Issue #3: Add Profile Edit Functionality

[D0T-B0X]

Description:
Users cannot modify their profile information after registration. Need UI to edit username, bio, and other profile fields.

Current Limitations:

• Username set at signup cannot be changed
• Bio is empty and cannot be edited
• No way to update any profile information

Required Features:

1. Edit username (with uniqueness validation)
2. Edit bio (max 160 chars)
3. View and edit join date display preference
4. Save/cancel buttons with confirmation

User Flow:

Profile Screen -> [Edit Profile Button] -> Edit Screen
  ├─ Username field (validate uniqueness)
  ├─ Bio text area (160 char limit)
  ├─ [Save] [Cancel]
  └─ Navigate back with updated data

[AratrikaDas]

I would like to add these required features mentioned above. I have worked out already on a profile user page. So, I would like to contribute on this issue stated adding the features such as providing the option as Editable user name and bio, view and edit date display by giving a calendar option and also the Save option for confirmation or the cancel option to refresh out the form.