feat: add side-by-side market comparison modal and update events section

[dolaoluwa574-source]

Closes #466

What changed

• Added a new modal component at CompareMarketsModal.tsx with:
  • side-by-side market details
  • responsive layout for mobile and desktop
  • keyboard support for closing and clearing
  • accessible dialog semantics and focus-friendly controls
• Wired the new modal into the events experience via events-section.tsx.
• Added focused regression coverage in compare-overlay.test.tsx.
• Documented the visible UI change in README.md.

Verification

• Editor diagnostics report no errors in the new modal and wiring files.
• I could not run the Jest/lint commands in this session because terminal execution was skipped, so the commands to run locally are:
  • pnpm exec jest --runInBand components/market/__tests__/compare-overlay.test.tsx
  • pnpm lint

No API contract changes were introduced; this is a UI/UX enhancement only.

Made changes.

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[greatest0fallt1me]

Merged into main via admin resolver (-X theirs).

[greatest0fallt1me]

Nice work — merging. Thanks for the tests too!