Polish empty state for /transactions with helpful CTA

[greatest0fallt1me]

Description

This is a UI/UX issue for the GrantFox campaign. This is a UI/UX issue for the GrantFox campaign. Replace bare empty state with illustration + action button.

Requirements and Context

• Implement per the description
• Add focused tests for the change
• Document any API/visible changes
• Adhere to repo's lint and code style
• Must be secure, tested, and documented
• Should be efficient and easy to review

Suggested Execution

1. Fork the repo and create a branch

   git checkout -b task/transactions-empty

2. Implement changes
   • app/transactions/page.tsx
   • app/components/EmptyState.tsx
3. Test and commit
   • Run the repo's standard test suite and lint
   • Cover edge cases; include output in the PR

Example commit message

feat: helpful empty state on /transactions

Acceptance Criteria

• Implementation matches the description
• Tests added and passing
• Code review approved
• Docs updated

Guidelines

• Responsive across all breakpoints
• WCAG 2.1 AA accessibility
• Design-token + dark-mode consistency
• Clear documentation and inline comments
• Timeframe: 96 hours

[kalifabuild-dev]

@kalifabuild-dev has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

hi maintenance kindly assign me to work on this issue

ℹ️ Repo Maintainers: To accept this application, review their application or assign @kalifabuild-dev to this issue.