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>

src/core/properties/PropertySchema.ts

@@ -237,12 +237,25 @@ export function shaderParamRows(project: Project, shaderId: string): PropertyDef
   return shader ? shaderParamDefs(shader.graph) : [];
 }
 
-/** The parameters of every shader in the project, one row per name – what a sprite *may* have. */
-export function allShaderParamRows(project: Project): PropertyDef[] {
-  const rows = new Map<string, PropertyDef>();
+/** A shader parameter a sprite *may* have, with the shaders that declare it under that name. */
+export interface ShaderParamRow {
+  def: PropertyDef;
+  shaders: string[];
+}
+
+/**
+ * The parameters of every shader in the project, one row per name – which sprite wears which shader
+ * is only known at runtime, so the picker offers them all and names where each one comes from.
+ */
+export function allShaderParamRows(project: Project): ShaderParamRow[] {
+  const rows = new Map<string, ShaderParamRow>();
   for (const asset of project.assets)
     if (asset.type === 'shader')
-      for (const row of shaderParamDefs(asset.graph)) if (!rows.has(row.key)) rows.set(row.key, row);
+      for (const def of shaderParamDefs(asset.graph)) {
+        const row = rows.get(def.key);
+        if (!row) rows.set(def.key, { def, shaders: [asset.name] });
+        else if (!row.shaders.includes(asset.name)) row.shaders.push(asset.name);
+      }
   return [...rows.values()];
 }