Retire the Dashboard tab; Processes is the front page

The app repeated itself. The module list, /api/prefs/dashboard, applyPrefs and the
per-user dashboard blob are gone. Widgets stays and now says plainly that it is for
dashboards outside Ham Lab.

This also closes a bug: applyPrefs set the sampling rate from intervalMs inside the
dashboard layout, and reset it to the default when that field was absent — so with
per-user layouts, one account saving a dashboard could reset the sampling rate for the
whole machine. The sampler now has one source.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

PLAN.md

@@ -259,6 +259,23 @@ something long in one, switch away and back, refresh — it's all still there.
   id and its route are gone. A rail order saved before this keeps its shape — `railorder.ts`
   maps the retired `top` to `procs` and drops the duplicate, so the merged page sits where
   Top sat rather than falling to the bottom.
+- **Dashboard retired** — **2026-09-23**, at Mitchell's instruction, the same reasoning that
+  merged Top into Processes: the app repeated itself. The customisable module list is gone
+  (`Dashboard.tsx` deleted), and with it `/api/prefs/dashboard`, `applyPrefs`, and the
+  per-user `dashboard` blob in `state.json`. The Processes tab already shows those numbers
+  on one screen. `fmtBytes`/`fmtRate` moved to `fmt.ts` (Disks, Files and Space use them);
+  `MONITOR_HISTORY` and `seriesOf` went with the page. The default view after login, after
+  switching machines, and when a hub-only page is left behind, is now **Processes**. A saved
+  rail order naming `dashboard` degrades quietly — `orderBy` drops ids with no page.
+  **Widgets stays and says what it is for**: a notice at the top explains these are for
+  dashboards *outside* Ham Lab — Glance, Home Assistant, a wall display — served from
+  `/embed/widget` with a read-only sensor token, not a second copy of the console's screens.
+  **It also closed a real bug.** `applyPrefs` set the machine's sampling rate from
+  `intervalMs` inside the dashboard layout, and its `else` branch reset the sampler to the
+  default whenever that field was absent. Since layouts became per-user, one account saving
+  a dashboard could silently reset the sampling rate for the whole machine, overriding the
+  fleet refresh rate set in Settings. The sampler now has one source: `refreshMs` in the UI
+  prefs, which the hub fans out, remembered per machine as `sampler_ms`.
 - **Skins** — 13 since 2026-09-19 (`themes.ts`: a palette is one `mk(…)` line): Dark,
   Light, Cyberpunk, Retro, **HUD** (hairlines of cyan on near-black, corner ticks, thin
   type), Nord, Gruvbox, Catppuccin + Latte, Dracula, Tokyo Night, Solarized Dark + Light;
@@ -531,18 +548,6 @@ something long in one, switch away and back, refresh — it's all still there.
   `internal/term`); snapshots and clones; and what it does on a host with no virtualisation
   at all, which is every host here today. Worth scoping as its own plan before starting.
 
-- **Deprecate the Dashboard tab** — asked for 2026-09-23, not started. Mitchell: it is nice
-  but the app repeats itself — the same reasoning that merged Top into Processes the same
-  day. Dashboard is the customisable module list (CPU, memory, load, uptime, temps, fans,
-  network, disks, filesystems, UPS) plus custom sensor widgets; the Processes tab shows
-  most of the same numbers on one screen already. **Widgets stays**, reframed: its page should say plainly that the
-  widgets there are for **external dashboards** (Glance, Home Assistant, a wall display)
-  via `/embed/widget` and read-only sensor tokens, not a second copy of this console's own
-  screens. Care needed on the way out: the dashboard layout is per-user in `state.json`
-  (`users.<name>.dashboard`) and carries `intervalMs`, which the server reads in
-  `applyPrefs` to set the sampler — that wiring has to move or the sampling rate loses its
-  source. `dashboard` is also the default view after login and after switching machines.
-
 - **Files explorer: cleanup and ease of use** — asked for 2026-09-23, not started.
   General polish and ease of use. The **Deprecate copyparty**
   item names the heavier pieces (multi-select and bulk actions, folder download, resumable