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/js/components/ThemeSwitcher.js

@@ -1,36 +0,0 @@
-const ThemeSwitcher = {
-  currentTheme: "light",
-
-  init() {
-    if (
-      localStorage.theme === "dark" ||
-      (typeof window.matchMedia != "undefined" &&
-        window.matchMedia("(prefers-color-scheme: dark)").matches &&
-        localStorage.theme !== "light")
-    ) {
-      this.toggleTheme();
-    }
-
-    document.addEventListener("turbolinks:load", () => this.initButton());
-  },
-
-  initButton() {
-    let themeSwitcher = document.getElementById("theme-switcher");
-
-    themeSwitcher?.addEventListener("click", () => this.toggleTheme());
-  },
-
-  toggleTheme() {
-    if (this.currentTheme === "light") {
-      this.currentTheme = "dark";
-      document.documentElement.classList.add("dark");
-    } else {
-      this.currentTheme = "light";
-      document.documentElement.classList.remove("dark");
-    }
-
-    localStorage.setItem("theme", this.currentTheme);
-  },
-};
-
-export { ThemeSwitcher as default };