Add OAuth login support and streamline authentication flows

- Introduced `oauthLogin` method in `electron/preload.ts` and backend IPC handlers for OAuth via `BrowserWindow`.
- Replaced web-based OAuth redirection with Electron-specific implementation for Google, Facebook, and Apple.
- Refactored `SocialForm.tsx` to handle OAuth login success and token management via Electron.
- Updated `User`, `QuillSense`, and context methods to include `quill-trial` subscriptions and extended login logic.
- Cleaned up code, removed unused imports, and improved error handling for authentication scenarios.

lib/models/User.ts

@@ -49,7 +49,7 @@ export const writingLevel: SelectBoxProps[] = [
 ];
 
 export default class User {
-    static getCurrentSubscription(user: UserProps | null, type: "quill-sense" | "use-your-keys"): Subscription | null {
+    static getCurrentSubscription(user: UserProps | null, type: "quill-sense" | "use-your-keys" | "quill-trial"): Subscription | null {
         if (!user || !user.subscription || user.subscription.length === 0) {
             return null;
         }