diff --git a/apps/desktop/src/components/ui/CustomContextMenu.vue b/apps/desktop/src/components/ui/CustomContextMenu.vue
index c770563d0b..5ac83cceec 100644
--- a/apps/desktop/src/components/ui/CustomContextMenu.vue
+++ b/apps/desktop/src/components/ui/CustomContextMenu.vue
@@ -1,7 +1,8 @@
 <script setup lang="ts">
-import { ref, watch, onBeforeUnmount, nextTick, type Component } from "vue";
+import { ref, watch, onBeforeUnmount, onMounted, nextTick, type Component } from "vue";
 import { ChevronRight } from "@lucide/vue";
 import { shortcutDisplayKeys } from "@/lib/editor/shortcutDisplay";
+import { registerGlobalContextMenu, type ContextMenuRegistration } from "@/components/ui/customContextMenuRegistry";
 
 export interface ContextMenuItem {
   label: string;
@@ -31,24 +32,6 @@ defineSlots<{
   default(props: { onContextMenu: (event: MouseEvent) => void }): any;
 }>();
 
-// ---- module-level singleton state ----
-const openMenus = new Set<() => void>();
-let globalSetup = false;
-
-function ensureGlobalListeners() {
-  if (globalSetup) return;
-  globalSetup = true;
-  const closeAll = () => {
-    for (const c of openMenus) c();
-    openMenus.clear();
-  };
-  document.addEventListener("contextmenu", closeAll, true);
-  document.addEventListener("scroll", closeAll, true);
-  window.addEventListener("resize", closeAll);
-}
-ensureGlobalListeners();
-// -------------------------------------
-
 const show = ref(false);
 const x = ref(0);
 const y = ref(0);
@@ -62,6 +45,7 @@ const subX = ref(0);
 const subY = ref(0);
 let subCloseTimer: ReturnType<typeof setTimeout> | null = null;
 let subAnchorRect: { left: number; right: number; top: number; bottom: number } | null = null;
+let contextMenuRegistration: ContextMenuRegistration | null = null;
 
 function close() {
   activeSubIndex.value = null;
@@ -99,14 +83,13 @@ function onResize() {
 }
 
 watch(show, (val) => {
+  contextMenuRegistration?.setOpen(val);
   if (val) {
-    openMenus.add(close);
     document.addEventListener("pointerdown", onPointerDownOutside, true);
     document.addEventListener("keydown", onKeydown);
     document.addEventListener("scroll", onScroll, true);
     window.addEventListener("resize", onResize);
   } else {
-    openMenus.delete(close);
     document.removeEventListener("pointerdown", onPointerDownOutside, true);
     document.removeEventListener("keydown", onKeydown);
     document.removeEventListener("scroll", onScroll, true);
@@ -114,6 +97,10 @@ watch(show, (val) => {
   }
 });
 
+onMounted(() => {
+  contextMenuRegistration = registerGlobalContextMenu(close);
+});
+
 function handleItemClick(item: ContextMenuItem) {
   if (item.disabled) return;
   if (item.children?.length) return; // submenu trigger — do nothing on click
@@ -258,7 +245,8 @@ function shortcutKeys(shortcut?: string): string[] {
 }
 
