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/integrations/api/router.test.ts

@@ -1,20 +1,7 @@
-import { beforeEach, describe, expect, it } from "vitest";
-import { navigationContainer } from "@/di/container";
-import { NAVIGATION_SYMBOLS } from "@/di/symbols";
-import { MockHeaderRepository } from "@/infrastructure/repositories/header.repository.mock";
-import type { IHeaderRepository } from "@/application/repositories/header.repository.interface";
+import { describe, expect, it } from "vitest";
 import { navigationRouter } from "./router";
 
 describe("navigationRouter", () => {
-  beforeEach(() => {
-    if (navigationContainer.isBound(NAVIGATION_SYMBOLS.IHeaderRepository)) {
-      navigationContainer.unbind(NAVIGATION_SYMBOLS.IHeaderRepository);
-    }
-    navigationContainer
-      .bind<IHeaderRepository>(NAVIGATION_SYMBOLS.IHeaderRepository)
-      .toConstantValue(new MockHeaderRepository());
-  });
-
   it("exposes header procedure", () => {
     const names = Object.keys(navigationRouter._def.procedures);
     expect(names).toContain("header");

packages/navigation/src/integrations/api/router.ts

@@ -1,8 +1,15 @@
 import { router, publicProcedure } from "@repo/core-shared/trpc/init";
-import { getHeaderController } from "../../interface-adapters/controllers/header.controller";
+import { navigationContainer } from "../../di/container";
+import { NAVIGATION_SYMBOLS } from "../../di/symbols";
+import type { IGetHeaderController } from "../../interface-adapters/controllers/get-header.controller";
 
 export const navigationRouter = router({
-  header: publicProcedure.query(() => getHeaderController()),
+  header: publicProcedure.query(() => {
+    const ctrl = navigationContainer.get<IGetHeaderController>(
+      NAVIGATION_SYMBOLS.IGetHeaderController,
+    );
+    return ctrl();
+  }),
 });
 
 export type NavigationRouter = typeof navigationRouter;