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/di/container.test.ts

@@ -4,6 +4,8 @@ import { NAVIGATION_SYMBOLS } from "./symbols";
 import { NavigationModule } from "./module";
 import { MockHeaderRepository } from "@/infrastructure/repositories/header.repository.mock";
 import type { IHeaderRepository } from "@/application/repositories/header.repository.interface";
+import type { IGetHeaderUseCase } from "@/application/use-cases/get-header.use-case";
+import type { IGetHeaderController } from "@/interface-adapters/controllers/get-header.controller";
 
 describe("navigationContainer", () => {
   beforeEach(() => {
@@ -21,4 +23,18 @@ describe("navigationContainer", () => {
     );
     expect(repo).toBeInstanceOf(MockHeaderRepository);
   });
+
+  it("resolves IGetHeaderUseCase as a function", () => {
+    const useCase = navigationContainer.get<IGetHeaderUseCase>(
+      NAVIGATION_SYMBOLS.IGetHeaderUseCase,
+    );
+    expect(typeof useCase).toBe("function");
+  });
+
+  it("resolves IGetHeaderController as a function", () => {
+    const controller = navigationContainer.get<IGetHeaderController>(
+      NAVIGATION_SYMBOLS.IGetHeaderController,
+    );
+    expect(typeof controller).toBe("function");
+  });
 });

packages/navigation/src/di/module.ts

@@ -2,10 +2,32 @@ import { ContainerModule, type interfaces } from "inversify";
 
 import type { IHeaderRepository } from "../application/repositories/header.repository.interface";
 import { MockHeaderRepository } from "../infrastructure/repositories/header.repository.mock";
+import {
+  getHeaderUseCase,
+  type IGetHeaderUseCase,
+} from "../application/use-cases/get-header.use-case";
+import {
+  getHeaderController,
+  type IGetHeaderController,
+} from "../interface-adapters/controllers/get-header.controller";
 import { NAVIGATION_SYMBOLS } from "./symbols";
 
 export const NavigationModule = new ContainerModule((bind: interfaces.Bind) => {
   bind<IHeaderRepository>(NAVIGATION_SYMBOLS.IHeaderRepository).to(
     MockHeaderRepository,
   );
+
+  bind<IGetHeaderUseCase>(NAVIGATION_SYMBOLS.IGetHeaderUseCase).toDynamicValue(
+    (ctx) =>
+      getHeaderUseCase(
+        ctx.container.get<IHeaderRepository>(NAVIGATION_SYMBOLS.IHeaderRepository),
+      ),
+  );
+
+  bind<IGetHeaderController>(NAVIGATION_SYMBOLS.IGetHeaderController).toDynamicValue(
+    (ctx) =>
+      getHeaderController(
+        ctx.container.get<IGetHeaderUseCase>(NAVIGATION_SYMBOLS.IGetHeaderUseCase),
+      ),
+  );
 });

packages/navigation/src/di/symbols.ts

@@ -1,3 +1,7 @@
 export const NAVIGATION_SYMBOLS = {
   IHeaderRepository: Symbol.for("navigation:IHeaderRepository"),
+  // Use cases
+  IGetHeaderUseCase: Symbol.for("navigation:IGetHeaderUseCase"),
+  // Controllers
+  IGetHeaderController: Symbol.for("navigation:IGetHeaderController"),
 } as const;