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coder/site
Michael Suchacz 8d08885792 fix(site): archive chats when workspace is already deleted (#23994)
When a user tries to archive-and-delete a chat from /agents but the
workspace is already gone, the UI showed a "Failed to look up workspace
for deletion" toast and blocked the archive. This change detects the
workspace-gone response and archives the chat without attempting
deletion.

## Changes

The backend returns 410 Gone for soft-deleted workspaces and 404 for
workspaces that do not exist or the user cannot access.
`isWorkspaceNotFound()` detects both status codes.

`resolveArchiveAndDeleteAction()` now returns `"archive"` when the
workspace preflight fetch gets a 404 or 410, and the page branches on
that action to call the existing archive mutation directly. The
`archiveAndDeleteMutation` also tolerates these status codes from
`deleteWorkspace()` to handle the race where the workspace disappears
between the preflight lookup and the actual delete call.

The mutation body was extracted into a testable
`archiveAndDeleteWorkspace()` utility so the tolerance logic has direct
test coverage. A `navigateAfterArchive()` helper consolidates the
post-archive redirect logic that was previously duplicated across the
proceed, confirm, and archive paths.

## Pre-existing patterns preserved

- The `"proceed"` and `"confirm"` archive-and-delete paths use
`onSettled` for navigation, matching the existing behavior before this
change. Only the new `"archive"` path uses `onSuccess` since it has no
workspace deletion step that should still navigate on partial failure.
- `isWorkspaceNotFound()` uses the same `isAxiosError(error) &&
error.response?.status` pattern already used in several places in
`site/src/api/api.ts`. The backend 404 ambiguity (deleted vs
unauthorized) is documented in the JSDoc.
- The pre-existing double-submit race during the async preflight window
is unchanged.
2026-04-02 21:33:10 +02:00
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