fix: recover table-cell transform errors

src/components/richEditorTransformErrorRecoveryExtension.test.ts

@@ -139,6 +139,13 @@ describe('installRichEditorTransformErrorRecovery', () => {
     )
   })
 
+  it('repairs invalid table-cell joins while editing table contents', () => {
+    expectDocumentRepairRecovery(
+      transformError('Cannot join tableCell onto blockContainer'),
+      'invalid_block_join',
+    )
+  })
+
   it('recovers invalid block joins thrown during keydown handling before dispatch', () => {
     const { view, keyDownPlugin } = createViewWithSomeProp(() => {
       throw transformError('Cannot join blockGroup onto blockContainer')
@@ -155,6 +162,22 @@ describe('installRichEditorTransformErrorRecovery', () => {
     })
   })
 
+  it('recovers invalid table-cell joins thrown during keydown handling', () => {
+    const { view, keyDownPlugin } = createViewWithSomeProp(() => {
+      throw transformError('Cannot join tableCell onto blockContainer')
+    })
+    const recoverDocument = vi.fn()
+
+    installRichEditorTransformErrorRecovery(view, { recoverDocument })
+
+    expect(view.someProp('handleKeyDown', (handler) => handler())).toBe(true)
+    expect(keyDownPlugin).toHaveBeenCalledTimes(1)
+    expect(recoverDocument).toHaveBeenCalledTimes(1)
+    expect(trackEvent).toHaveBeenCalledWith('rich_editor_transform_error_recovered', {
+      reason: 'invalid_block_join',
+    })
+  })
+
   it('keeps unrelated keydown handler failures visible', () => {
     const { view } = createViewWithSomeProp(() => {
       throw new Error('keyboard plugin failed')

src/components/richEditorTransformErrorRecoveryExtension.ts

@@ -92,7 +92,7 @@ function isTablePositionOutOfRangeError(error: unknown): boolean {
 }
 
 function isInvalidBlockJoinError(error: unknown): boolean {
-  return isTransformError(error) && error.message === 'Cannot join blockGroup onto blockContainer'
+  return isTransformError(error) && /^Cannot join (blockGroup|tableCell) onto blockContainer$/.test(error.message)
 }
 
 export function isStaleBlockReferenceError(error: unknown): boolean {