fix(labs): stop projecting lab trends from stale or short series

A marker whose newest reading is more than a year old is now reported
as of that reading (projection "stale"), with no exit date and no
already-outside verdict. The projection horizon is capped at the span
the readings cover, so a line is never carried further ahead than the
data reaches back. The detail read keeps the newest 2000 readings
rather than the oldest.

src/app/api/biomarkers/[id]/route.ts

@@ -74,7 +74,9 @@ export const GET = apiHandler(
           deletedAt: null,
           value: { not: null },
         },
-        orderBy: { takenAt: "asc" },
+        // Newest first, so a capped read keeps the recent end of the series
+        // (the staleness check reads the newest reading); the fit sorts.
+        orderBy: { takenAt: "desc" },
         take: LAB_TREND_READ_CAP,
         select: { takenAt: true, value: true },
       }),