fix: widget modal — clean embed mode, better close button, backdrop blur

- ?embed=true renders widget without page wrapper (white bg, no padding)
- widget-loader.js appends &embed=true to modal URL automatically
- Close button is now inside dialog (not overlapping iframe), light style
- Backdrop blur effect, Escape key closes modal
- FAB: subtle translateY on hover instead of scale

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/pages/BookingWidgetStandalonePage.tsx

@@ -75,6 +75,22 @@ export function BookingWidgetStandalonePage() {
   }, [slug])
 
   const isFullWidth = searchParams.get('width') === 'full'
+  const isEmbed = searchParams.get('embed') === 'true'
+
+  if (isEmbed) {
+    return (
+      <div className="w-full bg-white">
+        <WidgetPreview
+          settings={settings}
+          slug={slug}
+          realRooms={realRooms.length > 0 ? realRooms : undefined}
+          realCategories={realCategories.length > 0 ? realCategories : undefined}
+          realRentalObjects={realRentalObjects.length > 0 ? realRentalObjects : undefined}
+          paymentEnabled={paymentEnabled}
+        />
+      </div>
+    )
+  }
 
   return (
     <div className={isFullWidth ? 'min-h-screen bg-slate-50' : 'min-h-screen bg-slate-50 flex items-start justify-center py-6 px-3'}>