Stub the custom category read in the export route tests

The full backup now reads the account's own medication categories, and
three route tests that drive the payload builder against a mocked client
had no delegate for it.

src/app/api/export/__tests__/per-type-routes.test.ts

@@ -23,6 +23,9 @@ vi.mock("@/lib/db", () => ({
     passkey: { count: vi.fn(async () => 0) },
     measurement: { findMany: vi.fn() },
     medication: { findMany: vi.fn() },
+    // v1.40 — the custom medication categories the backup carries.
+    medicationCategoryLabel: { findMany: vi.fn().mockResolvedValue([]) },
+    medicationCategoryAssignment: { findMany: vi.fn().mockResolvedValue([]) },
     medicationIntakeEvent: { findMany: vi.fn() },
     moodEntry: { findMany: vi.fn() },
     moodTag: { findMany: vi.fn() },
@@ -129,6 +132,9 @@ beforeEach(() => {
   // `resetAllMocks` clears the inline defaults, and the full-backup payload
   // builder reads these unconditionally.
   vi.mocked(prisma.nutrientIntakeDay.findMany).mockResolvedValue([] as never);
+  vi.mocked(prisma.medicationCategoryLabel.findMany).mockResolvedValue(
+    [] as never,
+  );
   vi.mocked(prisma.userHealthProfile.findUnique).mockResolvedValue(
     null as never,
   );

src/app/api/export/__tests__/soft-delete-filter.test.ts

@@ -22,6 +22,9 @@ vi.mock("@/lib/db", () => ({
     $queryRaw: vi.fn(),
     measurement: { findMany: vi.fn(), count: vi.fn() },
     medication: { findMany: vi.fn() },
+    // v1.40 — the custom medication categories the backup carries.
+    medicationCategoryLabel: { findMany: vi.fn().mockResolvedValue([]) },
+    medicationCategoryAssignment: { findMany: vi.fn().mockResolvedValue([]) },
     medicationIntakeEvent: { findMany: vi.fn(), count: vi.fn() },
     moodEntry: { findMany: vi.fn(), count: vi.fn() },
     moodTag: { findMany: vi.fn() },

src/app/api/export/encrypted/__tests__/route.test.ts

@@ -12,6 +12,9 @@ vi.mock("@/lib/db", () => ({
   prisma: {
     measurement: { findMany: vi.fn().mockResolvedValue([]) },
     medication: { findMany: vi.fn().mockResolvedValue([]) },
+    // v1.40 — the custom medication categories the backup carries.
+    medicationCategoryLabel: { findMany: vi.fn().mockResolvedValue([]) },
+    medicationCategoryAssignment: { findMany: vi.fn().mockResolvedValue([]) },
     medicationIntakeEvent: { findMany: vi.fn().mockResolvedValue([]) },
     moodEntry: { findMany: vi.fn().mockResolvedValue([]) },
     moodTag: { findMany: vi.fn().mockResolvedValue([]) },