fix: stabilize release CI regression tests

Address Desktop CI 35849362694 failures with isolated OpenCode config dependencies, cleared IPC lookup counts, Supervisor default-off expectations, and polling-safe UI fixtures and timeouts.

Record the failed candidate CI and follow-up validation: 14 focused tests, typecheck, and lint passed. Product code, versions, and bilingual release notes are unchanged. The revised candidate requires approval and successful main-branch CI before tagging.

src/main/ipc.test.ts

@@ -9649,6 +9649,7 @@ describe('registerIpcHandlers agent terminal state', () => {
       }
     )
     const event = trustedEvent(harness.webContents)
+    harness.getApplicationSettings.mockClear()
     const request = {
       requestId: '00000000-0000-4000-8000-000000000013',
       conversationId: 'duplicate-request',
@@ -9737,6 +9738,7 @@ describe('registerIpcHandlers agent terminal state', () => {
         getEnabledBuiltinMcpServerIds
       }
     )
+    harness.getApplicationSettings.mockClear()
     harness.getApplicationSettings.mockReturnValueOnce(
       applicationSettings
     )