feat(lab): separate current increment from rolling map

apps/control-station/src/styles/m4-replay-threat.css

@@ -103,6 +103,12 @@
   background: rgb(var(--nodedc-warning-rgb));
 }
 
+.laboratory-metric-evidence-scene__legend span[data-decision="rolling"]::before {
+  box-sizing: border-box;
+  border: 1px solid rgb(var(--nodedc-accent-rgb));
+  background: transparent;
+}
+
 @media (max-width: 900px) {
   .laboratory-metric-evidence-scene__toolbar > span {
     display: none;