Git integration: branch picker + worktrees#3

Filter out stale worktree paths from branch listing

Fix flash of 'Initialize git' when switching branch/worktree

Fix worktree→local branch switch causing 'already used by worktree' error

Fix session not restarting when switching to a worktree branch

Enrich branches with worktree paths, fix toolbar display, and improve HMR config

Add react-query, refactor BranchToolbar async state, and fix stale deps

Fix envMode reset bug and use shell-free git spawn

Merge remote-tracking branch 'origin/main' into juliusmarminge/git-integration

Polish turbo task graph and dev scripts

Suppress tsdown inlineOnly warning for server build

Fix server build: add zod to noExternal to prevent tsdown error

fix

Fix dev:desktop task graph to match main's env var patterns

Fix CI typecheck: build contracts before typechecking dependents

Fix CI typecheck: point contracts types to source and remove dead code

Move toolbar below chat input, fix electron preload bundling, and update build configs

plans

eh

Restore git toolbar via websocket backend

Polish git worktree helpers after rebase

Add test for listGitBranches from worktree cwd

Fix branch query cwd for worktree threads and error banner light mode

Fix "Open in editor" to respect worktree path

kewl

resource management

Extract git functions and add integration tests

Add light mode support for git branch picker and default branch label

Add branch/worktreePath to persistence test expectation

Fix typecheck errors for branch/worktree fields

Add git checkout support and clear errors on success

Add branch/env picker toolbar and create branch flow

Add git integration: branch picker + worktrees