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- Linux (and any non-desktop platform): refuse instead of 'pkill claude', which substring-matched running Claude Code CLI sessions and relaunched the CLI, not a desktop app. New restart_supported() gates the button. - macOS: wait (<=5s) for the old instance to exit before 'open -a Claude' so the relaunch can't re-activate the dying process. Runs off the UI thread via a RestartWorker. - Windows: verify the Start-menu shortcut exists BEFORE taskkill, so an MSIX/Store install is never killed without a relaunch path. Closes #33 Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>