Extracts the hive-wide turn-stats rollup out of the dashboard tab strip
into a standalone /stats.html page, reached from the H0M3 hub — same
minimal-chrome pattern as /flow.html and /logs.html. The dashboard tab
strip is now purely operational.
- new stats.{html,css,js}; stats.js holds the moved render JS and
fetches /api/stats-hive on load + window change.
- migrate the window selector (#hive-stats-windows) from a bespoke
data-w/.active toggle to the shared createTabStrip — now hash-routed
(#1h / #24h / …) and deep-linkable, matching the per-agent /stats page.
- drop the ST4TS tab + pane from dashboard.html and the hive-stats render
block + the stats->refreshHiveStats lazy-load from tabs.js.
- move the shared .hive-stats-table to common.css (the dashboard SYST3M >
C0NT41N3R L04D table still uses it); the ST4TS-only window/chip/bar
styles go to stats.css.
- add a Stats tile to the H0M3 hub (and drop the now-stale "stats" from
the Dashboard tile desc); wire build.mjs + the nix/frontend.nix manifest.
Second slice of #1464 step 2; follows the /settings.html extraction.
