fix(insights): make the nutrients pill reachable once the module is on

The nutrients pill required BOTH the opt-in module on AND at least one
NutrientIntakeDay row — but the in-context enable CTA lives on
/insights/nutrients itself, so a user who had just turned the module on
(or wanted to) had no way to reach the page that would let them. Drop
the row-count floor for this one metric: the pill now gates on the
module toggle alone, matching the deliberate opt-in the user already
made. The page itself is unchanged and still degrades from "enable" to
"no rows yet" to the three-card spine.

src/components/insights/insights-layout-shell.tsx

@@ -106,20 +106,15 @@ export function InsightsLayoutShell({ children }: { children: ReactNode }) {
   // dashboard tile so navigation between surfaces is a free cache hit.
   const workoutsProbe = useWorkouts({ limit: 1 });
 
-  // v1.29 — nutrients-presence gate. The nutrients pill gates on at
-  // least one `NutrientIntakeDay` row in a 1-day probe window (any
-  // nutrient, any source). Enabled only when the opt-in module is on —
-  // the route 403s "module.disabled" otherwise, so probing while off
-  // would just burn a request every mount.
+  // v1.29 — nutrients gate. `nutrients` is opt-in (default off), unlike
+  // the always-on metric clusters, so the pill's floor is the module
+  // toggle alone — not a data-presence probe. Gating on BOTH the toggle
+  // AND a first row was a catch-22: the in-context enable CTA lives on
+  // `/insights/nutrients` itself, and that page was only reachable once
+  // data already existed. A user who just flipped the module on (or
+  // wants to) can now always reach the page; the page itself still
+  // degrades from "enable" → "no rows yet" → the three-card spine.
   const nutrientsEnabled = user?.modules?.nutrients === true;
-  const nutrientsProbe = useQuery({
-    queryKey: queryKeys.nutrientIntake(1),
-    queryFn: () =>
-      apiGet<{ nutrients: Array<{ nutrient: string }> }>(
-        "/api/nutrients?days=1",
-      ),
-    enabled: isAuthenticated && nutrientsEnabled,
-  });
 
   // v1.4.31 — memoise the `availability` prop so an unchanged
   // payload doesn't recreate the object on every cache-write of
@@ -132,7 +127,7 @@ export function InsightsLayoutShell({ children }: { children: ReactNode }) {
   const hasMood = (comprehensiveQuery.data?.moodSummary?.count ?? 0) > 0;
   const hasMedication = (comprehensiveQuery.data?.medications?.length ?? 0) > 0;
   const hasWorkouts = (workoutsProbe.data?.workouts.length ?? 0) > 0;
-  const hasNutrients = (nutrientsProbe.data?.nutrients.length ?? 0) > 0;
+  const hasNutrients = nutrientsEnabled;
   const availability: InsightInputs | undefined = useMemo(() => {
     if (!isAuthenticated) return undefined;
     return { summaries, hasMood, hasMedication, hasWorkouts, hasNutrients };

src/components/insights/insights-tab-strip.tsx

@@ -366,8 +366,10 @@ const SUB_PAGE_MODULE: Partial<Record<SubPageSlug, ModuleKey>> = {
   "breathing-disturbances": "sleep",
   "blood-glucose": "glucose",
   workouts: "workouts",
-  // v1.29 — the nutrients pill gates on the opt-in `nutrients` module on
-  // top of the `hasNutrients` data floor.
+  // v1.29 — the nutrients pill gates on the opt-in `nutrients` module
+  // alone; there is no data floor on top (see `hasNutrients` in
+  // `insights-layout-shell.tsx` — reachability, not row count, is the
+  // gate once the user has opted in).
   nutrients: "nutrients",
 };