feat(FN-3883): fix dependency-graph plugin exports and add CLI bundle entry

Fixed the `@fusion-plugin/dependency-graph` plugin's exports and build entry points so it bundles correctly with the CLI, added test coverage for plugin enable success and error-state toasts, and included the plugin's dist in the CLI bundle via tsup config.

Fusion-Task-Id: FN-3883

plugins/fusion-plugin-dependency-graph/src/dashboard-view.tsx

@@ -16,4 +16,6 @@ export function DependencyGraphDashboardView({ context }: { context?: PluginDash
   });
 }
 
+export default DependencyGraphDashboardView;
+
 export { DependencyGraph };