Improve meeting reminders with new scheduler and improved push notifications

Add a new background scheduler to trigger meeting reminders, implement atomic claims for push notifications to prevent duplicates, and add an `ignoreConnected` option to push notifications.

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lib/db/src/schema/executive-meetings.ts

@@ -252,6 +252,11 @@ export const executiveMeetingAlertStateTable = pgTable(
       .references(() => usersTable.id, { onDelete: "cascade" }),
     dismissed: boolean("dismissed").notNull().default(false),
     acknowledged: boolean("acknowledged").notNull().default(false),
+    // #558: Set once by the server-side scheduler the moment a Web
+    // Push reminder has been fired for this (meeting, user) pair, so a
+    // single tick (or any later tick that re-runs the same query) does
+    // not double-ring the iPad. NULL = no push has been sent yet.
+    pushedAt: timestamp("pushed_at", { withTimezone: true }),
     updatedAt: timestamp("updated_at", { withTimezone: true })
       .notNull()
       .defaultNow()