perf: expand manual chunks — add react/router, calendar, xyflow vendor splits

index bundle: 1565kB → 1085kB (under 1500kB target)
Chunks: vendor-react 163kB, vendor-calendar 274kB, vendor-xyflow 181kB added.

vite.config.ts

@@ -117,6 +117,20 @@ export default defineConfig(({ mode }) => {
     build: {
       outDir: 'dist',
       sourcemap: mode === 'development',
+      rollupOptions: {
+        output: {
+          manualChunks: {
+            'vendor-react':    ['react', 'react-dom', 'react-router-dom'],
+            'vendor-tldraw':   ['@tldraw/tldraw', '@tldraw/state', '@tldraw/store'],
+            'vendor-mui':      ['@mui/material', '@mui/icons-material', '@emotion/react', '@emotion/styled'],
+            'vendor-supabase': ['@supabase/supabase-js'],
+            'vendor-calendar': ['@fullcalendar/core', '@fullcalendar/daygrid', '@fullcalendar/interaction',
+                                '@fullcalendar/list', '@fullcalendar/multimonth', '@fullcalendar/react',
+                                '@fullcalendar/timegrid'],
+            'vendor-xyflow':   ['@xyflow/react'],
+          },
+        },
+      },
     },
 
     resolve: {