[prellr]

Summary

Builds Rail-1 of the Drafts "global germination rail": a draft-level, un-anchored conversation surface (chat-style), distinct from the anchored annotation threads. Humans only this slice — author_type/author_user_id are modeled now so Rail-2 (Aye via multica draft say) is a drop-in with no migration.

Approach: a near-mechanical clone of the shipped draft_annotation_message stack, minus the anchor — a flat per-draft message log. Each layer mirrors the annotation surface 1:1.

What's in it

Backend (migration 126)

• draft_message table: id, draft_id (FK→draft CASCADE), workspace_id (denormalized FK→workspace), open-enum author_type (no CHECK), nullable author_user_id (FK→user SET NULL), body, created_at; (draft_id, created_at) index.
• Queries ListDraftMessages / CreateDraftMessage (sqlc, no drift).
• Handler draft_message.go: list + create, resolving the parent draft via loadDraftForUser then using draft.ID (UUID convention); empty body → 400; publishes draft_message:created with the resolveActor actor.
• Extracted resolveDraftAnnotationAuthor → shared resolveDraftAuthor (it was annotation-agnostic) — reused by both surfaces.
• Routes GET/POST under /api/drafts/{id}/messages (inherits the workspace-member middleware).
• WS event EventDraftMessageCreated.

Core TS — DraftMessage types + index export; DraftMessageSchema/ListDraftMessagesResponseSchema (.loose(), parseWithFallback, EMPTY fallbacks) + a malformed-response drift test; listDraftMessages/addDraftMessage client methods; draftMessageKeys (keyed [wsId, draftId]) + list options; useAddDraftMessage (optimistic append + temp→real swap); onDraftMessageCreated WS updater (de-dupe + temp-match); wired draft_message:created into use-realtime-sync + WSEventType.

Frontend (packages/views/drafts/)

• Extracted shared row: the annotation thread's inline ThreadMessage → common/message-row.tsx (avatar + sender + timestamp + Markdown). Both message shapes satisfy its props; the annotation panel imports it (No-Duplication Rule).
• conversation/conversation-rail.tsx: scrollable list (shared row) over a persistent bottom composer (Cmd/Ctrl+Enter to send), empty state.
• conversation/draft-side-panel.tsx: two-tab wrapper — Conversation (default) | Annotations (+ open-count badge). Local useState for the active tab. Owns the w-96 rail chrome; each tab renders embedded.
• Swapped AnnotationThreadPanel → DraftSidePanel in the editor (annotation props threaded to the Annotations tab + wsId/draftId to the rail; w-96 footprint + drag regions unchanged).
• i18n drafts.conversation.* (en + zh-Hans).

Annotation panel — unchanged behaviorally

AnnotationThreadPanel gained an opt-in embedded prop (drops the standalone width/border/title header when inside the tab wrapper). The default — and everything its own tests render — is identical to before. Its 11 tests pass unchanged after the MessageRow extraction.

Verification

• make sqlc clean (no drift); go build ./... + go vet ./... clean; full go test ./internal/handler/ green (DraftMessage create+list / empty-body 400 / bad-UUID guard / cross-owner denial, plus all existing Draft + annotation tests after the resolveDraftAuthor rename). Migrations 123–126 applied locally.
• pnpm typecheck (all 6 tasks incl. web + desktop), pnpm test (all packages, 866 views + 389 core), pnpm lint (0 errors), i18n parity test — all green.

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