sig-select landscape: stage card now visible; gear/kit btns in right sidebar column

sizeSigModal() no longer uses tray bottomInset in landscape (was over-shrinking the
modal, pushing the stage off-screen); fixed 60px kit-bag-handle clearance instead.
Gear btn + kit btn shifted into the 4rem right sidebar strip (right: 0.5rem) and
nudged down a quarter-rem so they clear the last card in the 9×2 grid.

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

src/static_src/scss/_applets.scss

@@ -119,8 +119,8 @@
     .room-page,
     .billboard-page {
         > .gear-btn {
-            right: calc(#{$sidebar-w} + 0.5rem);
-            bottom: 4.2rem;     // same gap above kit btn as portrait; no page-specific overrides needed
+            right: 0.5rem;
+            bottom: 3.95rem;    // same gap above kit btn as portrait; no page-specific overrides needed
             top: auto;
         }
     }