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 <[email protected]>

dev/check-prefix.sh

@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+# The server honours X-Forwarded-Prefix and mounts a PathBase
+# (DnsWebService.cs:1943-1945). This check simulates that proxy and verifies the
+# bundle is requested relatively, not absolutely.
+set -euo pipefail
+
+PREFIX="/dns"
+BASE="http://127.0.0.1:5380"
+
+html=$(curl -s -H "X-Forwarded-Prefix: ${PREFIX}" -H "X-Forwarded-Proto: https" "${BASE}/")
+
+paths=$(echo "$html" | grep -oE '(src|href)="[^"]+"' | sed -E 's/^(src|href)="//; s/"$//')
+
+echo "Emitted paths:"
+echo "$paths" | sed 's/^/  /'
+
+if echo "$paths" | grep -q '^/'; then
+  echo "FAILED: there are absolute paths. Behind a proxy at ${PREFIX} the browser would request them outside the prefix and they would 404."
+  exit 1
+fi
+
+echo "OK: every path is relative; they survive a prefixed proxy."