fixed follow button issue with fixing post feature.

[ShridharAggrwal]

Description

This PR fixes issues with the follow button state persistence and real-time updates:

Changes made:

• Added state maintenance in FollowBloc using _currentFollowStatus
• Converted FollowButton to StatefulWidget for better state management
• Added loading indicator during follow/unfollow actions
• Fixed real-time updates of follower counts
• Improved error handling and state transitions

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

Testing:

• Verified follow/unfollow actions persist correctly
• Confirmed button text stays consistent with actual follow status
• Tested real-time updates of follower countsFixes follow button does not work properly #326

screen-recording-20250403-193538_ugr49ejm.mp4

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have checked my code and corrected any misspellings

Maintainer Checklist

• closes follow button does not work properly #326
• Tag the PR with the appropriate labels