Update beta flyer styles: Adjust feature gap to 1.8mm and line height to 1.28 for improved layout consistency. Update PDF file to reflect changes.

docs/marketing/beta-flyer.html

@@ -147,7 +147,7 @@
     .features {
       display: grid;
       grid-template-columns: 1fr 1fr;
-      gap: 2.5mm 6mm;
+      gap: 1.8mm 6mm;
       flex-shrink: 0;
       position: relative;
       z-index: 1;
@@ -158,7 +158,7 @@
       gap: 2.5mm;
       align-items: flex-start;
       font-size: 10.5pt;
-      line-height: 1.4;
+      line-height: 1.28;
       color: #e2e8f0;
     }