fix: mobile responsiveness across all pages

- SiteNav: add horizontal scroll for 8 tabs on mobile
- NotificationCenter: full-width dropdown on mobile
- ContentStats/Locations/TechSpecs: scrollable tab bars
- FrustrationTable: fix selector text overflow
- FrustrationByPageTable: horizontal scroll on mobile
- CDN: better stat card grid breakpoints
- Home: reduce stat card height, prevent button wrap
- Billing: shorter invoice labels on mobile
- Bump @ciphera-net/ui to 0.2.6 (AppLauncher mobile fix)

styles/globals.css

@@ -82,6 +82,15 @@
     transform-style: preserve-3d;
   }
 
+  /* * Scrollbar hide - for horizontal scroll navs */
+  .scrollbar-hide {
+    -ms-overflow-style: none;
+    scrollbar-width: none;
+  }
+  .scrollbar-hide::-webkit-scrollbar {
+    display: none;
+  }
+
   /* * Animations */
   @keyframes float {
     0%, 100% { transform: translateY(0px); }