fixed several animation & transition problems plaguing the inventory tray

src/static_src/scss/_room.scss

@@ -473,6 +473,16 @@ html:has(.gate-backdrop) .position-strip .gate-slot button { pointer-events: aut
     justify-content: center;
 }
 
+// Outside .room-table-scene so it isn't scaled by scaleTable().
+// Positioned absolute so it floats over the hex without affecting flex layout.
+#id_pick_sigs_wrap {
+    position: absolute;
+    top: 50%;
+    left: 50%;
+    transform: translate(-50%, -50%);
+    z-index: 10;
+}
+
 .table-center {
     display: flex;
     align-items: center;