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/_gameboard.scss

@@ -46,6 +46,19 @@ body.page-gameboard {
     }
 }
 
+@media (orientation: landscape) and (max-width: 1023px) {
+    // Restore clip in landscape — overrides the >738px overflow:visible above,
+    // preventing the gameboard applets from bleeding into the footer sidebar.
+    body.page-gameboard .container {
+        overflow: clip;
+    }
+    // Reset the 666px min-width so gameboard-page shrinks to fit within the
+    // sidebar-bounded container rather than overflowing into the footer sidebar.
+    .gameboard-page {
+        min-width: 0;
+    }
+}
+
 #id_applet_game_kit {
     display: flex;
     flex-direction: column;