restructure to root, add tuner from jms

vite.config.js

@@ -0,0 +1,13 @@
+import { defineConfig } from 'vite'
+import react from '@vitejs/plugin-react'
+
+export default defineConfig({
+  plugins: [react()],
+  base: './',   // relative paths so Electron can load files from disk
+  server: {
+    port: 5173,
+  },
+  build: {
+    outDir: 'dist',
+  },
+})