fix: Vercel SPA rewrite for /detail route

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/src/lib/dualMonitor.ts

@@ -40,8 +40,10 @@ export function openDetailWindow(): Window | null {
   const screenH = window.screen.height;
   const rightMonitorLeft = window.screenX + screenW;
 
+  const detailUrl = `${window.location.origin}/detail`;
+
   detailWindow = window.open(
-    '/detail',
+    detailUrl,
     DETAIL_WINDOW_NAME,
     `width=${screenW},height=${screenH},left=${rightMonitorLeft},top=0,resizable=yes,scrollbars=yes`,
   );

frontend/vercel.json

@@ -0,0 +1,5 @@
+{
+  "rewrites": [
+    { "source": "/(.*)", "destination": "/index.html" }
+  ]
+}