Import project configuration: app/vite.config.js

Import the existing local project snapshot. This commit organizes existing files; it does not represent newly developed functionality.

app/vite.config.js

@@ -0,0 +1,52 @@
+import { defineConfig } from 'vite';
+import react from '@vitejs/plugin-react';
+
+// Vite config: bundles React + JSX at build time (no CDN, no Babel-Standalone),
+// emits hashed assets, copies /public/* (incl. fonts) to dist/.
+export default defineConfig({
+  root: '.',
+  publicDir: 'public',
+  server: {
+    port: 3009,
+    host: '0.0.0.0',
+    strictPort: true,
+    proxy: {
+      // Forward /api/* to the Fastify backend so the browser sees same-origin
+      // cookies in dev. Production goes through Caddy with the same path-based
+      // routing — the frontend code never needs to know which is in use.
+      '/api': {
+        target: 'http://localhost:3010',
+        changeOrigin: false,
+      },
+    },
+  },
+  preview: { port: 3009, host: '0.0.0.0', strictPort: true },
+  build: {
+    outDir: 'dist',
+    sourcemap: true,
+    target: 'es2020',
+    cssCodeSplit: true,
+    // Keep imported icon SVGs as real hashed files (never base64-inlined) so they
+    // serve from /assets/ with gzip_static/brotli_static and CSS mask URLs stay clean.
+    assetsInlineLimit(filePath) {
+      if (filePath.includes('assets/icons/')) return false;
+      // any other asset → Vite's default size-based inlining
+    },
+    rollupOptions: {
+      input: {
+        main: 'index.html',
+        embed: 'embed.html',
+      },
+      output: {
+        // Group React separately so the vendor bundle is cacheable across deploys.
+        manualChunks(id) {
+          if (id.includes('node_modules/react')) return 'vendor-react';
+          if (id.includes('node_modules/three')) return 'vendor-three';
+          if (id.includes('node_modules/d3') || id.includes('node_modules/d3-')) return 'vendor-d3';
+          if (id.includes('node_modules')) return 'vendor';
+        },
+      },
+    },
+  },
+  plugins: [react()],
+});