fix: recompute all cron next-run times after job update (openclaw#15905) thanks @echoVic

Verified:
- pnpm check
- pnpm vitest src/cron/service.issue-regressions.test.ts src/cron/service.issue-13992-regression.test.ts

Co-authored-by: echoVic <16428813+echoVic@users.noreply.github.com>
Co-authored-by: Tak Hoffman <781889+Takhoffman@users.noreply.github.com>

src/cron/service/ops.ts

@@ -119,7 +119,7 @@ export async function add(state: CronServiceState, input: CronJobCreate) {
 export async function update(state: CronServiceState, id: string, patch: CronJobPatch) {
   return await locked(state, async () => {
     warnIfDisabled(state, "update");
-    await ensureLoaded(state);
+    await ensureLoaded(state, { skipRecompute: true });
     const job = findJobOrThrow(state, id);
     const now = state.deps.nowMs();
     applyJobPatch(job, patch);
@@ -150,6 +150,13 @@ export async function update(state: CronServiceState, id: string, patch: CronJob
         job.state.nextRunAtMs = undefined;
         job.state.runningAtMs = undefined;
       }
+    } else if (job.enabled) {
+      // Non-schedule edits should not mutate other jobs, but still repair a
+      // missing/corrupt nextRunAtMs for the updated job.
+      const nextRun = job.state.nextRunAtMs;
+      if (typeof nextRun !== "number" || !Number.isFinite(nextRun)) {
+        job.state.nextRunAtMs = computeJobNextRunAtMs(job, now);
+      }
     }
 
     await persist(state);