feat: profile My Challenges section + fix community challenge history titles

[Jhong098]

Closes #21.

lib/actions/community-challenges.ts:

• getMyAuthoredChallenges() — returns all challenges authored by the
  current user (id, title, tier, attempt/pass/upvote counts, status,
  published_at), newest first
• getCommunityChallengeTitles(uuids) — batch-fetches a UUID→title map
  for resolving community challenge IDs in the completions history

app/profile/page.tsx:

• "My Challenges" section for is_challenge_author users: lists published
  challenges with attempt count, pass rate, upvote count, and a View link
• History rows: community challenge completions now show the challenge
  title (via getCommunityChallengeTitles) and link to /community/
  instead of displaying the raw "community:" ID string
• Also tightens the XP bar transition from transition-all to
  transition-[width]

tests/unit/lib/communityChallengess.test.ts:

• 7 new unit tests covering auth guard, normal data, empty result,
  and DB error paths for both new server actions

https://claude.ai/code/session_017P7S4SuivspHeeXfok7WzX

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
poly-sd	Ready	Preview, Comment	May 4, 2026 0:11am

[codecov-commenter]

⚠️ Please install the to ensure uploads and comments are reliably processed by Codecov.

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.50%. Comparing base (653a9ea) to head (4df50fa).
❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #22   +/-   ##
=======================================
  Coverage   72.50%   72.50%           
=======================================
  Files          11       11           
  Lines         440      440           
  Branches      134      134           
=======================================
  Hits          319      319           
  Misses         72       72           
  Partials       49       49           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.