feat: «Recordármelo», a reminder of a ticket only for me

On a ticket, «Recordármelo» offers in an hour, this evening, tomorrow or
next Monday at 9, in a week, or any date and time, with an optional note.
The ticket shows the waiting one («Te lo recordaré el mié 21 a las 9:00»)
to change or drop. Every minute a scheduler tells the ones whose time
came as a REMINDER notification (bell, push, e-mail), once, and forgets
those whose ticket went to the trash or out of reach. One per person and
ticket, private, no history (Mongo `issue_reminders`).

API: setReminder / clearReminder, Issue.myReminder, myReminders;
PUT/DELETE /api/issues/{issue}/reminder, GET /api/me/reminders. MCP:
remind_me.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

libs/web/tracker/application/src/lib/events/issue.events.ts

@@ -50,6 +50,12 @@ export const issuePageEvents = eventGroup({
     watchRequested: type<{ issueId: string; watching: boolean }>(),
     pinRequested: type<{ issueId: string; pinned: boolean }>(),
     followTreeRequested: type<{ issueId: string; on: boolean }>(),
+    reminderRequested: type<{
+      issueId: string;
+      /** null: drop it. */
+      at: string | null;
+      note: string | null;
+    }>(),
     trashRequested: type<{
       issueId: string;
       trashed: boolean;