[Glitch] Fix layout of the report page on smaller screens in admin UI

Port f53e4c250e to glitch-soc

Signed-off-by: Claire <claire.github-309c@sitedethib.com>

app/javascript/flavours/glitch/styles/admin.scss

@@ -1203,6 +1203,10 @@ a.sparkline {
       }
     }
   }
+
+  @media screen and (max-width: 930px) {
+    grid-template-columns: minmax(0, 1fr);
+  }
 }
 
 .account-card {