Carves the dashboard's SYST3M tab content out into a standalone page at
/core.html, reached from the H0M3 hub, with a createTabStrip sub-tab
strip (default = Rebuild Queue): rebuild queue, meta inputs, kept state,
container load. Same minimal-chrome standalone-page pattern as
/logs.html (← home back-link + sub-tab nav).
This is the additive first step: the new page is its own esbuild bundle
that cold-loads /api/state and subscribes to /dashboard/stream for the
same live rebuild_queue_changed / meta_inputs_changed / meta_update_running
/ tombstones_changed events the dashboard uses. The four section
renderers are ported from tabs.js; the dashboard's SYST3M tab is left in
place and untouched, so this PR cannot regress the existing dashboard.
Removing the now-duplicate SYST3M tab + de-duplicating the renderers
(into a shared module) + splitting the shared section CSS out of
dashboard.css is the deliberate follow-up.
core.css imports dashboard.css wholesale (transitional) so the ported
sections render identically; dashboard.css does not import common.css so
nothing double-loads. build.mjs gains core.js / core.css / core.html
entries; no Rust change (hive-c0re serves dist/ via ServeDir, and the
/dashboard/stream + /dashboard/history routes are registered ahead of
the fallback).
Page name "C0R3" is a placeholder pending the operator's pick — trivially
renamed (the /core.html URL + the C0R3 label).
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