* Auto-attach pasted GitHub PR/issue URLs in the composer
Paste a GitHub PR or issue link into any composer and it shows up
as an attachment pill within a debounce tick when the URL matches
the workspace's remote. On the new-workspace screen, an attached PR
also surfaces an inline "Check out PR #N?" hint next to the picker;
one click promotes it to the checkout target through the same
syncPickerPrAttachment flow the dropdown uses.
Unifies the new-workspace picker and composer attachment picker on
one shared GitHub search hook and cache key, so both consumers (and
the auto-attach lookup) share the React Query cache.
* Fix oxfmt formatting in new-workspace-screen import
Move composer cancel/queue/attachment/dispatch orchestration out of
composer.tsx into a React-free actions module. The module takes its
dependencies (send client, queue writer, stream writer, attachment
persister, image picker) as injected ports, so the new
composer-actions.test.ts can drive every action with inline fakes —
zero vi.mock of internal modules, zero JSDOM, zero React.
The old composer.test.tsx (heavy mocked component test) is removed
and replaced with composer-actions.test.ts (31 unit tests).
Also extract isWorkspaceAttachment / userAttachmentsOnly /
workspaceAttachmentToSubmitAttachment from composer-workspace-attachments.tsx
into a sibling .ts so the actions module (and composer-attachments.ts)
can use them without dragging React/RN/lucide into a pure test graph.
