Fix/balance fetch

[Aman-zishan]

Description of change

• Fetches STX balance with no cache
• Made contract address values dynamic
• Implemented username validation in registration page and login page
• 90 days validation restriction on deadline/tenure
• A few wording changes

Pull-Request Checklist

• Code is up-to-date with the main branch
• yarn lint passes with this change
• yarn clarinet:check passes with this change
• yarn clarinet:tests passes with this
• yarn unit-tests passes with this
• Run yarn eol
• Run yarn format
• Run yarn cleanup
• This pull request links relevant issues as Fixes #0000
• There are new or updated unit tests validating the change
• Documentation has been updated to reflect this change
• The new commits follow conventions outlined in the conventional commit spec