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>

vitest.config.ts

@@ -0,0 +1,19 @@
+import { readFileSync } from 'node:fs'
+import { defineConfig } from 'vitest/config'
+import react from '@vitejs/plugin-react'
+
+/* The build injects this from package.json (see vite.config.ts). The tests run
+   through a different config, so it has to be injected here as well or anything
+   that reports the console's own version throws. */
+const version = JSON.parse(readFileSync(new URL('./package.json', import.meta.url), 'utf8')).version
+
+export default defineConfig({
+  plugins: [react()],
+  resolve: { alias: { '@': new URL('./src', import.meta.url).pathname.replace(/^\/([A-Za-z]:)/, '$1') } },
+  define: { __CONSOLE_VERSION__: JSON.stringify(version) },
+  test: {
+    environment: 'jsdom',
+    globals: true,
+    setupFiles: ['./src/test/setup.ts'],
+  },
+})