fix(layout): fit names on phones without sideways scroll

Display and game names shrink to 0.875rem, then end with an ellipsis
(FitText + fit-text utility, CSS container units, full text in title).
Rows and buttons wrap at large fonts, header points chip can shrink.
Guard: scripts/check-overflow.js.

src/pages/AdminUsersPage.jsx

@@ -151,6 +151,11 @@ export default function AdminUsersPage() {
     const confirmDisabled = busy || (pending?.kind === 'delete'
         && typedEmail.trim().toLowerCase() !== pending.user.email.toLowerCase());
 
+    const metaLine = (user) => [user.displayName,
+        t('ADMIN.REGISTERED', {date: formatDateOrNull(user.registrationDate, i18n.language)}),
+        t('ADMIN.LAST_LOGIN', {date: formatDateOrNull(user.lastLoginDate, i18n.language) ?? t('ADMIN.NEVER')}),
+    ].filter(Boolean).join(' · ');
+
     return (
         <PageContainer className="space-y-4 px-4 py-6 md:px-8">
             <Card>
@@ -184,11 +189,8 @@ export default function AdminUsersPage() {
                                 <li key={user.id} className="flex flex-wrap items-center gap-3 py-3">
                                     <div className="min-w-0 flex-1">
                                         <p className="truncate font-medium">{user.email}</p>
-                                        <p className="truncate text-xs text-muted-foreground">
-                                            {[user.displayName,
-                                                t('ADMIN.REGISTERED', {date: formatDateOrNull(user.registrationDate, i18n.language)}),
-                                                t('ADMIN.LAST_LOGIN', {date: formatDateOrNull(user.lastLoginDate, i18n.language) ?? t('ADMIN.NEVER')}),
-                                            ].filter(Boolean).join(' · ')}
+                                        <p className="truncate text-xs text-muted-foreground" title={metaLine(user)}>
+                                            {metaLine(user)}
                                         </p>
                                     </div>
                                     <div className="flex flex-wrap items-center gap-1">