feat: public events/polls, friends graph, captcha, SSE hardening, and admin UX

Ship product gaps: register/vote pages, friend add/accept/decline/remove, email verify TTL, captcha on login/forgot, soft-fail user actions, SSE abort/shared client, Commando Centrum error toasts, admin delete for events/polls, and IT/NL i18n fills.

Co-authored-by: Cursor <[email protected]>

src/lib/validators/event.ts

@@ -67,8 +67,13 @@ export const eventWinnerSchema = z.object({
 	position: z.coerce.number().int().positive().default(1),
 });
 
+export const registerForEventSchema = z.object({
+	eventId: z.coerce.number().int().positive(),
+});
+
 export type EventTypeInput = z.infer<typeof eventTypeSchema>;
 export type CreateEventInput = z.infer<typeof createEventSchema>;
 export type UpdateEventInput = z.infer<typeof updateEventSchema>;
 export type EventPrizeInput = z.infer<typeof eventPrizeSchema>;
 export type EventWinnerInput = z.infer<typeof eventWinnerSchema>;
+export type RegisterForEventInput = z.infer<typeof registerForEventSchema>;