feat: sync /races filters to the URL and make /courses navigable

[rootulp]

Summary

Addresses Reddit feedback on tritimes.org with two UX improvements:

1. /races search updates the URL

Previously the distance/year/search filters lived only in client state, so a filtered view couldn't be shared and hitting Back from a race lost your filters.

Now the filters are reflected in the URL (/races?distance=140.6&q=wisconsin):

• Shareable — send someone a link to exactly the races you're looking at.
• Back-button friendly — click a race, hit Back, and your filters are still there (no re-typing when comparing multiple years of the same race).

Implemented by making the URL the single source of truth (derived during render via useSearchParams), so back/forward restoration is free. Uses router.replace so typing doesn't spam history.

2. /courses is now navigable

The redditor noted the Courses page was "a bit deceiving" — it only listed the 10 fastest courses and nothing was clickable.

• Added a full, alphabetical, clickable list of every course for the selected distance, below the existing charts.
• The existing top-10 chart bars are now clickable too.
• Clicking any course lands on a pre-filtered /races view (e.g. /races?distance=140.6&q=Wisconsin), reusing improvement Back to search link on result page should navigate to home #1.

Implementation notes

• New pure module app/src/lib/races-url.ts handles filter↔URL (de)serialization and the course-link helper, with unit tests (races-url.test.ts).
• /races wraps RaceList in <Suspense> (required for useSearchParams); the route stays statically rendered.
• The full CourseList is the accessible, keyboard-navigable path; clickable chart bars are a convenience enhancement.

Testing

• 14 new unit tests for races-url (171 total passing).
• Verified end-to-end in a browser (Playwright): URL sync on type, reload pre-populates, Back restores filters, and course links land pre-filtered.
• npm run build succeeds; /races and /courses remain static.

🤖 Generated with Claude Code

https://claude.ai/code/session_01DLbmbQZFx5Ffuu4LUhPj6p

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Project	Deployment	Actions	Updated (UTC)
tritimes	Ready	Preview, Comment	Jul 16, 2026 4:42am

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 2ff7a3b9-c523-4b1a-9806-2be97777a662

📥 Commits

Reviewing files that changed from the base of the PR and between e473a25 and 019a816.

📒 Files selected for processing (8)

• app/src/app/courses/course-charts.tsx
• app/src/app/courses/course-list.tsx
• app/src/app/courses/page.tsx
• app/src/app/races/page.tsx
• app/src/app/races/race-list.tsx
• app/src/components/CourseBarChart.tsx
• app/src/lib/__tests__/races-url.test.ts
• app/src/lib/races-url.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch worktree-velvet-seeking-nova

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