Add registration status badges and auto-dismissing dashboard messages

Two consistency fixes requested after the payment-method work:

1. Registration status (pending/confirmed/partial_paid/paid/cancelled)
   was printed as a raw string on the user dashboard. Added
   RegistrationStatusBadge mirroring the existing EventStatusBadge
   pattern, using the same status colors already established on
   dashboard/admin/registrations.

2. Inline success/error banners across dashboard pages persisted
   indefinitely. Added a shared useDismissingState hook (drop-in
   useState replacement that auto-clears a truthy value after 7s,
   resetting the timer on each update) and swapped it in across ~24
   dashboard files. Excluded: message-only modal dialogs (ticket-
   scanning's success/error confirmations) and two states that mix
   live form-validation feedback with async results inside actively-
   open forms (the registration-edit modal's editError, the event
   create/edit modal's error) - those keep persisting until the user
   acts, since auto-hiding a "fix this field" message mid-edit would
   be a regression. Also fixed at-the-door's existing bespoke
   auto-dismiss timers (10s/15s, one mislabeled as "5s") to the same
   consistent 7s, and removed admin/settings' manual x dismiss button
   in favor of the same auto-only behavior.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

frontend/src/app/dashboard/user/profile/page.tsx

@@ -5,6 +5,7 @@ import { useAuth } from "@/hooks/useAuth";
 import { useRouter } from "next/navigation";
 import { apiFetch } from "@/lib/api";
 import { isValidZAPhone } from "@/lib/phone";
+import { useDismissingState } from "@/hooks/useDismissingState";
 
 export default function UserProfilePage() {
   const { user, token, logout, updateToken } = useAuth();
@@ -19,7 +20,7 @@ export default function UserProfilePage() {
   const [email, setEmail] = useState("");
   const [phone, setPhone] = useState("");
   const [notifPref, setNotifPref] = useState<"email" | "whatsapp" | "both">("email");
-  const [profileMsg, setProfileMsg] = useState<{ type: "ok" | "err"; text: string } | null>(null);
+  const [profileMsg, setProfileMsg] = useDismissingState<{ type: "ok" | "err"; text: string } | null>(null);
   const [savingProfile, setSavingProfile] = useState(false);
 
   const hasValidPhone = isValidZAPhone(phone);
@@ -63,7 +64,7 @@ export default function UserProfilePage() {
   const [currentPassword, setCurrentPassword] = useState("");
   const [newPassword, setNewPassword] = useState("");
   const [confirmPassword, setConfirmPassword] = useState("");
-  const [pwMsg, setPwMsg] = useState<{ type: "ok" | "err"; text: string } | null>(null);
+  const [pwMsg, setPwMsg] = useDismissingState<{ type: "ok" | "err"; text: string } | null>(null);
   const [savingPw, setSavingPw] = useState(false);
 
   const changePassword = async (e: React.FormEvent) => {
@@ -98,7 +99,7 @@ export default function UserProfilePage() {
   };
 
   // ── Revoke sessions ───────────────────────────────────────────────────────
-  const [revokeMsg, setRevokeMsg] = useState<{ type: "ok" | "err"; text: string } | null>(null);
+  const [revokeMsg, setRevokeMsg] = useDismissingState<{ type: "ok" | "err"; text: string } | null>(null);
   const [revoking, setRevoking] = useState(false);
 
   const revokeSessions = async () => {
@@ -126,7 +127,7 @@ export default function UserProfilePage() {
   const [closeStep, setCloseStep] = useState<"idle" | "confirm">("idle");
   const [deleteData, setDeleteData] = useState(false);
   const [closePassword, setClosePassword] = useState("");
-  const [closeMsg, setCloseMsg] = useState<{ type: "ok" | "err"; text: string } | null>(null);
+  const [closeMsg, setCloseMsg] = useDismissingState<{ type: "ok" | "err"; text: string } | null>(null);
   const [closing, setClosing] = useState(false);
 
   const submitAccountClosure = async (e: React.FormEvent) => {