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>

tests/core/node-catalog.test.ts

@@ -231,6 +231,10 @@ const CASES: Record<string, Case[]> = {
     { name: 'outputs its setting', params: { value: 'hello' }, outputs: { value: 'hello' } },
     { name: 'unset is empty', outputs: { value: '' } },
   ],
+  Texture: [
+    { name: 'outputs the id it was set to', params: { value: 'fr-0-1' }, outputs: { value: 'fr-0-1' } },
+    { name: 'unset is no picture', outputs: { value: '' } },
+  ],
   Add: [
     { name: 'adds', inputs: { a: 2, b: 3 }, outputs: { result: 5 } },
     { name: 'numeric text is coerced', inputs: { a: '2', b: 3 }, outputs: { result: 5 } },