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 single env mode button in BranchToolbar with a Local/New worktree segmented toggle

• Replaces the previous single Button or static span with a ToggleGroup containing two Toggle controls labeled 'Local' and 'New worktree' (changing to 'Worktree' when a worktree is already active).
• Both toggles are disabled when envLocked is true or a worktree is already active; onEnvModeChange fires only when a different valid mode is selected.
• Adds FolderIcon and GitBranchPlusIcon inside icon chips for visual differentiation.
• Adds browser-based Vitest tests in BranchToolbar.browser.tsx covering toggle rendering and disabled state when envLocked is set.

^{Macroscope summarized 198c5e8.}

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