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/js/ssr.jsx

@@ -1,12 +0,0 @@
-import { createInertiaApp } from '@inertiajs/react'
-import { createRoot } from 'react-dom/client'
-
-createInertiaApp({
-  resolve: name => {
-    const pages = import.meta.glob('./pages/**/*.jsx', { eager: true })
-    return pages[`./pages/${name}.jsx`]
-  },
-  setup({ el, App, props }) {
-    createRoot(el).render(<App {...props} />)
-  },
-})