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/admin/settings/page.tsx

@@ -5,6 +5,7 @@ import { useAuth } from "@/hooks/useAuth";
 import { useRouter } from "next/navigation";
 import { apiFetch, API_BASE, resolveToApiOrigin } from "@/lib/api";
 import { useSiteSettings } from "@/contexts/SiteSettingsContext";
+import { useDismissingState } from "@/hooks/useDismissingState";
 
 type TabId = "organisation" | "branding" | "notifications" | "email" | "legal";
 
@@ -36,19 +37,17 @@ function Field({
 }
 
 function SaveBar({
-  saving, onSave, result, onDismiss,
+  saving, onSave, result,
 }: {
   saving: boolean;
   onSave: () => void;
   result: { ok: boolean; message: string } | null;
-  onDismiss: () => void;
 }) {
   return (
     <div className="flex items-center justify-between pt-4 border-t mt-6 flex-wrap gap-3">
       {result ? (
         <span className={`text-sm flex items-center gap-1.5 ${result.ok ? "text-green-600" : "text-red-600"}`}>
           {result.ok ? "✓" : "✗"} {result.message}
-          <button type="button" onClick={onDismiss} className="ml-1 text-gray-400 hover:text-gray-600 text-xs">×</button>
         </span>
       ) : (
         <span />
@@ -75,7 +74,7 @@ export default function SiteSettingsPage() {
 
   // Per-tab save state
   const [saving, setSaving] = useState(false);
-  const [result, setResult] = useState<{ ok: boolean; message: string } | null>(null);
+  const [result, setResult] = useDismissingState<{ ok: boolean; message: string } | null>(null);
 
   // ── Organisation ──
   const [orgName, setOrgName] = useState("");
@@ -104,7 +103,7 @@ export default function SiteSettingsPage() {
   const [smtpPass, setSmtpPass] = useState("");
   const [smtpPassSet, setSmtpPassSet] = useState(false);
   const [smtpTesting, setSmtpTesting] = useState(false);
-  const [smtpTestResult, setSmtpTestResult] = useState<{ ok: boolean; message: string; raw?: string } | null>(null);
+  const [smtpTestResult, setSmtpTestResult] = useDismissingState<{ ok: boolean; message: string; raw?: string } | null>(null);
 
   // ── Legal ──
   const [legalOperatorName, setLegalOperatorName] = useState("");
@@ -332,7 +331,7 @@ export default function SiteSettingsPage() {
             <input className={inputCls} placeholder="https://events.yourchurch.org"
               value={appBaseUrl} onChange={e => setAppBaseUrl(e.target.value)} />
           </Field>
-          <SaveBar saving={saving} onSave={saveOrganisation} result={result} onDismiss={() => setResult(null)} />
+          <SaveBar saving={saving} onSave={saveOrganisation} result={result} />
         </div>
       )}
 
@@ -371,7 +370,7 @@ export default function SiteSettingsPage() {
             }} className="text-sm" />
           </Field>
 
-          <SaveBar saving={saving} onSave={saveBranding} result={result} onDismiss={() => setResult(null)} />
+          <SaveBar saving={saving} onSave={saveBranding} result={result} />
         </div>
       )}
 
@@ -385,7 +384,7 @@ export default function SiteSettingsPage() {
             <input className={inputCls} placeholder="registrations@yourchurch.org, admin@yourchurch.org"
               value={notifEmails} onChange={e => setNotifEmails(e.target.value)} />
           </Field>
-          <SaveBar saving={saving} onSave={saveNotifications} result={result} onDismiss={() => setResult(null)} />
+          <SaveBar saving={saving} onSave={saveNotifications} result={result} />
         </div>
       )}
 
@@ -464,7 +463,7 @@ export default function SiteSettingsPage() {
             )}
           </div>
 
-          <SaveBar saving={saving} onSave={saveSmtp} result={result} onDismiss={() => setResult(null)} />
+          <SaveBar saving={saving} onSave={saveSmtp} result={result} />
         </div>
       )}
 
@@ -503,7 +502,7 @@ export default function SiteSettingsPage() {
             </div>
           </div>
 
-          <SaveBar saving={saving} onSave={saveLegal} result={result} onDismiss={() => setResult(null)} />
+          <SaveBar saving={saving} onSave={saveLegal} result={result} />
         </div>
       )}
     </div>