convert codebase to typescript + introduce biome lint

src/ifctester/webapp/vite.config.js

@@ -1,7 +1,7 @@
 import tailwindcss from '@tailwindcss/vite';
 import { defineConfig } from 'vite';
 import { svelte } from '@sveltejs/vite-plugin-svelte';
-import path from "path";
+import path from "node:path";
 
 export default defineConfig({
     plugins: [tailwindcss(), svelte()],
@@ -11,4 +11,4 @@ export default defineConfig({
             $src: path.resolve("./src"),
         },
     },
-});
+});