fix(web): make local/new worktree a real toggle

[binbandit]

Summary

• replace the branch toolbar mode button with a real two-state toggle for Local and New worktree
• keep the selected mode visible when the environment is locked or already attached to a worktree
• add a focused browser test for the toggle interaction and locked-state rendering

Validation

• bun fmt
• bun lint
• bun typecheck
• cd apps/web && bun run test
• cd apps/web && bun run test:browser src/components/BranchToolbar.browser.tsx

Before and After

Before

After

Note

Replace environment mode button with a segmented 'Local'/'New worktree' toggle in BranchToolbar

• BranchToolbar.tsx replaces a single ghost button with a ToggleGroup containing 'Local' and 'New worktree' options, making the environment mode selection a true two-way toggle.
• The active toggle reflects effectiveEnvMode; clicking the other option calls onEnvModeChange('local' | 'worktree'). When a worktree is already active, the label changes to 'Worktree' and both toggles are disabled.
• extendReplacementRangeForTrailingSpace is extracted from ChatView.tsx into ChatView.logic.ts and re-exported to avoid duplication.
• Browser tests added in BranchToolbar.browser.tsx covering the editable and locked states.

^{Macroscope summarized 837abe6.}

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[juliusmarminge]

sorry but this looks awful:

[binbandit]

Closing in favour of #1001