feat(ui): redesign commit selector dropdown

[daryllimyt]

Summary

Redesigns the commit selector dropdown (CommitSelector) so the current/HEAD
commit no longer crowds the row.

The previous design rendered a large filled Current • HEAD badge that
wrapped to two lines, collided with the timestamp, and knocked rows out of
alignment.

Changes

• Replace the oversized combined badge with a left primary accent bar plus a
  soft Current pill; HEAD stays a neutral chip.
• Add author avatars (initials for people, a bot glyph for [bot]
  accounts) to distinguish human vs automated commits at a glance.
• Selected row uses a subtle bg-primary/5 tint instead of the heavy grey fill.
• Tags keep a consistent slot; the relative timestamp is right-aligned with the
  absolute date on hover (title).

Stays flat, neutral, and uses the primary color sparingly per
frontend/CLAUDE.md design rules. Trigger button behavior is unchanged.

Verification

• pnpm -C frontend exec biome check — clean
• pnpm -C frontend run typecheck — clean
• pre-commit hooks (biome + frontend type check) passed

Notes

Scoped to frontend/src/components/registry/commit-selector.tsx. The HTML
design spread used to compare options was kept local and is not part of this PR.

---

Summary by cubic

Redesigned the commit selector dropdown to reduce clutter and make Current/HEAD status and authors easier to scan. Adds avatars, a clearer selected state, and a tighter row layout without changing behavior.

• New Features
  • Replaced the combined "Current • HEAD" badge with a left primary accent bar on the selected row and a soft Current pill; HEAD remains a neutral chip.
  • Added author avatars (initials for people, bot icon for [bot] accounts).
  • Cleaner row layout: subtle bg-primary/5 selection tint, line-clamped message, and author • date line.
  • Right-aligned relative timestamp with absolute date on hover; tags use outline chips in a fixed slot.

^{Written for commit 494800e. Summary will update on new commits.}

[zeropath-ai]

✅ No security or compliance issues detected. Reviewed everything up to 494800e.

Security Overview

• 🔎 Scanned files: 1 changed file(s)
• 🔗 Scan Link: https://zeropath.com/app/repositories/00dffd6c-8834-4dc9-b6d8-b44cd1622986?scanId=f66c3074-3f8e-48bf-8764-b28b91bcb26b&codeScanTypes=PrScan&tab=issues

Detected Code Changes

Change Type	Relevant files
Enhancement	► frontend/src/components/registry/commit-selector.tsx     Add Avatar and Bot icon to display commit author information     Implement logic to determine if an author is a bot     Implement logic to derive author initials for avatar fallback     Update commit item display to include author avatar and bot indicator

[cubic-dev-ai]

No issues found across 1 file

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

_{Re-trigger cubic}

[daryllimyt]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• feat(ui): redesign commit selector dropdown #2883 👈 (View in Graphite)
• feat: add workspace sync export #2859
• main

This stack of pull requests is managed by Graphite. Learn more about stacking.

[blacksmith-sh]

Found 8 test failures on Blacksmith runners:

Failures

Test	View Logs
tests/workspace-sync-settings.test.tsx/ allows manual git URLs when app repositories are available	View Logs
tests/workspace-sync-settings.test.tsx/ disables the repository selector while repositories are loading	View Logs
tests/workspace-sync-settings.test.tsx/ falls back to manual entry when repositories cannot load	View Logs
tests/workspace-sync-settings.test.tsx/ keeps cached app repositories when a repository refetch errors	View Logs
tests/workspace-sync-settings.test.tsx/ keeps explicit select mode for an existing custom git URL	View Logs
tests/workspace-sync-settings.test.tsx/ opens in manual mode for an existing custom git URL	View Logs
tests/workspace-sync-settings.test.tsx/ preserves a selected app repository's non-main default branch	View Logs
tests/workspace-sync-settings.test.tsx/ selects an app repository when repository options are available	View Logs