diff --git a/src/renderer/src/components/editor/setup-contextual-copy.test.ts b/src/renderer/src/components/editor/setup-contextual-copy.test.ts
new file mode 100644
index 00000000000..ce3da798b73
--- /dev/null
+++ b/src/renderer/src/components/editor/setup-contextual-copy.test.ts
@@ -0,0 +1,108 @@
+import type { editor } from 'monaco-editor'
+import { afterEach, describe, expect, it, vi } from 'vitest'
+import { setupContextualCopy } from './setup-contextual-copy'
+
+vi.mock('@/hooks/useShortcutLabel', () => ({
+  formatShortcutLabel: () => 'Copy Context'
+}))
+
+vi.mock('@/lib/monaco-setup', () => ({
+  monaco: {
+    editor: {
+      ContentWidgetPositionPreference: {
+        ABOVE: 1,
+        BELOW: 2
+      }
+    }
+  }
+}))
+
+vi.mock('@/store', () => ({
+  useAppStore: {
+    getState: () => ({ keybindings: {} })
+  }
+}))
+
+vi.mock('@/lib/primary-selection', () => ({
+  PRIMARY_SELECTION_MAX_LENGTH: 10_000,
+  isPrimarySelectionEnabled: () => false,
+  setPrimarySelectionText: () => {}
+}))
+
+describe('setupContextualCopy', () => {
+  afterEach(() => {
+    vi.unstubAllGlobals()
+  })
+
+  it('clears editor-scoped contextual copy cleanup on dispose', () => {
+    const clearTimeout = vi.fn()
+    const clearInterval = vi.fn()
+    vi.stubGlobal('window', {
+      clearInterval,
+      clearTimeout,
+      setInterval: vi.fn(() => 1),
+      setTimeout: vi.fn(() => 2)
+    })
+    vi.stubGlobal('document', {
+      createElement: () => ({
+        className: '',
+        offsetHeight: 28,
+        style: { display: '' },
+        textContent: ''
+      })
+    })
+
+    const editorDomNode = {
+      addEventListener: vi.fn(),
+      removeEventListener: vi.fn()
+    }
+    const selectionDispose = vi.fn()
+    const scrollDispose = vi.fn()
+    const focusDispose = vi.fn()
+    const blurDispose = vi.fn()
+    let disposeEditor = (): void => {}
+    const editorInstance = {
+      addContentWidget: vi.fn(),
+      getContainerDomNode: () => editorDomNode,
+      getModel: () => null,
+      getSelection: () => null,
+      hasTextFocus: () => false,
+      layoutContentWidget: vi.fn(),
+      onDidBlurEditorText: () => ({ dispose: blurDispose }),
+      onDidChangeCursorSelection: () => ({ dispose: selectionDispose }),
+      onDidDispose: (listener: () => void) => {
+        disposeEditor = listener
+        return { dispose: vi.fn() }
+      },
+      onDidFocusEditorText: () => ({ dispose: focusDispose }),
+      onDidScrollChange: () => ({ dispose: scrollDispose }),
+      removeContentWidget: vi.fn()
+    } as unknown as editor.IStandaloneCodeEditor
+    const copyToastTimeoutRef = { current: 42 }
+    const setCopyToast = vi.fn()
+
+    setupContextualCopy({
+      editorInstance,
+      filePath: 'src/example.ts',
+      setCopyToast,
+      propsRef: {
+        current: {
+          language: 'typescript',
+          relativePath: 'src/example.ts'
+        }
+      },
+      copyToastTimeoutRef
+    })
+
+    disposeEditor()
+
+    expect(selectionDispose).toHaveBeenCalledTimes(1)
+    expect(scrollDispose).toHaveBeenCalledTimes(1)
+    expect(focusDispose).toHaveBeenCalledTimes(1)
+    expect(blurDispose).toHaveBeenCalledTimes(1)
+    expect(clearTimeout).toHaveBeenCalledWith(42)
+    expect(copyToastTimeoutRef.current).toBeNull()
+    expect(setCopyToast).toHaveBeenCalledWith(null)
+    expect(editorDomNode.removeEventListener).toHaveBeenCalledTimes(3)
+  })
+})
diff --git a/src/renderer/src/components/editor/setup-contextual-copy.ts b/src/renderer/src/components/editor/setup-contextual-copy.ts
index 71eadd719ca..6f94b7a5e88 100644
--- a/src/renderer/src/components/editor/setup-contextual-copy.ts
+++ b/src/renderer/src/components/editor/setup-contextual-copy.ts
@@ -300,6 +300,13 @@ export function setupContextualCopy({
     scrollListener.dispose()
     focusListener.dispose()
     blurListener.dispose()
+    // Why: the confirmation toast timeout belongs to the Monaco editor that
+    // scheduled it, so editor disposal is the earliest reliable cleanup point.
+    if (copyToastTimeoutRef.current !== null) {
+      window.clearTimeout(copyToastTimeoutRef.current)
+      copyToastTimeoutRef.current = null
+      setCopyToast(null)
+    }
     if (primarySelectionTimer !== null) {
       window.clearTimeout(primarySelectionTimer)
       primarySelectionTimer = null
diff --git a/src/renderer/src/components/editor/useContextualCopySetup.tsx b/src/renderer/src/components/editor/useContextualCopySetup.tsx
index c65e0783f3c..5c3f31dbbfc 100644
--- a/src/renderer/src/components/editor/useContextualCopySetup.tsx
+++ b/src/renderer/src/components/editor/useContextualCopySetup.tsx
@@ -1,4 +1,4 @@
-import React, { useRef, useState, useEffect, useCallback } from 'react'
+import React, { useRef, useState, useCallback } from 'react'
 import type { editor } from 'monaco-editor'
 import { setupContextualCopy } from './setup-contextual-copy'
 
@@ -6,15 +6,6 @@ export function useContextualCopySetup() {
   const [copyToast, setCopyToast] = useState<{ left: number; top: number } | null>(null)
   const copyToastTimeoutRef = useRef<number | null>(null)
 
-  useEffect(() => {
-    const toastRef = copyToastTimeoutRef
-    return () => {
-      if (toastRef.current !== null) {
-        window.clearTimeout(toastRef.current)
-      }
-    }
-  }, [])
-
   const setupCopy = useCallback(
     (
       editorInstance: editor.IStandaloneCodeEditor,