feat(web): Storybook for offline UI design + light theme + brand spinner

Stand up Storybook so the management console can be designed without a running
host, plus the design-system work that surfaced along the way.

Storybook (@storybook/react-vite):
- Slim Start/Nitro-free vite config; the preview imports the app's real
  src/styles.css directly so the design tokens stay single-sourced (no mirror).
- Stories for the @unom/ui primitives (Button/Card/Inputs/Badge), brand marks,
  the AppShell (throwaway in-memory TanStack router), and every data-driven page
  (Dashboard/Host/Clients/Library/Settings) rendered offline via a window.fetch
  stub + typed fixtures. The route page components are exported so stories can
  render them.

Light theme:
- styles.css now carries a light :root (lavender, from the docs palette) with the
  existing violet chrome moved to .dark; the live console still pins html.dark by
  default, so this only adds the option (Storybook's toolbar toggles it).
- Fixes a stray `*/` inside a comment that prematurely closed it and silently
  broke Tailwind's @theme processing.

Spinner:
- The punktfunk lens recreated with motion/react: two circles surge through one
  another in depth (JS perspective scale + z-index — robust where mix-blend-mode
  flattens CSS preserve-3d) with a screen-blend lens highlight. Replaces the
  skeleton loading state in QueryState; removes ui/skeleton.tsx.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

web/src/routes/clients.tsx

@@ -22,7 +22,8 @@ import { useLocale } from '@/lib/i18n'
 
 export const Route = createFileRoute('/clients')({ component: ClientsPage })
 
-function ClientsPage() {
+// Exported for Storybook (see src/stories) — harmless alongside `Route`.
+export function ClientsPage() {
   useLocale()
   const qc = useQueryClient()
   const clients = useListPairedClients()

web/src/routes/host.tsx

@@ -8,7 +8,9 @@ import { useLocale } from '@/lib/i18n'
 
 export const Route = createFileRoute('/host')({ component: HostPage })
 
-function HostPage() {
+// Exported so Storybook can render the page directly (see src/stories). The
+// route gen only needs the `Route` export; this extra one is harmless.
+export function HostPage() {
   useLocale()
   const host = useGetHostInfo()
   const compositors = useListCompositors()

web/src/routes/index.tsx

@@ -15,7 +15,8 @@ import { useLocale } from '@/lib/i18n'
 
 export const Route = createFileRoute('/')({ component: Dashboard })
 
-function Dashboard() {
+// Exported for Storybook (see src/stories) — harmless alongside `Route`.
+export function Dashboard() {
   useLocale()
   const qc = useQueryClient()
   // Poll live status every 2s so the console tracks an active session.

web/src/routes/library.tsx

@@ -66,7 +66,8 @@ function toInput(f: FormState): CustomInput {
   }
 }
 
-function LibraryPage() {
+// Exported for Storybook (see src/stories) — harmless alongside `Route`.
+export function LibraryPage() {
   useLocale()
   const qc = useQueryClient()
   const library = useGetLibrary()

web/src/routes/settings.tsx

@@ -7,7 +7,8 @@ import { useLocale, changeLocale, locales, type Locale } from '@/lib/i18n'
 
 export const Route = createFileRoute('/settings')({ component: SettingsPage })
 
-function SettingsPage() {
+// Exported for Storybook (see src/stories) — harmless alongside `Route`.
+export function SettingsPage() {
   const current = useLocale()
 
   const onLogout = async () => {