The Invariant 'component type (undefined) does not exist in the resolver'
was Craft.js's toNodeTree choking on the linkedNode that <Element id="X">
auto-creates at render time inside Section / BackgroundSection /
FormContainer. The auto-created node stores its type as the Container
React component class itself, not as {resolvedName:'Container'}, so the
later type.resolvedName lookup returns undefined.
For each shell, treeToState (and apply-ai-response's buildNodeTree) now
synthesizes the linkedNode container up-front with a proper serialized
type, moves the AI's direct children into it, and reparents them. This
matches the canonical shape Craft.js writes when the user manually builds
a site, so Craft.js never has to materialize the linkedNode itself.
The canonical Craft.js state from real saves shows that layout shells
(Section, BackgroundSection, HeroSimple, FeaturesGrid, ColumnLayout,
CTASection, FormContainer, Navbar, Footer) all serialize with
isCanvas:false. Only Container instances are canvases. The shells use
internal <Element canvas id="..."> linkedNodes for their drop targets.
Our previous CANVAS_TYPES set claimed all those shells were canvases,
which made Craft.js's toNodeTree walker hit an uncaught Invariant —
the shell asserted "I'm a canvas" but its render ignores data.nodes,
so the walker would chase phantom children.
ColumnLayout's render uses <Element id="col-0" is={Container} canvas>
which expects the columns to live in linkedNodes, not data.nodes. The
AI nests its column containers as direct children, so they'd land in
data.nodes — Craft.js's render ignores them (the layout draws fresh
empty Elements), but the orphaned children remain in state with
parent: <columnlayout-id>. Any subsequent toNodeTree walk then trips
on this inconsistency and the uncaught Invariant kills the editor.
Normalizer added in two places — treeToState (for scope=site/page
replaces) and buildNodeTree (for scope=section inserts and patch ops):
when we see a ColumnLayout with direct children, move them into
linkedNodes keyed col-0/col-1/col-2..., clear data.nodes, set the
column nodes' isCanvas to true (they hold content), and sync the
"columns" prop to the actual count.
