Q88: a sign-in is saved only if a run can use and renew it

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/preload/index.ts

@@ -55,7 +55,6 @@ const api: DesktopApi = {
   markChatSpaceRead: (input) => invoke(IPC_CHANNELS.markChatSpaceRead, input),
   saveProviderCredential: (input) => invoke(IPC_CHANNELS.saveProviderCredential, input),
   revokeProviderCredential: (input) => invoke(IPC_CHANNELS.revokeProviderCredential, input),
-  launchProviderSignIn: (input) => invoke(IPC_CHANNELS.launchProviderSignIn, input),
   startProviderOAuth: (input) => invoke(IPC_CHANNELS.startProviderOAuth, input),
   cancelProviderOAuth: (input) => invoke(IPC_CHANNELS.cancelProviderOAuth, input),
   checkProviderHealth: (input) => invoke(IPC_CHANNELS.checkProviderHealth, input),