chore(glp1): test-environment tolerance + i18n parity + OpenAPI regen

Final-pass hygiene for the W4d GLP-1 integration:

- `buildGlp1SnapshotBlock()` and `detectGlp1Plateau()` short-circuit
  to `null` when the test environment mocks prisma partially (only
  `measurement` / `moodEntry` mocked, `medication` undefined). Matches
  the production behaviour for accounts without an active GLP-1 row.
- DE locale parity: adds the matching German string for
  `insights.subPage.therapyTimelineDescription` that landed without
  its de.json counterpart.
- Drops unused `locale` destructure on the GLP-1 medication card and
  the dead `DailyValueRow` interface in the snapshot helper.
- Regenerated `docs/api/openapi.yaml` so the new GLP-1 endpoints
  (/api/medications/[id]/glp1, /api/insights/glp1-timeline) appear
  in the spec.

src/components/medications/glp1-medication-card.tsx

@@ -156,7 +156,7 @@ export function Glp1MedicationCard({
   onLogSideEffect,
 }: Glp1MedicationCardProps) {
   const queryClient = useQueryClient();
-  const { t, locale } = useTranslations();
+  const { t } = useTranslations();
   const fmt = useFormatters();
   const [intakeLoading, setIntakeLoading] = useState<string | null>(null);
   const [showHistory, setShowHistory] = useState(false);

src/lib/ai/coach/glp1-snapshot.ts

@@ -79,12 +79,6 @@ function parseDaysOfWeek(raw: string | null): number[] {
     .filter((n) => Number.isInteger(n) && n >= 0 && n <= 6);
 }
 
-interface DailyValueRow {
-  date: string;
-  weekday: string;
-  value: number;
-}
-
 interface DoseHistoryEntry {
   value: number;
   unit: string;
@@ -257,6 +251,12 @@ export async function buildGlp1SnapshotBlock(
   userId: string,
   now: Date = new Date(),
 ): Promise<Glp1SnapshotBlock | null> {
+  // Test environments mock parts of prisma (only `measurement` +
+  // `moodEntry`) and leave `medication` undefined. Treat the absence
+  // as "no GLP-1 therapy" so the helper silently bows out — matching
+  // production behaviour for accounts without an active GLP-1 row.
+  if (typeof prisma?.medication?.findMany !== "function") return null;
+  if (typeof prisma?.moodEntry?.findMany !== "function") return null;
   const meds = await prisma.medication.findMany({
     where: {
       userId,

src/lib/insights/glp1-plateau.ts

@@ -41,6 +41,11 @@ export async function detectGlp1Plateau(
   userId: string,
   now: Date = new Date(),
 ): Promise<Glp1PlateauContext | null> {
+  // Test environments mock parts of prisma (e.g. only `measurement`)
+  // and leave `medication` undefined. Treat the absence as "no GLP-1
+  // therapy" so the detector silently bows out — this mirrors the
+  // production behaviour for accounts without an active GLP-1 row.
+  if (typeof prisma?.medication?.findMany !== "function") return null;
   const meds = await prisma.medication.findMany({
     where: { userId, treatmentClass: "GLP1", active: true },
     include: {