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/styles/globals.css

@@ -1,4 +1,4 @@
-@import "../components/lib/base.css";
+@import "@moduletrace/twui/base.css";
 
 :root {
     --header-height: 78px;
@@ -104,7 +104,7 @@
     @apply opacity-20 my-6;
 }
 
-/* ---- Motion system (see src/components/lib/motion/motion.ts) ---- */
+/* ---- Motion system (see src/components/motion/motion.ts) ---- */
 html.motion:not(.motion-fallback) [data-reveal],
 html.motion:not(.motion-fallback) [data-reveal-stagger] > * {
     visibility: hidden;