test: typo in landing footer copyright year

[tomazzi14]

Bug

The landing page footer renders "© 2024 Ghbounty" but we're already in 2026.

Expected

The year should be the current year, dynamically derived from `new Date().getFullYear()` so we never have to remember to bump it manually.

Acceptance criteria

• Footer year is no longer hardcoded.
• Renders the current year on every page load.
• No new dependencies.

Notes

Tiny placeholder issue used to test the end-to-end bounty flow (create + fee transfer + cancel + refund).