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/nodes/shared.ts

@@ -14,6 +14,15 @@ export const any = (key: string, label = key): PortDef => ({ key, label, type: '
 
 export const withDefault = (port: PortDef, value: PropertyValue): PortDef => ({ ...port, default: value });
 
+/** A whole-number input (an index, a count): its field shows no decimals, the node floors it anyway. */
+export const int = (key: string, value = 0): PortDef => ({
+  key,
+  label: key,
+  type: 'number',
+  default: value,
+  field: { key, label: key, kind: 'number', default: value, step: 1, decimals: 0 },
+});
+
 /** Outputs of the three collision events: the other body, its collider and the own collider. */
 export const collisionOutputs = (): PortDef[] => [
   exec(),