test: add feature branch to storybook mock branch list

Extend listBranches mock response with a feature branch example
to better represent realistic branch listings during component
development and testing.

Author: ThomasK33

.storybook/mocks/orpc.ts

@@ -84,7 +84,7 @@ export function createMockORPCClient(options: MockORPCClientOptions = {}): ORPCC
       }),
       pickDirectory: async () => null,
       listBranches: async () => ({
-        branches: ["main", "develop"],
+        branches: ["main", "develop", "feature/new-feature"],
         recommendedTrunk: "main",
       }),
       remove: async () => ({ success: true, data: undefined }),