Mock the two new route dependencies, and cover the dead switch

Both routes 500'd in their unit tests because the change gave them
dependencies the mocks did not know about: the widgets GET reads a module
flag and probes for an SDNN row, and the analytics slim slice resolves the
module map. Neither test mocks `@/lib/modules/gate`, and the widgets test's
prisma double has no `measurement` model — so both calls threw and the
handler answered 500. Real breakage from this branch, not stale
expectations.

The widgets GET no longer resolves the whole module map for one answer.
`hrv` is the only conditionally-dead widget and `recovery` the only module
that decides it, so it reads that one flag through `isModuleEnabled`, the
way this route's neighbours read a single flag.

Both gate mocks spread the real module so only the one call is stubbed;
everything else that imports it keeps live behaviour. The widgets
`beforeEach` states the modules-on default explicitly, because
`resetAllMocks` strips a factory's implementation and every test below
assumes it.

Added coverage for the behaviour itself rather than only unbreaking the
suite: recovery off with no SDNN marks `hrv` unavailable, an account WITH
SDNN keeps the toggle, and recovery on does not run the probe at all — the
one added read on a hot cached route must not touch the common account.

src/__tests__/api/analytics/since-cap.test.ts

@@ -50,6 +50,19 @@ vi.mock("@/lib/db-compat", () => ({
 
 vi.mock("@/lib/logging/transports", () => ({ emitIfSampled: vi.fn() }));
 
+// The slim slice now strips disabled-module types before answering, from
+// the same map the snapshot builder gates on — so it resolves the module
+// map. Spread the real module so only that call is stubbed.
+vi.mock("@/lib/modules/gate", async (importOriginal) => {
+  const actual = await importOriginal<typeof import("@/lib/modules/gate")>();
+  return {
+    ...actual,
+    resolveModuleMap: vi.fn(async () =>
+      Object.fromEntries(actual.MODULE_KEYS.map((k) => [k, true])),
+    ),
+  };
+});
+
 vi.mock("next/headers", () => ({
   headers: vi.fn(async () => ({ get: () => null })),
   cookies: vi.fn(async () => ({