Move the console onto ReUI PRO

Install ReUI (MCP, skill, @reui registry, Tailwind v4, shadcn base-nova) and move
the shared UI onto it: Button, Tag, Check, Input/Textarea, Segmented, Alert, Panel,
Dialog, Tooltip, Menu and Select (Popover), Toast (sonner), the Table frame
(DataGrid), the Dashboard KPI strip, the shnt Ops palette, Geist and the type scale.

Design only: behaviour, texts and roles are unchanged. Tests that asserted the old
DOM were updated; the tests now format numbers in English wherever they run.
docs/reui-migration-plan.md records the plan and its decisions.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

dev/update-check-serve.mjs

@@ -0,0 +1,52 @@
+/**
+ * The update check (`update-check/`), served from this machine for the harness.
+ *
+ * Cloudflare runs it in production. Here it runs under Node, with the same
+ * handler, so that the harness's DNS server can be pointed at it:
+ * `http://<docker gateway>:8853/dns-query`.
+ *
+ * `UPDATE_CHECK_FAKE='v=1 latest=9.9.9 server=15.5'` answers that record instead
+ * of reading GitHub, to see the console's notice without a real release.
+ *
+ * Run it with `node --experimental-strip-types dev/update-check-serve.mjs`.
+ */
+import { createServer } from 'node:http'
+import { handle, lookup } from '../update-check/src/handler.ts'
+
+const PORT = 8853
+
+function fakeRelease(text) {
+  const fields = Object.fromEntries(text.split(' ').map((pair) => pair.split('=')))
+  return { latest: fields.latest, server: fields.server }
+}
+
+const memory = new Map()
+const store = {
+  async get(key) {
+    const hit = memory.get(key)
+    return hit && hit.until > Date.now() ? hit.value : null
+  },
+  async put(key, value, ttlSeconds) {
+    memory.set(key, { value, until: Date.now() + ttlSeconds * 1000 })
+  },
+}
+
+const fake = process.env.UPDATE_CHECK_FAKE
+const find = fake ? async () => fakeRelease(fake) : () => lookup(fetch, store)
+
+createServer((req, res) => {
+  const chunks = []
+  req.on('data', (chunk) => chunks.push(chunk))
+  req.on('end', async () => {
+    const url = new URL(req.url ?? '/', `http://${req.headers.host}`)
+    if (url.pathname !== '/dns-query') {
+      res.writeHead(404).end()
+      return
+    }
+    const body = req.method === 'POST' ? Buffer.concat(chunks) : undefined
+    const response = await handle(new Request(url, { method: req.method, headers: req.headers, body }), find)
+    res.writeHead(response.status, Object.fromEntries(response.headers))
+    res.end(Buffer.from(await response.arrayBuffer()))
+    console.log(new Date().toISOString(), req.method, response.status)
+  })
+}).listen(PORT, '0.0.0.0', () => console.log(`update check on :${PORT}${fake ? ` (fake: ${fake})` : ''}`))