    // Fallback: check if encryption is available
+    return safeStorage.isEncryptionAvailable()
+  } catch {
+    return false
+  }
 }
 
 /**
  * Get the current storage backend name
  */
 export function getStorageBackend(): string {
-  return safeStorage.getSelectedStorageBackend();
+  try {
+    if (typeof safeStorage.getSelectedStorageBackend === 'function') {
+      return safeStorage.getSelectedStorageBackend()
+    }
+    return 'unknown'
+  } catch {
+    return 'unknown'
+  }
 }
 
 /**