fix: mobilni header odseknuty - padding-top prepsany !important

padding: 12px !important v @media max-width 480px prepisoval padding-top
pro fixed header offset. Pridan explicitni padding-top s header vyskou.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/admin/admin.css

@@ -2242,6 +2242,7 @@ img {
 
   .admin-content {
     padding: 12px !important;
+    padding-top: calc(73px + 12px + env(safe-area-inset-top, 0px)) !important;
   }
 
   .admin-card-body {