fix(editor): record mirrored-close intent synchronously to close the ghost-tab window

Co-authored-by: Orca <help@stably.ai>

src/renderer/src/runtime/close-mirrored-editor-tab.test.ts

@@ -16,6 +16,11 @@ import {
   notifyHostOfMirroredEditorClose,
   type MirroredEditorCloseState
 } from './close-mirrored-editor-tab'
+import {
+  isWebSessionCloseIntentPending,
+  resetWebSessionCloseIntentForTests
+} from './web-session-close-intent'
+import { toHostSessionTabId } from '../../../shared/terminal-surface-id'
 
 function buildState(overrides: Partial<MirroredEditorCloseState> = {}): MirroredEditorCloseState {
   return {
@@ -32,6 +37,16 @@ describe('notifyHostOfMirroredEditorClose', () => {
     closeWebRuntimeSessionTabMock.mockReset()
     getRuntimeEnvironmentIdForWorktreeMock.mockReset()
     getRuntimeEnvironmentIdForWorktreeMock.mockReturnValue('env-1')
+    resetWebSessionCloseIntentForTests()
+  })
+
+  it('records the host close intent SYNCHRONOUSLY (before the async close resolves)', () => {
+    const now = Date.now()
+    // No await: the intent must be pending the instant the call returns, so a
+    // host snapshot in the dynamic-import gap can't flash the old-path tab back.
+    notifyHostOfMirroredEditorClose(buildState(), 'wt-1', 'file-1')
+
+    expect(isWebSessionCloseIntentPending('wt-1', toHostSessionTabId('host-tab-1'), now)).toBe(true)
   })
 
   it('closes the mirrored editor tab on the host using the host tab id', async () => {

src/renderer/src/runtime/close-mirrored-editor-tab.ts

@@ -2,6 +2,8 @@ import {
   getRuntimeEnvironmentIdForWorktree,
   type WorktreeRuntimeOwnerState
 } from '@/lib/worktree-runtime-owner'
+import { recordWebSessionCloseIntent } from './web-session-close-intent'
+import { toHostSessionTabId } from '../../../shared/terminal-surface-id'
 import type { OpenFile } from '@/store/slices/editor'
 import type { Tab } from '../../../shared/types'
 
@@ -40,6 +42,10 @@ export function notifyHostOfMirroredEditorClose(
   if (!unifiedTab) {
     return false
   }
+  // Record the close intent SYNCHRONOUSLY (leaf modules, no cycle) so a host
+  // snapshot landing before the dynamic import below resolves can't flash the
+  // old-path tab back. closeWebRuntimeSessionTab re-records it idempotently.
+  recordWebSessionCloseIntent(worktreeId, toHostSessionTabId(unifiedTab.id), Date.now())
   // Why: this helper is imported by the editor slice during store creation.
   // Importing web-runtime-session eagerly would import the store back and can
   // trip cyclic initialization in full-suite test/import order.