fix(desktop): leave a stopped native file tool's outcome to Stop (#8732)

A local read or import cancelled by the user's Stop (or by signing out) reported its own
failure, which raced Stop's settlement: whichever committed first decided whether the call
ended failed or cancelled. Native file tools now report nothing once cancelled, like browser
actions and granted-folder reads, so Stop's record stands.

Author: waleedlatif1

apps/sim/lib/mothership/tools/client/native-files.test.ts

@@ -125,3 +125,28 @@ it('returns local visual observations through the existing completion path', asy
   expect(mocks.complete).toHaveBeenCalledWith('tool', 'success', expect.any(String), data)
   expect(mocks.upload).not.toHaveBeenCalled()
 })
+
+it('an import the user stopped leaves its outcome to Stop instead of reporting a failure', async () => {
+  const stop = new AbortController()
+  mocks.invoke.mockResolvedValueOnce({ ok: true, data: manifest })
+  mocks.upload.mockImplementationOnce(async () => {
+    stop.abort('user_stop:client_stopGeneration')
+    throw new DOMException('The operation was aborted.', 'AbortError')
+  })
+  await executeNativeFileTool('tool', 'import_local_files', stop.signal)
+  expect(mocks.complete).not.toHaveBeenCalled()
+  expect(mocks.exit).not.toHaveBeenCalled()
+})
+
+it('a read the user stopped while the desktop was reading reports nothing', async () => {
+  const stop = new AbortController()
+  mocks.invoke.mockImplementationOnce(async () => {
+    stop.abort('user_stop:client_stopGeneration')
+    return {
+      ok: true,
+      data: { kind: 'read', path: '/notes.txt', representation: 'text', text: 'notes' },
+    }
+  })
+  await executeNativeFileTool('tool', 'read_local_file', stop.signal)
+  expect(mocks.complete).not.toHaveBeenCalled()
+})

apps/sim/lib/mothership/tools/client/native-files.ts

@@ -145,6 +145,9 @@ export async function executeNativeFileTool(
       response.data.kind === 'manifest'
         ? localFileImportCompletion(await importNativeFiles(toolCallId, response.data, signal))
         : localFileReadCompletion(response)
+    // Cancelled by the user's Stop or by signing out: whoever cancelled it settles the call, as for
+    // browser actions and granted-folder reads. A failure reported here would race Stop's record.
+    if (signal?.aborted) return
     await reportClientToolCompletion(
       toolCallId,
       completion.status,
@@ -153,6 +156,7 @@ export async function executeNativeFileTool(
     )
     settled = true
   } catch (error) {
+    if (signal?.aborted) return
     await reportClientToolCompletion(
       toolCallId,
       ASYNC_TOOL_CONFIRMATION_STATUS.error,