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>

public/fonts/README.md

@@ -0,0 +1,34 @@
+# The console's fonts
+
+- **Archivo** (Omnibus-Type) for the text, variable 300-700 (`OFL-Archivo.txt`)
+- **IBM Plex Mono** for the data, weights 400 and 600 (`OFL-IBMPlex.txt`)
+
+Both under the SIL Open Font License 1.1, which allows packaging and
+redistributing them with the software. **65 KB in total.**
+
+## Why they live here and not on a CDN
+
+The server's CSP is `default-src 'self'` with no `font-src`
+(`DnsServerCore/DnsWebService.cs:1969-1974`): any font that does not come from
+the origin itself is blocked. They have to travel inside `www/`.
+
+## Why these two
+
+The console used the operating system's font, and that is the underlying reason
+it read as correct but anonymous: the same letterform as everything else, and a
+different one on every machine.
+
+Inter and Geist were ruled out on purpose. Both are excellent and both are
+everywhere (Inter is NetBird's, Geist is Vercel's), so using them would have been
+swapping one borrowed font for another.
+
+**Archivo** is a slightly narrowed grotesque with marked verticals: it has
+presence at small sizes, which is where a zone table is read, and a technical
+product character that belongs to nobody else.
+
+**Plex Mono** is half of what this console shows (domains, addresses, serials,
+TTLs), and there what matters is that the figures cannot be confused: slashed
+zero, one with a base, unmistakable l and 1. On a DNS that is not a typographic
+detail, it is reading an address correctly.
+
+Downloaded from the `latin` subset Google Fonts publishes.