* feat(web): merge conflict compare link and branch copy on PR card
- Add buildGitHubCompareUrl helper with unit tests
- Show compare + copy head branch when open PR has merge conflicts
- Add SessionDetail regression test for conflict affordances
Made-with: Cursor
* fix(web): harden merge-conflict PR actions
Address review feedback by correcting the changeset package name, encoding all compare URL path segments, and making conflict actions resilient to unenriched/rate-limited PR data and clipboard/timer edge cases. Add regression tests for URL encoding and conflict-action gating.
Made-with: Cursor
* fix(web): normalize browser timer handles in session detail
Use browser timer handle types consistently in the session detail PR card copy-feedback flow so Next.js typechecking does not mix Node Timeout and DOM number timer signatures.
Made-with: Cursor
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