fix: unblock hung Log Out and Mingo archive TypeError

[posthog]

Problem

• Two confirmation modals never settle — a user who confirms Log Out stays signed in behind a spinner that never stops, and a user who archives a Mingo chat gets a raw TypeError banner instead of the archive.
• Log Out (P1, session hygiene). An explicit sign-out silently leaves the session live, which matters on a shared machine in a tool that grants remote device control. Reproduced in a real session recording: confirm → ~3 minutes of nothing → back on /dashboard, still authenticated.
• Mingo archive. The broken helper backs all four dialog operations: archive, unarchive, rename, and the archived-list fetch — so every GraphQL-level failure surfaces as Cannot read properties of null (reading 'archiveDialog') instead of the server's reason.

Root cause

Defect	Mechanism
Hung logout	logoutAsync fired fetch with no timeout and no AbortController; performLogout awaited it before clearing local state or redirecting. A hung request never rejects, so the catch never runs and isPending stays true forever.
Mingo TypeError	runDialogMutation and the archived-list fetch read response.data.data[key] without checking the GraphQL errors array or a null data. A failed mutation returns HTTP 200 with data: null, so the code dereferences null.

Changes

• Bound the logout call. An AbortController aborts the fetch after 5 s. On timeout the fetch rejects, logoutAsync returns false, and performLogout runs its existing teardown and redirect regardless of the server result.
• Guard the GraphQL response. Both Mingo helpers now check response.data.errors first and surface the server's message, then guard data before indexing it — matching the existing pattern in tickets/utils/graphql.ts and mingo/context/rest-items.tsx.

Verification

• npm run type-check and npm run lint:biome pass on both changed files.
• The logout symptom is a hang, not a visual glitch: the fix is a timeout on the awaited call, so the modal's existing teardown path always runs.

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Created with PostHog Desktop from this inbox report.