Make texture and colour full kinds and drop the load-time migrations

- `Texture` and `Color` can be picked as a variable kind, a struct field
  kind and a declared port kind; a new `Texture` node hands a picture id
  into the graph. Declared, a texture is its bare id – the `$texture` tag
  stays a list-only thing.
- The `String` node is labelled "Text" like its kind; the type id stays.
- Whole-number inputs (`Item at`, `Set item`, `Sub list`, `Fill`,
  `Repeat`, `Substring`, `To text`) show no decimals (`int()` in shared.ts).
- All server projects are reseeded, so `legacyNodes.ts`,
  `migrateDeclaredLists` and the `ownerId` fallback go, with their tests.
- Note `reseed-because-of-list` moved to done/; new note `refactor-types`.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

src/core/graph/variablePorts.ts

@@ -2,19 +2,13 @@ import { itemKindOf, structItemFields } from '../properties/listItems';
 import type { PropertyDef, StructFieldDef } from '../properties/PropertySchema';
 import { DECLARED_PORT_KINDS, type DeclaredPort, type DeclaredPortKind, type GraphNode } from './Graph';
 
-/** The port a variable or property travels on. A color is a number; an enum or a texture is text. */
+/** The port a variable or property travels on. An enum, a key or an asset is text. */
 export function portKindOf(def: PropertyDef): DeclaredPortKind {
-  if (def.kind === 'color') return 'number';
   return (DECLARED_PORT_KINDS as readonly string[]).includes(def.kind)
     ? (def.kind as DeclaredPortKind)
     : 'text';
 }
 
-/** A color is a number in the value model, and the graph has no port kind of its own for it. */
-export function fieldPortKind(field: StructFieldDef): DeclaredPortKind {
-  return field.kind === 'color' ? 'number' : field.kind;
-}
-
 /**
  * The bundle shape of a variable, if it has one: a struct variable declares it, a list takes it from
  * the first struct item its default holds – items declare nothing, so the value is the only source.
@@ -33,5 +27,5 @@ export function structShapeOf(def: PropertyDef): readonly StructFieldDef[] | und
  */
 export function missingFieldPorts(node: GraphNode, fields: readonly StructFieldDef[]): DeclaredPort[] {
   const taken = new Set((node.ports ?? []).map((p) => p.key));
-  return fields.filter((f) => !taken.has(f.key)).map((f) => ({ key: f.key, kind: fieldPortKind(f) }));
+  return fields.filter((f) => !taken.has(f.key)).map((f) => ({ key: f.key, kind: f.kind }));
 }