Three stores, three importers and three pickers that differ only in their type are one of each (#85)

Refactoring round one: HttpFontStore/HttpSoundStore/HttpTextureStore collapse into a generic
HttpFileStore over a FileStore contract; fontImport/soundImport/textureImport share assetImport
with an ImportKind per sort; ImagePicker/FontPicker/SoundPicker sit on FilePicker and describe
only their row. The group/comment drag logic leaves GraphCanvas for annotationDrag.ts (with its
own unit test), declaredRows.ts replaces the duplicated row build in particles.ts and shaders.ts,
and dead code in font/sound/compile/emission/transform/actions is gone. README: asset list,
check count 958, the two-job CI, the Scenes wiki page.

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

src/core/properties/shaders.ts

@@ -1,7 +1,15 @@
 import type { Graph, GraphNode } from '../graph/Graph';
 import { type PropertyBag, textOf } from '../model/Properties';
+import { declaredNumberRows, PROPERTY_NAME_PARAM } from './declaredRows';
 import { type FlatDef, isSpriteProp, isValidFieldName } from './PropertySchema';
 
+export {
+  PROPERTY_DEFAULT_PARAM,
+  PROPERTY_MAX_PARAM,
+  PROPERTY_MIN_PARAM,
+  PROPERTY_NAME_PARAM,
+} from './declaredRows';
+
 /** The sprite property naming the shader asset it wears; `''` is no shader and no render pass. */
 export const SHADER_KEY = 'shader';
 
@@ -10,10 +18,6 @@ export const SHADER_KEY = 'shader';
  * GLSL uniform, `default`/`min`/`max` are the row the inspector shows.
  */
 export const SHADER_PROPERTY = 'ShaderProperty';
-export const PROPERTY_NAME_PARAM = 'name';
-export const PROPERTY_DEFAULT_PARAM = 'default';
-export const PROPERTY_MIN_PARAM = 'min';
-export const PROPERTY_MAX_PARAM = 'max';
 
 export function shaderOf(bag: PropertyBag): string {
   return textOf(bag[SHADER_KEY]);
@@ -36,46 +40,13 @@ export function isValidPropertyName(name: string): boolean {
   return isValidFieldName(name) && !isSpriteProp(name);
 }
 
-/**
- * The properties a shader graph declares, in node order: one number row per `Property` node with
- * a valid name. A second node with the same name declares nothing new – both read one uniform.
- */
+/** The properties a shader graph declares: one row on the sprite and one uniform each. */
 export function shaderParamDefs(graph: Graph): FlatDef<'number'>[] {
-  const rows: FlatDef<'number'>[] = [];
-  const seen = new Set<string>();
-  for (const node of graph.nodes) {
-    if (!isPropertyNode(node)) continue;
-    const name = propertyName(node);
-    if (!isValidPropertyName(name) || seen.has(name)) continue;
-    seen.add(name);
-    rows.push(propertyRow(name, node.params));
-  }
-  return rows;
-}
-
-function propertyRow(name: string, params: PropertyBag): FlatDef<'number'> {
-  const min = numberParam(params, PROPERTY_MIN_PARAM, 0);
-  const max = numberParam(params, PROPERTY_MAX_PARAM, 1);
-  const row: FlatDef<'number'> = {
-    key: name,
-    label: name,
-    kind: 'number',
-    default: numberParam(params, PROPERTY_DEFAULT_PARAM, 0),
-    min,
-    step: niceStep(max > min ? max - min : 1),
-  };
-  // A max at or below the min would pin the value; treated as "no max" instead.
-  return max > min ? { ...row, max } : row;
-}
-
-function numberParam(params: PropertyBag, key: string, fallback: number): number {
-  const n = Number(params[key]);
-  return Number.isFinite(n) ? n : fallback;
-}
-
-/** A twentieth of the range's power of ten: 0.05 for 0-4, 0.05 for 0-1, 5 for 0-100. */
-function niceStep(range: number): number {
-  return 10 ** Math.floor(Math.log10(range)) / 20;
+  return declaredNumberRows(graph, {
+    isDeclaration: isPropertyNode,
+    nameOf: propertyName,
+    isValidName: isValidPropertyName,
+  });
 }
 
 /** What a property placed from the palette is called: `value`, then `value2`, `value3` … */