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

plugins/app-visualizer/report.api.md

@@ -5,7 +5,6 @@
 ```ts
 import { AnyRouteRefParams } from '@backstage/frontend-plugin-api';
 import { ConfigurableExtensionDataRef } from '@backstage/frontend-plugin-api';
-import { ExtensionBlueprintParams } from '@backstage/frontend-plugin-api';
 import { ExtensionDataRef } from '@backstage/frontend-plugin-api';
 import { ExtensionInput } from '@backstage/frontend-plugin-api';
 import { IconComponent } from '@backstage/frontend-plugin-api';
@@ -124,11 +123,9 @@ const visualizerPlugin: OverridableFrontendPlugin<
       configInput: {};
       output: ExtensionDataRef<JSX_2.Element, 'core.reactElement', {}>;
       inputs: {};
-      params: (params: {
+      params: {
         loader: () => Promise<JSX.Element>;
-      }) => ExtensionBlueprintParams<{
-        loader: () => Promise<JSX.Element>;
-      }>;
+      };
     }>;
     'sub-page:app-visualizer/details': OverridableExtensionDefinition<{
       kind: 'sub-page';

plugins/app-visualizer/src/plugin.tsx

@@ -76,11 +76,10 @@ const appVisualizerTextPage = SubPageBlueprint.make({
 });
 
 const copyTreeAsJson = PluginHeaderActionBlueprint.make({
-  params: defineParams =>
-    defineParams({
-      loader: () =>
-        import('./components/CopyTreeButton').then(m => <m.CopyTreeButton />),
-    }),
+  params: {
+    loader: () =>
+      import('./components/CopyTreeButton').then(m => <m.CopyTreeButton />),
+  },
 });
 
 export const appVisualizerNavItem = NavItemBlueprint.make({