Properties node: name each shader param by its shader (#66)

The + Property menu of the Properties node offered every shader's params
for every sprite. Each shader row now carries its shader name, and a name
shared by two shaders lists both: "brightness (Adjust colors, Neon glow)".
Sprite-owned rows stay unlabelled.

The note hangs off a map keyed by the def object, not by the name -- a
sprite property and a shader param may share a name (#63), and keying by
name would label the wrong row.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

tests/core/shaders.test.ts

@@ -13,7 +13,12 @@ import type { ShaderAsset } from '../../src/core/model/Asset';
 import { isPlaceableType } from '../../src/core/model/AssetTypes';
 import { findAssetOf } from '../../src/core/model/Project';
 import { assetDeviates, objectDeviates } from '../../src/core/properties/deviation';
-import { schemaFor, schemaForAsset, schemaForObject } from '../../src/core/properties/PropertySchema';
+import {
+  allShaderParamRows,
+  schemaFor,
+  schemaForAsset,
+  schemaForObject,
+} from '../../src/core/properties/PropertySchema';
 import { resolveSceneObjectProps } from '../../src/core/properties/resolve';
 import {
   nextPropertyName,
@@ -166,6 +171,21 @@ describe('shaderParamDefs', () => {
   });
 });
 
+describe('allShaderParamRows', () => {
+  it('offers one row per name, naming every shader that declares it', () => {
+    const f = makeProject();
+    const adjust = shaderEditor(f, 'Adjust colors');
+    adjust.add(SHADER_PROPERTY, property('brightness'));
+    const neon = shaderEditor(f, 'Neon glow');
+    neon.add(SHADER_PROPERTY, property('brightness'));
+    neon.add(SHADER_PROPERTY, property('glow'));
+    expect(allShaderParamRows(f.project).map((row) => `${row.def.key} (${row.shaders.join(', ')})`)).toEqual([
+      'brightness (Adjust colors, Neon glow)',
+      'glow (Neon glow)',
+    ]);
+  });
+});
+
 describe('compileShader', () => {
   it('compiles the Adjust colors graph to a fragment with one uniform per property', () => {
     const f = makeProject();