fix: WebSocket reconnect race, parse error tracking, RPC timeout reduction, vendor chunk split

- F8: Add isReconnecting flag to prevent parallel reconnection attempts
- F9: Track JSON parse errors, force reconnect after 3 consecutive failures
- F11: Reduce RPC timeout to 15s, add jitter to retry backoff
- F12: Add vendor chunk splitting for vue/router/pinia
- F13: DOMPurify already applied to QR SVGs — verified
- F14: Replace O(n) goals alias lookup with Map-based O(1)
- F15: Wrap 7 localStorage.setItem calls in try/catch across 5 stores

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

neode-ui/vite.config.ts

@@ -151,5 +151,12 @@ export default defineConfig({
     // Output to dist for Docker builds, or to ../web/dist/neode-ui for local development
     outDir: process.env.DOCKER_BUILD === 'true' ? 'dist' : '../web/dist/neode-ui',
     emptyOutDir: true,
+    rollupOptions: {
+      output: {
+        manualChunks: {
+          vendor: ['vue', 'vue-router', 'pinia'],
+        }
+      }
+    }
   },
 })