feat(ui): add photo file handling in Vite config

* include new image assets in static/photos
* define __PHOTO_FILES__ for dynamic photo URLs
* update package.json and package-lock.json with @types/node

ui/vite.config.ts

@@ -1,12 +1,23 @@
+import { readdirSync } from 'node:fs';
 import tailwindcss from '@tailwindcss/vite';
 import adapter from '@sveltejs/adapter-static';
 import { sveltekit } from '@sveltejs/kit/vite';
 import { defineConfig } from 'vite';
 
+// Background photos live in static/photos so Vite copies them verbatim
+// (original filenames, no content hash) instead of running them through the
+// module asset pipeline.
+const photoFiles = readdirSync('static/photos').filter((name) =>
+	/\.(jpe?g|png)$/i.test(name)
+);
+
 export default defineConfig({
 	server: {
 		fs: { allow: ['assets'] }
 	},
+	define: {
+		__PHOTO_FILES__: JSON.stringify(photoFiles)
+	},
 	plugins: [
 		tailwindcss(),
 		sveltekit({