Replace vendored twui library with @moduletrace/twui package

- Import all twui layout/elements components and base.css from the
  @moduletrace/twui package instead of src/components/lib
- Move the site's own motion and three modules out of the old lib
  folder into src/components/motion and src/components/three
- Delete the vendored src/components/lib folder and its tsconfig excludes
- Type BlogPostsListCard's post prop with the DB blog post type,
  fixing the type error in BlogPostsList

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/components/motion/use-motion.tsx

@@ -0,0 +1,16 @@
+import React from "react";
+
+/** Boot the site-wide GSAP motion system (see ./motion.ts). */
+export default function useMotion() {
+    React.useEffect(() => {
+        let destroy: (() => void) | undefined;
+        let cancelled = false;
+        import("./motion").then(({ initMotion }) => {
+            if (!cancelled) destroy = initMotion();
+        });
+        return () => {
+            cancelled = true;
+            destroy?.();
+        };
+    }, []);
+}