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/images.d.ts

@@ -0,0 +1,9 @@
+// Typing for vite-imagetools `?as=picture` imports. The query ends in `as=picture`,
+// so this wildcard matches each screenshot import. Shape mirrors imagetools' Picture.
+declare module "*as=picture" {
+  const picture: {
+    sources: Record<string, string>;
+    img: { src: string; w: number; h: number };
+  };
+  export default picture;
+}