ensured footer was pinned to bottom of page for new-ish billboard.html & room_scroll.html pages; introduced mobile landscape layout, incl. leftward 'navbar', rightward 'footer'; ensured z-index primacy of #id_kit_btn, which would here appear behind the kit bar when open; other fixes introduced by problems stemming largely from new landscape styling

src/static_src/scss/_dashboard.scss

@@ -153,6 +153,14 @@ body.page-dashboard {
     }
 }
 
+@media (orientation: landscape) and (max-width: 1023px) {
+    // Reset the 666px min-width so #id_dash_content shrinks to fit within the
+    // sidebar-bounded container rather than overflowing into the footer sidebar.
+    #id_dash_content {
+        min-width: 0;
+    }
+}
+
 @media (max-height: 500px) {
     body.page-dashboard {
         .container {