Respect the 12h/24h setting in cron schedule descriptions too

The Date & Time setting drove formatDateTime() everywhere, but the
human-readable cron description ("At 08:30 AM every day") came from
cronstrue, a separate library with its own independent AM/PM default
that the setting never touched. Pass its use24HourTimeFormat option
from the same shared setting so "Schedule" columns match the rest of
the app.

Added utils/date.ts's is24HourFormat() getter for this, since
formatDateTime() itself doesn't apply here (cronstrue does its own
cron-to-English rendering, not just time formatting).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

web/src/components/ServerTaskTable.tsx

@@ -1,7 +1,7 @@
 import cronstrue from "cronstrue";
 import { CronExpressionParser } from "cron-parser";
 import type { TaskRecord } from "../api/client";
-import { formatDateTime } from "../utils/date";
+import { formatDateTime, is24HourFormat } from "../utils/date";
 
 export const SCHEDULE_TYPE_LABELS: Record<string, string> = {
   cron: "Cron jobs",
@@ -17,7 +17,7 @@ function describeSchedule(task: TaskRecord): string {
   if (!task.scheduleExpression) return "—";
   if (task.scheduleType === "cron") {
     try {
-      return cronstrue.toString(task.scheduleExpression, { verbose: false });
+      return cronstrue.toString(task.scheduleExpression, { verbose: false, use24HourTimeFormat: is24HourFormat() });
     } catch {
       return task.scheduleExpression;
     }

web/src/utils/date.ts

@@ -12,6 +12,11 @@ export function setDateTimeSettings(settings: DateTimeSettings): void {
   current = settings;
 }
 
+/** Current 12h/24h preference, for formatters outside this file (e.g. cronstrue's use24HourTimeFormat option). */
+export function is24HourFormat(): boolean {
+  return current.timeFormat === "24h";
+}
+
 function pad(n: number): string {
   return String(n).padStart(2, "0");
 }