Fix all TypeScript errors; remove unused element/magicui components

- Add missing deps: @base-ui/react, react-hook-form, next-themes, react-is
- Bump recharts to 3.9.1 and update chart.tsx to the recharts v3-compatible
  shadcn version
- Pin react-resizable-panels to v3 (v4 renamed the PanelGroup exports)
- Add showCloseButton prop to DialogContent (used by CommandDialog)
- Replace custom cn with standard clsx + twMerge (fixes Base UI className
  types and object-syntax classes being dropped at runtime)
- Clean up tsconfig (drop dead Vite project references; Next.js updated
  moduleResolution/jsx during build)
- Remove unused components/elements and components/magicui, drop bun.lock
  in favor of yarn.lock, simplify app/page.tsx

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019bE5ox6WnAPgqRgkx3pLCu

app/page.tsx

@@ -1,16 +1,11 @@
-import { Typography } from "@/components/elements/Typography"
-
 const Home: React.FC = () => {
   return (
     <div className="flex items-center justify-center w-full h-screen">
-      <Typography
-        variant="h1"
-        textAlign="center"
-        text="Start prompting"
-        className="text-6xl font-bold font-heading text-black"
-      />
+      <h1 className="text-3xl font-bold font-heading text-black text-center">
+        Start prompting
+      </h1>
     </div>
   )
 }
 
-export default Home
+export default Home