Keep composer focused after toolbar and mode changes

- Add a shared composer-focus scheduler in `ChatView`
- Refocus composer after runtime mode, model, effort, and env mode selections
- Let `BranchToolbar` request composer focus after branch/worktree actions
c6047688a1Julius Marminge committed on 2/15/2026, 9:29:27 AMparent98c4b7c
2 files changedLine totals unavailable