Switch from rollup to vite

Vue plugin with Rollup typescript plugin only worked when rollup-plugin-typescript2 was used, but this plugin was broken in watch mode, where old code was cached and doesn't update, unless the watch mode was restarted: ezolenko/rollup-plugin-typescript2#433 (comment)

Author: patrick11514

frontend/.gitignore

@@ -1,4 +1,6 @@
 /node_modules/
-/public/build/
 
 .DS_Store
+
+# Vite timestamp files
+vite.config.mjs.*