Import Tripoli Cloud frontend prototype

React/TypeScript/Vite/Tailwind prototype from the design session (login,
dashboard, photos, backups, settings views with mocked API layer).
Infra work (Rust services, Ansible, OpenTofu) follows in subsequent commits.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

app/src/components/dashboard/StatCard.tsx

@@ -0,0 +1,23 @@
+import type { StatItem } from '../../types';
+import { DataIcon } from '../icons/DataIcon';
+
+const TONE_CLASSES: Record<StatItem['tone'], string> = {
+  brand: 'bg-selected text-brand-soft',
+  success: 'bg-success/16 text-success',
+  violet: 'bg-violet/16 text-violet',
+};
+
+export function StatCard({ stat }: { stat: StatItem }) {
+  return (
+    <div className="rounded-2xl border border-line bg-panel p-[18px] backdrop-blur-md">
+      <div className="mb-3.5 flex items-center justify-between gap-2.5">
+        <span className="text-[12.5px] font-semibold text-ink-soft">{stat.label}</span>
+        <span className={`flex h-7 w-7 items-center justify-center rounded-[9px] ${TONE_CLASSES[stat.tone]}`}>
+          <DataIcon name={stat.icon} size={15} />
+        </span>
+      </div>
+      <p className="m-0 mb-1 text-[27px] font-extrabold tracking-tight text-ink">{stat.value}</p>
+      <p className="m-0 text-xs text-ink-soft">{stat.note}</p>
+    </div>
+  );
+}