Replaces the agent stats page's bespoke window-tab click handler with the
shared createTabStrip (@hive/shared/tabs.js). The selector is now
hash-routed — #1h / #24h / … become deep-linkable and survive
back/forward navigation.
- window buttons use data-tab (was data-w); the strip resolves them by
that convention and toggles .hive-tab--active + aria-selected.
- onShow(w) sets currentWindow + reloads stats; the strip's initial show
fires it once, so the explicit loadStats() in DOMContentLoaded is
dropped (avoids a double fetch).
- the selector keeps its distinct pill look — agent.css now targets
.window-tabs button.hive-tab--active (was .active), not the shared
.hive-tab text-tab base. It's a pure data-selector with no panes;
createTabStrip skips the absent [data-tab-pane] gracefully.
Behaviour-preserving; aria-selected is now standardised on the buttons.
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