Replaces the PR4 stub at /documents/[id] with the full Phase A detail
view: gradient header strip, status-aware action bar (Cancel /
Download / Email signatories), per-signer remind + copy-link, watcher
list with remove, and activity timeline. Adds the supporting endpoints
(cancel, compose-completion-email, watchers GET/POST/DELETE) and
listDocumentWatchers / addDocumentWatcher / removeDocumentWatcher
service helpers. The document GET now serves the aggregator shape
when ?detail=true.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
aa15807063