fix: focus paths textbox after selecting recent path

[vforsh]

Summary

• keep existing recent-path append behavior unchanged
• after selecting a recent path, move focus to the paths textarea and place the caret at the end
• add a jsdom test that covers focus and caret placement after recent-path click

Validation

• npm run test -- src/features/workspaces/components/MobileRemoteWorkspacePrompt.test.tsx
• npm run typecheck

[Dimillian]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. 🎉

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