Closes the trilogy. Three high-value gaps from PRs 2a/2b addressed:
1. Canvas users couldn't save. The Header (with Save / Activate /
Pause / Delete buttons) lived inside FlowBuilder so canvas-only
users had to toggle to List to persist any edit. Lifted into a
new components/flows/header.tsx that consumes useFlowEditor()
and is mounted ONCE in FlowEditorShell, above both views.
2. Validator issues weren't clickable from canvas. The
ValidationPanel was also FlowBuilder-internal. Lifted into
components/flows/validation-panel.tsx + mounted in the shell,
pinned sticky-bottom in either view. Clicks now go through the
editor context's new requestFlash(key) — both views subscribe:
- List view derives an "expanded with flash" set + an effect
scrolls the row into view. The flash class is rendered when
the card's key matches context.flashKey.
- Canvas view's pan-on-flash effect calls
reactFlow.setCenter() to bring the node into the viewport,
and the card renders an amber ring while flashed.
The flash auto-clears in the context after 1600ms; rapid
clicks on different issues cancel the previous timeout.
3. Canvas was unusable on phones — handles are ~10px and live
finger-drags between them aren't a practical workflow. Added
a useMatchMedia('(max-width: 767px)') guard in the shell that
forces list view and hides the toggle below the breakpoint.
The user's preferred view is preserved (just shadowed) so it
comes back when they widen.
Plus minor cleanup: the canvas's empty-state used to direct users
to switch to List view to add a node, but the floating "+" button
shipped in PR 2b made that stale — now shows the same Add-node
dropdown inline.
flow-builder.tsx shrinks by another ~370 lines (Header + StatusBadge
+ ValidationPanel + IssueLine + the local flashedKey + jumpToNode
all moved or replaced by context subscription).
No new tests — the change is structural + UI-only. Existing 319
still pass; typecheck, lint, build all clean.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
