fix(chat): preserve style defaults for omitted agent overrides

src/components/chat/toolCallStyleHelpers.test.ts

@@ -1,4 +1,6 @@
 import { parseApplyLayerStylePayload } from "./toolCallStyleHelpers";
+import { createDefaultLayerStyleState } from "@components/olmap/core/Controls/styleEditorPresets";
+import { validateStyleConfig } from "@components/olmap/core/Controls/styleEditorUtils";
 
 describe("parseApplyLayerStylePayload", () => {
   it("accepts a valid snake_case interval contract", () => {
@@ -47,4 +49,17 @@ describe("parseApplyLayerStylePayload", () => {
       }),
     ).toMatchObject({ layerId: "junctions", styleConfig: { opacity: 0.5 } });
   });
+
+  it("preserves default palette indexes when only some style fields are provided", () => {
+    const payload = parseApplyLayerStylePayload({
+      layer_id: "pipes",
+      style_config: { property: "flow", color_type: "gradient" },
+    });
+    expect(payload).not.toBeNull();
+    const merged = {
+      ...createDefaultLayerStyleState("pipes").styleConfig,
+      ...payload?.styleConfig,
+    };
+    expect(validateStyleConfig(merged)).toEqual({ valid: true, errors: [] });
+  });
 });

src/components/chat/toolCallStyleHelpers.ts

@@ -198,10 +198,15 @@ export const parseApplyLayerStylePayload = (
     ) return null;
   }
 
+  const definedStyleConfig = styleConfig
+    ? (Object.fromEntries(
+        Object.entries(styleConfig).filter(([, value]) => value !== undefined),
+      ) as Partial<StyleConfig>)
+    : undefined;
   const hasStyleOverrides =
-    styleConfig &&
-    Object.values(styleConfig).some((value) =>
-      Array.isArray(value) ? value.length > 0 : value !== undefined,
+    definedStyleConfig &&
+    Object.values(definedStyleConfig).some((value) =>
+      Array.isArray(value) ? value.length > 0 : true,
     );
 
   if (!resetToDefault && !hasStyleOverrides) {
@@ -211,7 +216,7 @@ export const parseApplyLayerStylePayload = (
   return {
     layerId,
     resetToDefault,
-    styleConfig: hasStyleOverrides ? styleConfig : undefined,
+    styleConfig: hasStyleOverrides ? definedStyleConfig : undefined,
   };
 };