Michael Suchacz 610f321d52 fix(site/src): disable archive actions for active chats (#28264)
Closes
[CODAGT-632](https://linear.app/codercom/issue/CODAGT-632/gray-out-the-archive-chat-button-when-chat-is-running).

The chatd state machine only permits archiving a chat family from idle
execution states (`waiting`/`error`); archiving an active chat fails
with HTTP 409. The agents UI still offered "Archive agent" and "Archive
& delete workspace" for active chats, and `AgentsPageLayout` showed a
confirm dialog claiming "Archiving it will interrupt the current run",
which is no longer true: confirming just surfaced the 409 error toast.

## Changes

- `ChatActionsMenuItems` gains a `chatFamilyAllowsArchive` helper
mirroring the backend rule: archive is allowed only when the root chat
and every embedded child are `waiting`/`error` (archive cascades
atomically over the family, so an active child also rejects it). Unknown
status stays fail-open with the server 409 as backstop. A new
`isArchiveBlocked` prop disables both archive items; unarchive, pin, and
rename are unaffected.
- While blocked, the menu shows a visible hint ("Interrupt or wait for
the agent to finish first.") and both disabled items reference it via
`aria-describedby`.
- Sidebar rows (`ChatTreeNode`, covering the dropdown and the
right-click context menu) gate on the chat list record, which watch
events already keep fresh. The chat top bar gates on the live stream
status (`liveChatStatus`) plus the same list record's children, passed
through the layout outlet context, so all three menus read one live
source and re-evaluate without a reload.
- Removed the stale "Archive agent?" interrupt-confirm dialog and its
pending-state plumbing from `AgentsPageLayout`; archive now mutates
directly.
- "Archive & delete workspace" is now archive-first: the archive call is
the atomic server-side eligibility check and completes before the
destructive delete, so a chat that becomes active mid-flow can never
lose its workspace. On delete failure the chat deliberately stays
archived, with no compensating unarchive: the delete outcome can be
ambiguous client-side (a late 5xx can arrive after the delete build
committed), so restoring the chat could resurrect it while its workspace
is being deleted. Instead the mutation refetches all chat collections on
any failure and the toast directs the user to the archived filter, where
Unarchive is one click. This is a deliberate departure from the
self-restoring retry surface of #26900. The workspace-deletion confirm
dialog is unchanged.

## Scope

The client gate is best-effort UX; the server-side 409 is the
correctness backstop. Rare staleness (a chat outside the loaded sidebar
pages, events missed across a socket reconnect) leaves the actions
enabled and the server rejects the request with the existing error
toast. Cache-coherency hardening for those windows was deliberately
removed to keep the change proportionate to the defect.

## Testing

- Storybook play stories: disabled archive items with the accessible
hint for an active chat and for an idle parent with a running child;
enabled items for an idle chat; in the top bar menu and the sidebar
dropdown/context menu (`ChatTopBar.stories.tsx`,
`ChatsSidebar.stories.tsx`).
- Unit tests: archive-first ordering, delete failures keep the chat
archived and rethrow (`agentWorkspaceUtils.test.ts`).
- `pnpm -C site check`, `pnpm -C site lint:types`, whole-file vitest
runs for every touched test/story file.
- Remote dogfood UAT on a deployment built from this branch: archive
items disabled while running and in `requires_action`, re-enabled live
on transition to `waiting`, archive works from `waiting` and `error`
with no confirm dialog, unarchive unaffected.

> Shux acted on Mike's behalf to create this pull request.
2026-08-21 20:35:40 +02:00
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