Desktop UI shows 'main' branch instead of worktree branch after EnterWorktree

Bug

After entering a git worktree via EnterWorktree, the Desktop app UI continues to display the main repo's branch (e.g., main) instead of the worktree's branch (e.g., claude/loving-torvalds).

Steps to Reproduce

1. Open Claude Code Desktop app in a git repo on main
2. Use EnterWorktree to enter/create a worktree (e.g., loving-torvalds)
3. Observe the branch indicator in the Desktop UI

Expected

UI shows the worktree branch: claude/loving-torvalds

Actual

UI still shows main (the branch of the original repo root).

Verification

CLI commands confirm the session is correctly operating in the worktree:

CWD: /Users/.../bc-retail-hub/.claude/worktrees/loving-torvalds
Branch: claude/loving-torvalds
Git dir: /Users/.../bc-retail-hub/.git/worktrees/loving-torvalds
Toplevel: /Users/.../bc-retail-hub/.claude/worktrees/loving-torvalds

All file operations and commits happen on the correct worktree branch — this is purely a UI display issue.

Environment

• Claude Code Desktop app (macOS)
• Darwin 25.3.0
• Git worktree created via .claude/worktrees/