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/application/use-cases/get-header.use-case.test.ts

@@ -1,22 +1,12 @@
-import { beforeEach, describe, expect, it } from "vitest";
-import { navigationContainer } from "@/di/container";
-import { NAVIGATION_SYMBOLS } from "@/di/symbols";
+import { describe, expect, it } from "vitest";
+import { getHeaderUseCase } from "@/application/use-cases/get-header.use-case";
 import { MockHeaderRepository } from "@/infrastructure/repositories/header.repository.mock";
-import type { IHeaderRepository } from "@/application/repositories/header.repository.interface";
-import { getHeaderUseCase } from "./get-header.use-case";
 
 describe("getHeaderUseCase", () => {
-  beforeEach(() => {
-    if (navigationContainer.isBound(NAVIGATION_SYMBOLS.IHeaderRepository)) {
-      navigationContainer.unbind(NAVIGATION_SYMBOLS.IHeaderRepository);
-    }
-    navigationContainer
-      .bind<IHeaderRepository>(NAVIGATION_SYMBOLS.IHeaderRepository)
-      .toConstantValue(new MockHeaderRepository());
-  });
-
   it("returns the seeded header items", async () => {
-    const result = await getHeaderUseCase();
+    const repo = new MockHeaderRepository();
+    const useCase = getHeaderUseCase(repo);
+    const result = await useCase();
     expect(result.items.length).toBeGreaterThan(0);
     expect(result.items[0]?.label).toBe("Home");
   });

packages/navigation/src/application/use-cases/get-header.use-case.ts

@@ -1,11 +1,10 @@
 import type { Header } from "../../entities/models/header";
-import { navigationContainer } from "../../di/container";
-import { NAVIGATION_SYMBOLS } from "../../di/symbols";
 import type { IHeaderRepository } from "../repositories/header.repository.interface";
 
-export async function getHeaderUseCase(): Promise<Header> {
-  const repo = navigationContainer.get<IHeaderRepository>(
-    NAVIGATION_SYMBOLS.IHeaderRepository,
-  );
-  return repo.getHeader();
-}
+export type IGetHeaderUseCase = ReturnType<typeof getHeaderUseCase>;
+
+export const getHeaderUseCase =
+  (headerRepository: IHeaderRepository) =>
+  async (): Promise<Header> => {
+    return headerRepository.getHeader();
+  };