fix(welcome): keep network strip from widening the hero grid

Grid items default to min-width: auto, so the 5×220px scroll strip
forced the 1.2fr column to its intrinsic width and pushed the right
column out. min-width: 0 lets the track shrink and overflow-x scroll.

src/components/WelcomeWorld.vue

@@ -1506,6 +1506,10 @@ main {
   }
 }
 
+.hero-ed-left {
+  min-width: 0;
+}
+
 .hero-ed-right {
   display: flex;
   justify-content: center;