Fix bugs in my flutter app -- 2

Budget: $50

https://drive.google.com/file/d/11FoeGoh7WKmSJZJllR5LtiR7kVvcqCkt/view?usp=drivesdk

Here is APK you can check.

Bugs:
- Setup the Group chat screens (basic functionality already there in the code): add categories, favorite, icon, search, members count and public link
- Fix crash issue in firebase OTP login
- App takes a very long time to load at start up
- There is a white screen before splash screen
- There is black flashes when splash screen in on
- Intro screens don't load the images fast when it starts
- Search function in dashboard and search