Migrate JavaScript to TypeScript with full type safety

- Rename all .js/.jsx files to .ts/.tsx across resources/js and theme dirs
- Add TypeScript 6.0 with strict mode, tsconfig.json
- Add type definitions for Inertia page props, Alpine.js, Turbolinks
- Update vite.config.js entries to .ts/.tsx extensions
- Update all Blade @vite() calls to match new .ts/.tsx entry points
- Add TypeScript ESLint config (replacing unused Vue plugin)
- Add @types/react, @types/react-dom, @types/lodash
- Add typecheck script and integrate into check pipeline
- Full tsc --noEmit, ESLint, and production build pass cleanly

resources/themes/atom/views/client/nitro.blade.php

@@ -9,7 +9,7 @@
 
  <link href="https://fonts.googleapis.com/css2?family=Ubuntu+Condensed&display=swap" rel="stylesheet">
 
- @vite(['resources/themes/' . setting('theme') . '/css/app.css', 'resources/themes/' . setting('theme') . '/js/app.js'], 'build')
+ @vite(['resources/themes/' . setting('theme') . '/css/app.css', 'resources/themes/' . setting('theme') . '/js/app.ts'], 'build')
 
  <style>
  :root {