feat(website): add Phokus product site with optimized media pipeline

Single-page marketing site for phokus.jezz.wtf in the website/ pnpm workspace
(React 19 + Vite 7 + Tailwind v4). Sections: Hero, Local-first, Search, Explore
& timeline, Curate, Cleanup, Tech facts, Download. Product-first composition with
a recurring aperture motif (EdgeMark) bleeding off alternating edges.

Screenshots are transcoded to AVIF/WebP at build via vite-imagetools (sharp);
~5.3MB of masters -> ~0.5MB served. Commits only the 7 in-use captures.

website/src/main.tsx

@@ -0,0 +1,13 @@
+import { StrictMode } from "react";
+import { createRoot } from "react-dom/client";
+import { App } from "./App";
+import "./styles/index.css";
+
+const root = document.getElementById("root");
+if (!root) throw new Error("Root element #root not found");
+
+createRoot(root).render(
+  <StrictMode>
+    <App />
+  </StrictMode>,
+);