feat(overlay): run session help commands with Enter or double-click (#275)

src/renderer/style.css

@@ -4125,6 +4125,21 @@ body.subtitle-sidebar-embedded-open #subtitleSidebarContent {
   line-height: 1.35;
 }
 
+/* Runnable rows reveal their hint only on the row Enter would run. */
+.session-help-run-hint {
+  flex: 0 0 auto;
+  font-size: 11px;
+  font-weight: 600;
+  color: var(--ctp-blue);
+  white-space: nowrap;
+  opacity: 0;
+  transition: opacity 120ms ease;
+}
+
+.session-help-item-runnable.active .session-help-run-hint {
+  opacity: 1;
+}
+
 .session-help-color-dot {
   width: 10px;
   height: 10px;