make an attempt at new notifications using an API (fires always, can't turn off)

src/services/notifications/dualScheduleConfig.ts

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+/**
+ * Builds DualScheduleConfiguration for the Daily Notification plugin.
+ * Used for API-driven "New Activity" notifications (prefetch + notify).
+ */
+
+/**
+ * Convert "HH:mm" (24h) to cron expression "minute hour * * *" (daily at that time).
+ */
+export function timeToCron(timeHHmm: string): string {
+  const [h, m] = timeHHmm.split(":").map(Number);
+  const hour = Math.max(0, Math.min(23, h ?? 0));
+  const minute = Math.max(0, Math.min(59, m ?? 0));
+  return `${minute} ${hour} * * *`;
+}
+
+/**
+ * Cron for 5 minutes before the given "HH:mm" (so prefetch runs before the notification).
+ */
+export function timeToCronFiveMinutesBefore(timeHHmm: string): string {
+  const [h, m] = timeHHmm.split(":").map(Number);
+  let hour = Math.max(0, Math.min(23, h ?? 0));
+  let minute = Math.max(0, Math.min(59, m ?? 0));
+  minute -= 5;
+  if (minute < 0) {
+    minute += 60;
+    hour -= 1;
+    if (hour < 0) hour += 24;
+  }
+  return `${minute} ${hour} * * *`;
+}
+
+export interface DualScheduleConfigInput {
+  /** Time in HH:mm (24h) for the user notification */
+  notifyTime: string;
+  /** Optional title; default "New Activity" */
+  title?: string;
+  /** Optional body; default describes API-driven content */
+  body?: string;
+}
+
+/**
+ * Build plugin DualScheduleConfiguration for scheduleDualNotification().
+ * contentFetch runs 5 minutes before notifyTime; userNotification at notifyTime.
+ */
+export function buildDualScheduleConfig(input: DualScheduleConfigInput): {
+  contentFetch: {
+    enabled: boolean;
+    schedule: string;
+    callbacks: Record<string, unknown>;
+  };
+  userNotification: {
+    enabled: boolean;
+    schedule: string;
+    title: string;
+    body: string;
+    sound: boolean;
+    priority: "high" | "normal" | "low";
+  };
+  relationship?: {
+    autoLink: boolean;
+    contentTimeout: number;
+    fallbackBehavior: "skip" | "show_default" | "retry";
+  };
+} {
+  const notifyTime = input.notifyTime || "09:00";
+  const fetchCron = timeToCronFiveMinutesBefore(notifyTime);
+  const notifyCron = timeToCron(notifyTime);
+  return {
+    contentFetch: {
+      enabled: true,
+      schedule: fetchCron,
+      callbacks: {},
+    },
+    userNotification: {
+      enabled: true,
+      schedule: notifyCron,
+      title: input.title ?? "New Activity",
+      body: input.body ?? "Check your starred projects and offers for updates.",
+      sound: true,
+      priority: "normal",
+    },
+    relationship: {
+      autoLink: true,
+      contentTimeout: 5 * 60 * 1000, // 5 minutes
+      fallbackBehavior: "show_default",
+    },
+  };
+}