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

Per Plan 9 (spec R1-R28):
- Use cases: input + output schemas (getPageBySlug, getSiteSettings).
  Site-settings input is z.object({}).strict() per R5 (uniform input).
- Controllers: unknown input + identity presenter; void output not
  applicable (both use cases return data).
- New integrations/api/procedures.ts with marketingPagesProcedure
  ([InputParseError → BAD_REQUEST], [PageNotFoundError → NOT_FOUND]).
- Router uses marketingPagesProcedure + .input(xInputSchema).
- src/index.ts: remove pageBySlugQuery/siteSettingsQuery; export
  schemas + types + IUseCase/IController aliases.
- src/ui/index.ts (NEW); package.json adds ./ui subpath.
- R25 output-validation tests + R26 router error-mapping test.

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/marketing-pages/src/integrations/api/procedures.ts

@@ -0,0 +1,12 @@
+import { t } from "@repo/core-shared/trpc/init";
+import { defineErrorMiddleware } from "@repo/core-shared/trpc/define-error-middleware";
+
+import { PageNotFoundError } from "../../entities/errors/page";
+import { InputParseError } from "../../entities/errors/common";
+
+export const marketingPagesProcedure = t.procedure.use(
+  defineErrorMiddleware([
+    [InputParseError, "BAD_REQUEST"],
+    [PageNotFoundError, "NOT_FOUND"],
+  ]),
+);

packages/marketing-pages/src/integrations/api/router.test.ts

@@ -1,7 +1,19 @@
-import { describe, it, expect } from "vitest";
-import { marketingPagesRouter } from "./router";
+import { afterEach, beforeEach, describe, expect, it } from "vitest";
+import { TRPCError } from "@trpc/server";
+import { marketingPagesContainer } from "@/di/container";
+import { MarketingPagesModule } from "@/di/module";
+import { marketingPagesRouter } from "@/integrations/api/router";
 
 describe("marketingPagesRouter", () => {
+  beforeEach(() => {
+    marketingPagesContainer.unbindAll();
+    marketingPagesContainer.load(MarketingPagesModule);
+  });
+
+  afterEach(() => {
+    marketingPagesContainer.unbindAll();
+  });
+
   it("exposes pageBySlug + siteSettings procedures", () => {
     const names = Object.keys(marketingPagesRouter._def.procedures);
     expect(names).toContain("pageBySlug");
@@ -16,7 +28,35 @@ describe("marketingPagesRouter", () => {
 
   it("siteSettings returns site name", async () => {
     const caller = marketingPagesRouter.createCaller({});
-    const result = await caller.siteSettings();
+    const result = await caller.siteSettings({});
     expect(result.siteName).toBe("My App");
   });
 });
+
+describe("marketingPagesRouter (R26 error mapping)", () => {
+  beforeEach(() => {
+    marketingPagesContainer.unbindAll();
+    marketingPagesContainer.load(MarketingPagesModule);
+  });
+
+  afterEach(() => {
+    marketingPagesContainer.unbindAll();
+  });
+
+  it("translates zod parse failure → BAD_REQUEST on pageBySlug", async () => {
+    const caller = marketingPagesRouter.createCaller({});
+    try {
+      await caller.pageBySlug({} as unknown as { slug: string });
+      throw new Error("expected throw");
+    } catch (e) {
+      expect(e).toBeInstanceOf(TRPCError);
+      expect((e as TRPCError).code).toBe("BAD_REQUEST");
+    }
+  });
+
+  it("returns undefined (not NOT_FOUND) for missing slug since use case returns undefined", async () => {
+    const caller = marketingPagesRouter.createCaller({});
+    const result = await caller.pageBySlug({ slug: "does-not-exist" });
+    expect(result).toBeUndefined();
+  });
+});

packages/marketing-pages/src/integrations/api/router.ts

@@ -1,13 +1,19 @@
-import { z } from "zod";
-import { router, publicProcedure } from "@repo/core-shared/trpc/init";
+import { router } from "@repo/core-shared/trpc/init";
+
 import { marketingPagesContainer } from "../../di/container";
 import { MARKETING_PAGES_SYMBOLS } from "../../di/symbols";
+
+import { getPageBySlugInputSchema } from "../../application/use-cases/get-page-by-slug.use-case";
+import { getSiteSettingsInputSchema } from "../../application/use-cases/get-site-settings.use-case";
+
 import type { IGetPageBySlugController } from "../../interface-adapters/controllers/get-page-by-slug.controller";
 import type { IGetSiteSettingsController } from "../../interface-adapters/controllers/get-site-settings.controller";
 
+import { marketingPagesProcedure } from "./procedures";
+
 export const marketingPagesRouter = router({
-  pageBySlug: publicProcedure
-    .input(z.object({ slug: z.string().min(1) }))
+  pageBySlug: marketingPagesProcedure
+    .input(getPageBySlugInputSchema)
     .query(({ input }) => {
       const ctrl = marketingPagesContainer.get<IGetPageBySlugController>(
         MARKETING_PAGES_SYMBOLS.IGetPageBySlugController,
@@ -15,12 +21,14 @@ export const marketingPagesRouter = router({
       return ctrl(input);
     }),
 
-  siteSettings: publicProcedure.query(() => {
-    const ctrl = marketingPagesContainer.get<IGetSiteSettingsController>(
-      MARKETING_PAGES_SYMBOLS.IGetSiteSettingsController,
-    );
-    return ctrl();
-  }),
+  siteSettings: marketingPagesProcedure
+    .input(getSiteSettingsInputSchema)
+    .query(({ input }) => {
+      const ctrl = marketingPagesContainer.get<IGetSiteSettingsController>(
+        MARKETING_PAGES_SYMBOLS.IGetSiteSettingsController,
+      );
+      return ctrl(input);
+    }),
 });
 
 export type MarketingPagesRouter = typeof marketingPagesRouter;