fix: make landing footer year dynamic

[MolhamHamwi]

Summary

• Make the landing footer copyright year derive from new Date().getFullYear().
• Hoist the inline X icon out of Footer so the touched page passes targeted lint cleanly.

Test Plan

• pnpm --filter frontend exec eslint app/page.tsx
• pnpm --filter frontend test
• pnpm typecheck
• pnpm test

Closes #69

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[Copilot]

Pull request overview

This PR updates the frontend landing page footer to avoid a stale, hardcoded copyright year and refactors the X (Twitter) icon into a top-level component to satisfy linting.

Changes:

• Replace the hardcoded footer year with new Date().getFullYear() rendered via a currentYear variable.
• Hoist the inline XIcon out of Footer into a top-level function XIcon(...) definition.
• Refactor the makeIcon icon factory into a block-bodied function that returns an inner Icon component.

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