chore: editor store, graph, and vite config updates

vite.config.ts

@@ -1,6 +1,7 @@
 import { defineConfig } from 'vite'
 import vue from '@vitejs/plugin-vue'
 import { resolve } from 'path'
+import fs from 'fs'
 
 export default defineConfig({
   plugins: [vue()],
@@ -18,4 +19,30 @@ export default defineConfig({
       },
     },
   },
+  server: {
+    configureServer(server) {
+      server.middlewares.use('/api/save', (req, res) => {
+        if (req.method !== 'POST') { res.writeHead(405); res.end(); return }
+        let body = ''
+        req.on('data', (c: string) => body += c)
+        req.on('end', () => {
+          try {
+            const { path, data } = JSON.parse(body)
+            if (!path || typeof path !== 'string' || !path.startsWith('/scenes/')) {
+              res.writeHead(400)
+              res.end(JSON.stringify({ error: 'invalid path' }))
+              return
+            }
+            const safePath = resolve(__dirname, 'public', '.' + path)
+            fs.writeFileSync(safePath, JSON.stringify(data, null, 2))
+            res.writeHead(200, { 'Content-Type': 'application/json' })
+            res.end(JSON.stringify({ ok: true }))
+          } catch (e: any) {
+            res.writeHead(400)
+            res.end(JSON.stringify({ error: e.message }))
+          }
+        })
+      })
+    },
+  },
 })