fix: update release workflow for pnpm migration

[Copilot]

The release workflow broke after switching from npm to pnpm — actions/setup-node was pointing at the non-existent ui/package-lock.json instead of ui/pnpm-lock.yaml, causing the cache step to fail and halt the job.

Additionally, cargo dist generate silently strips working-directory from injected build-setup steps, so pnpm commands were running from the repo root (no package.json there) rather than ui/.

Changes

• .github/build-setup.yml — fix cache-dependency-path from ui/package-lock.json → ui/pnpm-lock.yaml; replace working-directory: ./ui with inline cd ui && prefix on the pnpm commands to survive cargo-dist's step injection
• .github/workflows/release.yml — regenerated via dist generate to reflect the above changes

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[lquerel]

LGTM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.2%. Comparing base (b8ee7be) to head (1ce88c8).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #1289   +/-   ##
=====================================
  Coverage   81.2%   81.2%           
=====================================
  Files        111     111           
  Lines       9377    9377           
=====================================
  Hits        7623    7623           
  Misses      1754    1754           

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