Bug Fixes - Fixed Dhan broker connection — users now enter their own Client ID, PIN, and TOTP secret instead of using shared credentials. Each user's credentials are stored securely on their device. - Fixed "Data APIs not Subscribed" error being incorrectly treated as a token expiry, preventing unnecessary TOTP refresh loops. - Fixed race condition where options data fetch would fail on app launch due to token generation throttling. The app now retries with the latest stored token. - Improved Dhan authentication error messages — users now see the actual error from Dhan instead of a generic "Invalid TOTP" message.