First step of the dashboard-tab consolidation (#1464): a static menu
page linking to every top-level surface, so the tab strip can later
shed its `→` page-links and the dashboard can graduate Stats/Settings
to their own pages.
- dashboard/src/home.{html,css,js}: a responsive grid of link tiles
(D4SHB04RD, FL0W, L0GS, M4TR1X). Pure portal — no tabbar/SSE. Colours
from the shared theme.css, base typography from common.css. The
Matrix tile is hidden until home.js confirms `matrix_gui_enabled`
(same gating as the dashboard's M4TR1X tab); home.js also fills the
swarm/hive identity line.
- build.mjs: emit home.{html,css,js}.
Served at `/home.html` for now (additive — reachable via the existing
ServeDir, links to surfaces at their current routes). Promoting it to
`/` (and relocating the dashboard to `/dashboard` + wiring `← home`
back-links) is the next step — a route swap that touches hive-c0re's
static router, coordinating with damocles. Deliberately decoupled so
this page ships standalone without conflicting with the in-flight
tabs.js change (#1449/#1451).
Part of #1464.
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