refactor(navigation): unify use-case I/O schemas + presenter + feature error map

Per Plan 9 (spec R1-R28):
- getHeader use case: input z.object({}).strict() (R5); output =
  headerSchema parsed at runtime.
- getHeader controller: unknown input + identity presenter.
- New integrations/api/procedures.ts with navigationProcedure
  ([InputParseError → BAD_REQUEST], [HeaderNotFoundError → NOT_FOUND]).
- Router uses navigationProcedure + .input(getHeaderInputSchema).
- src/index.ts: remove headerQuery; export schemas + IUseCase/Controller
  aliases.
- src/ui/index.ts (NEW); package.json adds ./ui subpath.
- R25 + R26 tests added.

Refactor log: §1, §2, §3.1, §3.2, §3.3, §5.1, §5.2, §6.1, §6.2
Spec: R1–R6, R8–R15, R18–R20, R22–R26

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

@@ -1,10 +1,23 @@
-import type { Header } from "../../entities/models/header";
-import type { IGetHeaderUseCase } from "../../application/use-cases/get-header.use-case";
+import { InputParseError } from "../../entities/errors/common";
+import {
+  getHeaderInputSchema,
+  type GetHeaderOutput,
+  type IGetHeaderUseCase,
+} from "../../application/use-cases/get-header.use-case";
+
+function presenter(value: GetHeaderOutput) {
+  return value;
+}
 
 export type IGetHeaderController = ReturnType<typeof getHeaderController>;
 
 export const getHeaderController =
   (getHeaderUseCase: IGetHeaderUseCase) =>
-  async (): Promise<Header> => {
-    return getHeaderUseCase();
+  async (input: unknown): Promise<ReturnType<typeof presenter>> => {
+    const parsed = getHeaderInputSchema.safeParse(input);
+    if (!parsed.success) {
+      throw new InputParseError("Invalid get-header input", { cause: parsed.error });
+    }
+    const result = await getHeaderUseCase(parsed.data);
+    return presenter(result);
   };