refactor: extract usekeyboardactivation hook

[mkczarkowski]

Summary

• add a reusable useKeyboardActivation hook to normalize keyboard-initiated activation
• update rule builder and collection UI elements to rely on the shared handler for Enter/Space support
• add Vitest coverage for the shared hook to verify default/callback activation behavior

Testing
npm run lint:check
npm run test

[github-actions]

✅ All checks have passed successfully!

• Lint: ✅
• Unit Tests: ✅
• E2E Tests: ✅

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