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

tsconfig.json

@@ -1,17 +1,10 @@
 {
-  "files": [],
-  "references": [
-    {
-      "path": "./tsconfig.app.json"
-    },
-    {
-      "path": "./tsconfig.node.json"
-    }
-  ],
   "compilerOptions": {
     "baseUrl": ".",
     "paths": {
-      "@/*": ["./*"]
+      "@/*": [
+        "./*"
+      ]
     },
     "target": "ES2017",
     "lib": [
@@ -27,10 +20,10 @@
     "incremental": true,
     "module": "esnext",
     "esModuleInterop": true,
-    "moduleResolution": "node",
+    "moduleResolution": "bundler",
     "resolveJsonModule": true,
     "isolatedModules": true,
-    "jsx": "preserve",
+    "jsx": "react-jsx",
     "plugins": [
       {
         "name": "next"
@@ -41,7 +34,8 @@
     "next-env.d.ts",
     ".next/types/**/*.ts",
     "**/*.ts",
-    "**/*.tsx"
+    "**/*.tsx",
+    ".next/dev/types/**/*.ts"
   ],
   "exclude": [
     "node_modules"