 onBeforeUnmount(() => {
-  openMenus.delete(close);
+  contextMenuRegistration?.dispose();
+  contextMenuRegistration = null;
   document.removeEventListener("pointerdown", onPointerDownOutside, true);
   document.removeEventListener("keydown", onKeydown);
   document.removeEventListener("scroll", onScroll, true);
diff --git a/apps/desktop/src/components/ui/__tests__/CustomContextMenu.spec.ts b/apps/desktop/src/components/ui/__tests__/CustomContextMenu.spec.ts
new file mode 100644
index 0000000000..76fe994462
--- /dev/null
+++ b/apps/desktop/src/components/ui/__tests__/CustomContextMenu.spec.ts
@@ -0,0 +1,99 @@
+// @vitest-environment happy-dom
+
+import { createApp, defineComponent, h, nextTick } from "vue";
+import { afterEach, describe, expect, it, vi } from "vitest";
+import CustomContextMenu from "@/components/ui/CustomContextMenu.vue";
+
+function callsFor(spy: ReturnType<typeof vi.spyOn>, eventName: string) {
+  return spy.mock.calls.filter(([name]) => name === eventName);
+}
+
+function removalsForListener(spy: ReturnType<typeof vi.spyOn>, eventName: string, listener: unknown) {
+  return spy.mock.calls.filter(([name, candidate]) => name === eventName && candidate === listener);
+}
+
+const mountedContainers: HTMLElement[] = [];
+
+afterEach(() => {
+  for (const container of mountedContainers.splice(0)) container.remove();
+  vi.restoreAllMocks();
+});
+
+describe("CustomContextMenu lifecycle", () => {
+  it("uses one shared listener set across repeated bulk mount cycles", async () => {
+    const documentAdd = vi.spyOn(document, "addEventListener");
+    const documentRemove = vi.spyOn(document, "removeEventListener");
+    const windowAdd = vi.spyOn(window, "addEventListener");
+    const windowRemove = vi.spyOn(window, "removeEventListener");
+
+    for (let cycle = 1; cycle <= 3; cycle += 1) {
+      const root = defineComponent({
+        setup() {
+          return () =>
+            Array.from({ length: 200 }, (_, index) =>
+              h(
+                CustomContextMenu,
+                { items: [{ label: `Action ${index}` }] },
+                {
+                  default: ({ onContextMenu }: { onContextMenu: (event: MouseEvent) => void }) => h("div", { onContextmenu: onContextMenu }, `Target ${index}`),
+                },
+              ),
+            );
+        },
+      });
+      const container = document.createElement("div");
+      mountedContainers.push(container);
+      document.body.append(container);
+      const app = createApp(root);
+
+      app.mount(container);
+      await nextTick();
+      expect(callsFor(documentAdd, "contextmenu")).toHaveLength(cycle);
+      expect(callsFor(documentAdd, "scroll")).toHaveLength(cycle);
+      expect(callsFor(windowAdd, "resize")).toHaveLength(cycle);
+      const contextMenuListener = callsFor(documentAdd, "contextmenu")[cycle - 1][1];
+      const scrollListener = callsFor(documentAdd, "scroll")[cycle - 1][1];
+      const resizeListener = callsFor(windowAdd, "resize")[cycle - 1][1];
+      const contextMenuRemovals = removalsForListener(documentRemove, "contextmenu", contextMenuListener).length;
+      const scrollRemovals = removalsForListener(documentRemove, "scroll", scrollListener).length;
+      const resizeRemovals = removalsForListener(windowRemove, "resize", resizeListener).length;
+
+      app.unmount();
+      await nextTick();
+      expect(removalsForListener(documentRemove, "contextmenu", contextMenuListener)).toHaveLength(contextMenuRemovals + 1);
+      expect(removalsForListener(documentRemove, "scroll", scrollListener)).toHaveLength(scrollRemovals + 1);
+      expect(removalsForListener(windowRemove, "resize", resizeListener)).toHaveLength(resizeRemovals + 1);
+    }
+  });
+
+  it("preserves open and global close behavior", async () => {
+    const root = defineComponent({
+      setup() {
+        return () =>
+          h(
+            CustomContextMenu,
+            { items: [{ label: "Inspect" }] },
+            {
+              default: ({ onContextMenu }: { onContextMenu: (event: MouseEvent) => void }) => h("div", { id: "context-target", onContextmenu: onContextMenu }, "Target"),
+            },
+          );
+      },
+    });
+    const container = document.createElement("div");
+    mountedContainers.push(container);
+    document.body.append(container);
+    const app = createApp(root);
+    app.mount(container);
+
+    const target = container.querySelector("#context-target");
+    target?.dispatchEvent(new MouseEvent("contextmenu", { bubbles: true, clientX: 10, clientY: 20 }));
+    await nextTick();
+    expect(document.body.textContent).toContain("Inspect");
+
+    window.dispatchEvent(new Event("resize"));
+    await nextTick();
+    expect(document.body.textContent).not.toContain("Inspect");
+
+    app.unmount();
+  });
+});
diff --git a/apps/desktop/src/components/ui/__tests__/customContextMenuRegistry.spec.ts b/apps/desktop/src/components/ui/__tests__/customContextMenuRegistry.spec.ts
new file mode 100644
index 0000000000..613b65001a
--- /dev/null
+++ b/apps/desktop/src/components/ui/__tests__/customContextMenuRegistry.spec.ts
@@ -0,0 +1,89 @@
+import { describe, expect, it, vi } from "vitest";
+import { createContextMenuRegistry } from "@/components/ui/customContextMenuRegistry";
+
+function callsFor(spy: ReturnType<typeof vi.spyOn>, eventName: string) {
+  return spy.mock.calls.filter(([name]) => name === eventName);
+}
+
+describe("customContextMenuRegistry", () => {
+  it("shares one global listener set across all registered hosts", () => {
+    const documentTarget = new EventTarget();
+    const windowTarget = new EventTarget();
