#7644 fix(desktop): refresh commits after external changes

Fixes #7416.

The commits list wasn't invalidated when an agent or terminal moved HEAD, so it could stay stale until the window refocused. Refresh it on broad git:changed events, alongside the existing branch and diff invalidations. Path-only edits still skip this refresh.

Tests:

• bun test src/renderer/hooks/host-service/useGitStatus/useGitStatus.test.tsx src/renderer/hooks/host-service/useGitStatus/createTrailingRefreshScheduler.test.ts
• bun x biome check apps/desktop/src/renderer/hooks/host-service/useGitStatus/useGitStatus.ts apps/desktop/src/renderer/hooks/host-service/useGitStatus/useGitStatus.test.tsx
• desktop tsc --noEmit

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Summary by cubic

Fixes #7416 by refreshing the commits list when a broad git:changed event occurs, so external HEAD moves (for example, an agent committing outside the app) no longer leave the list stale. Path-only edits still skip this refresh.

Summary by CodeRabbit

• Bug Fixes

  • Commit lists now refresh when Git metadata changes move the current branch position, ensuring displayed commit history stays up to date.
  • Existing behavior is preserved for changes limited to specific file paths; these do not trigger unnecessary commit-list refreshes.

• Tests

  • Added coverage for Git status events and commit-list refresh behavior.