The second half of the user feedback that drove send_media: the
linear-list editor reads as a checklist, not a branching flow, which
made conversational structures hard to understand at a glance. This
introduces a canvas view alongside the list — boxes + arrows, drag-
zoom-pan, labeled edges per branch slot. Canvas is the new default;
the list stays as a fallback toggle (per-browser preference,
persisted to localStorage).
PR 1 scope is intentionally read-only: render, don't edit. The
foundation is testable in isolation before adding drag-to-persist,
side-panel editing, and drag-to-connect (PR 2) and polish like
keyboard shortcuts, mobile fallback, and validator integration
(PR 3).
Pieces:
- New @xyflow/react (~30 KB gz) + @dagrejs/dagre (auto-layout for
pre-existing flows whose position_x / position_y are all zero —
flow_nodes already reserved those columns in migration 010
precisely for this).
- Shared module src/components/flows/shared.tsx lifts NodeType,
BuilderNode, NODE_META, summarizeNode, truncate so both views
render nodes identically.
- Pure helpers (no React, fully unit-tested):
src/lib/flows/edges.ts — derive labeled canvas edges per
outgoing slot (button, list row,
condition branch)
src/lib/flows/layout.ts — dagre wrapper + shouldAutoLayout
guard so manually-positioned flows
never get rearranged on open
- FlowCanvas — client component, custom node renderer matching the
list view's collapsed-card styling, MiniMap + Controls, attribution
hidden.
- FlowEditorShell — owns the Canvas / List toggle, conditionally
mounts the right view.
21 new unit tests (layout + edges); existing 271 still pass.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