+    const documentAdd = vi.spyOn(documentTarget, "addEventListener");
+    const windowAdd = vi.spyOn(windowTarget, "addEventListener");
+    const registry = createContextMenuRegistry(documentTarget, windowTarget);
+    const closeFirst = vi.fn();
+    const closeSecond = vi.fn();
+    const registrations = Array.from({ length: 200 }, (_, index) => registry.register(index === 0 ? closeFirst : index === 1 ? closeSecond : vi.fn()));
+
+    expect(callsFor(documentAdd, "contextmenu")).toHaveLength(1);
+    expect(callsFor(documentAdd, "scroll")).toHaveLength(1);
+    expect(callsFor(windowAdd, "resize")).toHaveLength(1);
+
+    registrations[0].setOpen(true);
+    registrations[1].setOpen(true);
+    documentTarget.dispatchEvent(new Event("contextmenu"));
+    expect(closeFirst).toHaveBeenCalledOnce();
+    expect(closeSecond).toHaveBeenCalledOnce();
+
+    documentTarget.dispatchEvent(new Event("scroll"));
+    windowTarget.dispatchEvent(new Event("resize"));
+    expect(closeFirst).toHaveBeenCalledOnce();
+    expect(closeSecond).toHaveBeenCalledOnce();
+
+    registrations.forEach((registration) => registration.dispose());
+  });
+
+  it("removes disposed callbacks and detaches listeners after the final host", () => {
+    const documentTarget = new EventTarget();
+    const windowTarget = new EventTarget();
+    const documentRemove = vi.spyOn(documentTarget, "removeEventListener");
+    const windowRemove = vi.spyOn(windowTarget, "removeEventListener");
+    const registry = createContextMenuRegistry(documentTarget, windowTarget);
+    const closeDisposed = vi.fn();
+    const closeRemaining = vi.fn();
+    const disposed = registry.register(closeDisposed);
+    const remaining = registry.register(closeRemaining);
+
+    disposed.setOpen(true);
+    remaining.setOpen(true);
+    disposed.dispose();
+    disposed.dispose();
+    documentTarget.dispatchEvent(new Event("scroll"));
+
+    expect(closeDisposed).not.toHaveBeenCalled();
+    expect(closeRemaining).toHaveBeenCalledOnce();
+    expect(callsFor(documentRemove, "contextmenu")).toHaveLength(0);
+
+    remaining.dispose();
+    expect(callsFor(documentRemove, "contextmenu")).toHaveLength(1);
+    expect(callsFor(documentRemove, "scroll")).toHaveLength(1);
+    expect(callsFor(windowRemove, "resize")).toHaveLength(1);
+  });
+
+  it("reattaches a clean listener set after complete teardown", () => {
+    const documentTarget = new EventTarget();
+    const windowTarget = new EventTarget();
+    const documentAdd = vi.spyOn(documentTarget, "addEventListener");
+    const windowAdd = vi.spyOn(windowTarget, "addEventListener");
+    const registry = createContextMenuRegistry(documentTarget, windowTarget);
+    const staleClose = vi.fn();
+    const first = registry.register(staleClose);
+
+    first.setOpen(true);
+    first.dispose();
+
+    const activeClose = vi.fn();
+    const second = registry.register(activeClose);
+    second.setOpen(true);
+    windowTarget.dispatchEvent(new Event("resize"));
+
+    expect(staleClose).not.toHaveBeenCalled();
+    expect(activeClose).toHaveBeenCalledOnce();
+    expect(callsFor(documentAdd, "contextmenu")).toHaveLength(2);
+    expect(callsFor(documentAdd, "scroll")).toHaveLength(2);
+    expect(callsFor(windowAdd, "resize")).toHaveLength(2);
+
+    second.dispose();
+  });
+});
diff --git a/apps/desktop/src/components/ui/customContextMenuRegistry.ts b/apps/desktop/src/components/ui/customContextMenuRegistry.ts
new file mode 100644
index 0000000000..aa2cdab742
--- /dev/null
+++ b/apps/desktop/src/components/ui/customContextMenuRegistry.ts
@@ -0,0 +1,69 @@
+export type ContextMenuClose = () => void;
+
+export interface ContextMenuRegistration {
+  setOpen(open: boolean): void;
+  dispose(): void;
+}
+
+export interface ContextMenuRegistry {
+  register(close: ContextMenuClose): ContextMenuRegistration;
+}
+
+export function createContextMenuRegistry(documentTarget: EventTarget, windowTarget: EventTarget): ContextMenuRegistry {
+  const openMenus = new Set<ContextMenuClose>();
+  let hostCount = 0;
+  let listenersAttached = false;
+
+  function closeAll() {
+    const closers = [...openMenus];
+    openMenus.clear();
+    for (const close of closers) close();
+  }
+
+  function attachListeners() {
+    if (listenersAttached) return;
+    documentTarget.addEventListener("contextmenu", closeAll, true);
+    documentTarget.addEventListener("scroll", closeAll, true);
+    windowTarget.addEventListener("resize", closeAll);
+    listenersAttached = true;
+  }
+
+  function detachListeners() {
+    if (!listenersAttached) return;
+    documentTarget.removeEventListener("contextmenu", closeAll, true);
+    documentTarget.removeEventListener("scroll", closeAll, true);
+    windowTarget.removeEventListener("resize", closeAll);
+    listenersAttached = false;
+    openMenus.clear();
+  }
+
+  return {
+    register(close) {
+      hostCount += 1;
+      attachListeners();
+      let disposed = false;
+
+      return {
+        setOpen(open) {
+          if (disposed) return;
+          if (open) openMenus.add(close);
+          else openMenus.delete(close);
+        },
+        dispose() {
+          if (disposed) return;
+          disposed = true;
+          openMenus.delete(close);
+          hostCount -= 1;
+          if (hostCount === 0) detachListeners();
+        },
+      };
+    },
+  };
+}
+
+let globalContextMenuRegistry: ContextMenuRegistry | undefined;
+
+export function registerGlobalContextMenu(close: ContextMenuClose): ContextMenuRegistration {
+  globalContextMenuRegistry ??= createContextMenuRegistry(document, window);
+  return globalContextMenuRegistry.register(close);
+}