frontend-plugin-api: remove defineParams from PluginHeaderActionBlueprint

Replace the defineParams + createExtensionBlueprintParams pattern with
inline param types on the factory, matching PageBlueprint, SubPageBlueprint,
and other blueprints. Update the app-visualizer usage accordingly.

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>
Made-with: Cursor

packages/frontend-plugin-api/report.api.md

@@ -1951,11 +1951,9 @@ export type PendingOAuthRequest = {
 // @public
 export const PluginHeaderActionBlueprint: ExtensionBlueprint_2<{
   kind: 'plugin-header-action';
-  params: (params: {
+  params: {
     loader: () => Promise<JSX.Element>;
-  }) => ExtensionBlueprintParams_2<{
-    loader: () => Promise<JSX.Element>;
-  }>;
+  };
   output: ExtensionDataRef_2<JSX_2, 'core.reactElement', {}>;
   inputs: {};
   config: {};

packages/frontend-plugin-api/src/blueprints/PluginHeaderActionBlueprint.tsx

@@ -16,11 +16,7 @@
 
 import { lazy as reactLazy } from 'react';
 import { ExtensionBoundary } from '../components';
-import {
-  coreExtensionData,
-  createExtensionBlueprint,
-  createExtensionBlueprintParams,
-} from '../wiring';
+import { coreExtensionData, createExtensionBlueprint } from '../wiring';
 
 /**
  * Creates extensions that provide plugin-scoped header actions.
@@ -36,10 +32,7 @@ export const PluginHeaderActionBlueprint = createExtensionBlueprint({
   kind: 'plugin-header-action',
   attachTo: { id: 'api:app/plugin-header-actions', input: 'actions' },
   output: [coreExtensionData.reactElement],
-  defineParams(params: { loader: () => Promise<JSX.Element> }) {
-    return createExtensionBlueprintParams(params);
-  },
-  *factory(params, { node }) {
+  *factory(params: { loader: () => Promise<JSX.Element> }, { node }) {
     const LazyAction = reactLazy(() =>
       params.loader().then(element => ({ default: () => element })),
     );