fix(discover): map TV date sorts, clamp TMDB page counts, and pause infinite scroll after a failed page

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

apps/server/test/discover-utils.test.ts

@@ -0,0 +1,36 @@
+import { describe, expect, test } from "vitest";
+
+import { clampTotalPages, tmdbSortBy } from "../src/orpc/procedures/discover-utils";
+
+describe("clampTotalPages", () => {
+  test("defaults to 1 when undefined", () => {
+    expect(clampTotalPages(undefined)).toBe(1);
+  });
+
+  test("passes through values under the cap", () => {
+    expect(clampTotalPages(42)).toBe(42);
+  });
+
+  test("caps at 500", () => {
+    expect(clampTotalPages(1234)).toBe(500);
+  });
+});
+
+describe("tmdbSortBy", () => {
+  test("maps TV date sorts to first_air_date", () => {
+    expect(tmdbSortBy("tv", "primary_release_date.desc")).toBe("first_air_date.desc");
+    expect(tmdbSortBy("tv", "primary_release_date.asc")).toBe("first_air_date.asc");
+  });
+
+  test("leaves movie date sorts unchanged", () => {
+    expect(tmdbSortBy("movie", "primary_release_date.desc")).toBe("primary_release_date.desc");
+  });
+
+  test("defaults to popularity.desc", () => {
+    expect(tmdbSortBy("tv", undefined)).toBe("popularity.desc");
+  });
+
+  test("leaves other TV sorts unchanged", () => {
+    expect(tmdbSortBy("tv", "vote_average.desc")).toBe("vote_average.desc");
+  });
+});