fix(calendar): show unscheduled markers on future days off

src/components/design-system/CalendarHeatmap.tsx

@@ -52,7 +52,7 @@ export function CalendarHeatmap({
   const [customRange, setCustomRange] = useState<{ from: string; to: string } | null>(null);
   const [rangeError, setRangeError] = useState("");
   const latestDate =
-    allDays.findLast((day) => day.state !== "future")?.date ??
+    allDays.findLast((day) => !(day.future ?? day.state === "future"))?.date ??
     allDays.at(-1)?.date;
   // Inspecting a square changes selection, not the window. Only an external
   // date outside the visible preset needs a new anchor to bring it into view.