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/foundation/action.ts

@@ -242,6 +242,9 @@ export function handleActionError(error: unknown): ActionFailure {
 	if (error instanceof DatabaseError) {
 		return fail("A database error occurred");
 	}
+	if (error instanceof Error && error.name === "ActionError") {
+		return fail(error.message);
+	}
 	if (error instanceof Error && error.name === "ZodError") {
 		return fail("Validation failed");
 	}