docs: add minimalist UI design spec

Covers Tailwind CSS setup, dark mode via next-themes, flag image language
switcher, SEO metadata + JSON-LD, and full layout for home and status pages.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/app/page.tsx

@@ -0,0 +1,10 @@
+import { SubmitForm } from '@/components/SubmitForm'
+
+export default function Home() {
+  return (
+    <main style={{ padding: '2rem' }}>
+      <h1>Ombrora</h1>
+      <SubmitForm />
+    </main>
+  )
+}

src/app/status/[uuid]/page.tsx

@@ -0,0 +1,15 @@
+import { StatusView } from '@/components/StatusView'
+
+export default async function StatusPage({
+  params,
+}: {
+  params: Promise<{ uuid: string }>
+}) {
+  const { uuid } = await params
+  return (
+    <main style={{ padding: '2rem' }}>
+      <h1>Statut du telechargement</h1>
+      <StatusView uuid={uuid} />
+    </main>
+  )
+}