Add globalToolbarButton slot type and update related documentation

ui/src/components/BreadcrumbBar.tsx

@@ -14,6 +14,7 @@ import {
 } from "@/components/ui/breadcrumb";
 import { Fragment, useMemo } from "react";
 import { PluginSlotOutlet } from "@/plugins/slots";
+import { PluginLauncherOutlet } from "@/plugins/launchers";
 
 export function BreadcrumbBar() {
   const { breadcrumbs } = useBreadcrumbs();
@@ -29,11 +30,18 @@ export function BreadcrumbBar() {
   );
 
   const globalToolbarSlots = (
-    <PluginSlotOutlet
-      slotTypes={["toolbarButton"]}
-      context={globalToolbarSlotContext}
-      className="flex items-center gap-1 ml-auto shrink-0 pl-2"
-    />
+    <div className="flex items-center gap-1 ml-auto shrink-0 pl-2">
+      <PluginSlotOutlet
+        slotTypes={["globalToolbarButton"]}
+        context={globalToolbarSlotContext}
+        className="flex items-center gap-1"
+      />
+      <PluginLauncherOutlet
+        placementZones={["globalToolbarButton"]}
+        context={globalToolbarSlotContext}
+        className="flex items-center gap-1"
+      />
+    </div>
   );
 
   if (breadcrumbs.length === 0) {

ui/src/plugins/launchers.tsx

@@ -110,6 +110,7 @@ const entityScopedZones = new Set<PluginLauncherPlacementZone>([
   "commentAnnotation",
   "commentContextMenuItem",
   "projectSidebarItem",
+  "toolbarButton",
 ]);
 const focusableElementSelector = [
   "button:not([disabled])",

ui/src/plugins/slots.tsx

@@ -102,7 +102,7 @@ function buildRegistryKey(pluginKey: string, exportName: string): string {
 }
 
 function requiresEntityType(slotType: PluginUiSlotType): boolean {
-  return slotType === "detailTab" || slotType === "taskDetailView" || slotType === "contextMenuItem" || slotType === "commentAnnotation" || slotType === "commentContextMenuItem" || slotType === "projectSidebarItem";
+  return slotType === "detailTab" || slotType === "taskDetailView" || slotType === "contextMenuItem" || slotType === "commentAnnotation" || slotType === "commentContextMenuItem" || slotType === "projectSidebarItem" || slotType === "toolbarButton";
 }
 
 function getErrorMessage(error: unknown): string {