refactor(navigation): factory-style use case + controller

- Use case (get-header) → factory function with IGetHeaderUseCase alias
- Controller renamed header.controller.ts → get-header.controller.ts (verb-noun); converted to factory function with IGetHeaderController alias
- DI module wires factories with .toDynamicValue()
- tRPC router resolves controller via container
- Use case + controller tests refactored to direct factory injection (no container rebinding)
- container.test.ts verifies IGetHeaderUseCase + IGetHeaderController symbols

Refactor log: §1, §4.1, §4.2, §5.1
Spec: §6.4

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

packages/navigation/src/interface-adapters/controllers/get-header.controller.ts

@@ -0,0 +1,10 @@
+import type { Header } from "../../entities/models/header";
+import type { IGetHeaderUseCase } from "../../application/use-cases/get-header.use-case";
+
+export type IGetHeaderController = ReturnType<typeof getHeaderController>;
+
+export const getHeaderController =
+  (getHeaderUseCase: IGetHeaderUseCase) =>
+  async (): Promise<Header> => {
+    return getHeaderUseCase();
+  };