fix(ui): keep default provenance proof type-safe

ui/src/components/config-form.node.collection.ts

@@ -56,7 +56,13 @@ import { renderSettingsEmpty } from "./settings-ui.ts";
 const UNSET_ARRAY_SOURCE_IDENTITY = Symbol("unset-array-source");
 const UNSET_MAP_SOURCE_IDENTITY = Symbol("unset-map-source");
 
-function collectionDefaultPresentation(params: ConfigNodeRenderParams, effectiveValue: unknown) {
+function collectionDefaultPresentation(
+  params: ConfigNodeRenderParams,
+  effectiveValue: unknown,
+): {
+  description: TemplateResult | typeof nothing;
+  action: TemplateResult | typeof nothing;
+} {
   const redacted = getSensitiveRenderState({
     path: params.path,
     value: effectiveValue,

ui/src/pages/model-providers/model-providers-page.test.ts

@@ -237,7 +237,7 @@ describe("ModelProvidersPage agent scope", () => {
     const { context, runtimeConfig } = createHarness("main");
     runtimeConfig.state.configForm = {
       agents: { defaults: { thinkingDefault: 42, fastModeDefault: "bogus" } },
-    };
+    } as unknown as typeof runtimeConfig.state.configForm;
     const page = appendPage(context);
     await vi.waitFor(() => expect(page.querySelector("#settings-model-behavior")).not.toBeNull());