Zoom the icon pattern in and reduce blur

Scale the background pattern up (background-size 240px -> 340px) and
back off the blur (8px -> 3px) so icons read more clearly.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RvYdJ3os7tumimsLdLu2j9

src/components/ordering/MenuBackdrop.module.scss

@@ -4,8 +4,8 @@
   z-index: -1;
   overflow: hidden;
   pointer-events: none;
-  filter: blur(8px) grayscale(1);
+  filter: blur(3px) grayscale(1);
   opacity: 0.6;
   background-repeat: repeat;
-  background-size: 240px 240px;
+  background-size: 340px 340px;
 }