fix(app): add worktree selector for git worktrees

[swalker326]

Issue for this PR

Closes #13782

Related: #14082, #10665

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

This adds a git worktree selector in the project header while preserving existing workspace sidebar behavior.

• Adds explicit worktree selection/switching for git projects.
• Restores sortable workspace rows and workspace actions (rename/reset/delete/reorder) in the sidebar.
• Keeps project navigation stable by remembering the active workspace and using safer fallback behavior during pending worktree sync.
• Updates workspace e2e coverage to match the new selector model (no enable/disable toggle path, but workspace lifecycle coverage remains).

How did you verify your code works?

• Ran bun test:e2e:local -- e2e/projects/workspaces.spec.ts e2e/projects/projects-switch.spec.ts e2e/projects/workspace-new-session.spec.ts in packages/app
• Ran full bun test:e2e:local in packages/app (98 passed, 3 skipped)
• Ran bun turbo test from repo root (all tasks successful)
• Push hook also ran bun turbo typecheck successfully

Screenshots / recordings

UI change verified locally; can add updated screenshots if maintainers request.

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

[github-actions]

Thanks for your contribution!

This PR doesn't have a linked issue. All PRs must reference an existing issue.

Please:

1. Open an issue describing the bug/feature (if one doesn't exist)
2. Add Fixes #<number> or Closes #<number> to this PR description

See CONTRIBUTING.md for details.

[github-actions]

The following comment was made by an LLM, it may be inaccurate:

Based on my search, I found a potentially related PR:

Related PR:

• feat(tui): add worktree support for session creation #13528 - feat(tui): add worktree support for session creation
  • feat(tui): add worktree support for session creation #13528
  • This appears to be related as it also adds worktree support, though it's for the TUI rather than the app UI. Worth checking if there's overlapping functionality or logic.

The other results (#4817, #12008, #14266) address different aspects of worktree or git functionality but don't appear to be direct duplicates of the worktree selector fix in PR #14374.

[github-actions]

Thanks for updating your PR! It now meets our contributing guidelines. 👍