#3 Back buttons: HubShell now renders a top-left "‹ Back" on each detail page
(/word /quote /onthisday). It mirrors the News reader's rule — if you arrived by
an in-app navigation, history.back() returns you to the hub with state/scroll
intact (and the browser Back button traverses the same single history); a direct
deep-link has no app history, so it falls back to goto('/home3'). Opt-out via
back={false}; relabel via backLabel.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
thejayman77
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