Resolve canvas vertices, ids, and style scope in one pass

[kmcginnes]

Description

Three passes over the canvas vertices become one, and the resolver layer from #2119 collapses.

The visible-ids atom iterated every vertex; the style-scope atom iterated them again re-testing membership; useRenderedVertices iterated a third time re-testing it once more. Two passes existed only to re-discover a decision the first had already made. canvasVerticesAtom returns the drawn vertices, their ids, and the styles of the types they draw from a single loop.

That also removes the reason a missing icon used to be silent. Style data was assembled from two inputs of different totality — scalar fields from a lookup that answers for any type, the icon from a partial scope list — so resolveStyleData(type) always succeeded and always looked plausible, and a scope miss was indistinguishable from a type that genuinely has no icon. Now a drawn vertex's primaryType is in stylesByType by construction (same loop), the style data derives entirely from that scoped list, and a type absent from it throws rather than quietly drawing a node without its icon.

The memoizing resolver layer goes with it: five exported symbols, two factories and two cache closures replaced by one hook returning a plain per-type map. The lazy memoization bought nothing because every caller knows its full key set up front — and the resolver function shape is what forced the total-lookup dependency, since a function must answer for any argument where a map need not.

The edge half is inlined rather than kept as a hook: the drawn edge types are only knowable while filtering, so producing them up front would need the extra pass this PR removes. Each consumer fills a per-render map on first sight of a type inside its existing loop — still one Color parse per type rather than per edge.

Iteration order is unchanged; rendered vertices stay in canvas insertion order.

How to read

1. renderedEntities.ts — canvasVerticesAtom, then the two hooks.
2. styleDataResolvers.ts — down to a single hook.
3. useSchemaGraphData.ts — mirrors the same invariant assertion.

[kmcginnes]

Superseded by #2128, which consolidates this stack into a single PR targeting #2112. Same commits, same end state — the branch there is byte-identical to the tree these were cut from, rebased onto schema-view-style-perf after #2118 was squash-merged into it.