Implement approved plans in new worktrees

[Mitch515]

What Changed

• add a UI flow for taking an approved plan and starting implementation in a new worktree
• wire the approved-plan action into the existing chat and plan UI flow
• add supporting behavior needed for the new-worktree implementation path

Why

• approving a plan should lead directly into isolated implementation without requiring manual worktree setup first
• the plan UI becomes more useful when it can hand off into the next concrete step

UI Changes

• screenshots and video are attached in the PR asset comment

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes, if applicable

Note

Implement approved plans in new git worktrees from ChatView

• Adds an 'Implement in new worktree' option to the plan implementation menu in ChatView.tsx, creating a new git worktree from the current branch before starting the implementation thread.
• Sequences worktree creation, optional setup script execution, thread creation, and navigation via a new startImplementationThread helper; cleans up orphaned threads if later steps fail.
• On failure after worktree creation, shows an AlertDialog offering to keep or delete the partially created worktree, with delete triggering api.git.removeWorktree and a git query invalidation.
• Extends the browser test harness in ChatView.browser.tsx with per-tag WS RPC overrides and adds three test cases covering menu visibility, successful worktree creation, and rollback UI on failure.
• Risk: startImplementationThread error handling depends on cleanupImplementationThreadCreation succeeding silently; if the orchestration dispatch also fails, the thread may still be orphaned.

^{Macroscope summarized f0f98a1.}

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[Mitch515]

Assets for review:

Implementation actions screenshot:

Muted video:

• plan-implementation-worktrees.mp4