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)

components/dashboard/ContentStats.tsx

@@ -115,7 +115,7 @@ export default function ContentStats({ topPages, entryPages, exitPages, domain,
               </button>
             )}
           </div>
-          <div className="flex gap-1" role="tablist" aria-label="Pages view tabs" onKeyDown={handleTabKeyDown}>
+          <div className="flex gap-1 overflow-x-auto scrollbar-hide" role="tablist" aria-label="Pages view tabs" onKeyDown={handleTabKeyDown}>
             {(['top_pages', 'entry_pages', 'exit_pages'] as Tab[]).map((tab) => (
               <button
                 key={tab}