style(panel): unify vertical spacing below PageHeader across pages

panel/src/pages/Account.tsx

@@ -225,7 +225,7 @@ export function Account() {
 
   return (
     <>
-      <PageHeader icon={UserRound} title={t("title")} subtitle={t("subtitle")} className="mb-6" />
+      <PageHeader icon={UserRound} title={t("title")} subtitle={t("subtitle")} />
 
       <Card>
         <CardHeader>

panel/src/pages/Dashboard.tsx

@@ -61,7 +61,7 @@ export function Dashboard() {
 
   return (
     <>
-      <PageHeader icon={LayoutDashboard} title={t("title")} subtitle={t("subtitle")} className="mb-6" />
+      <PageHeader icon={LayoutDashboard} title={t("title")} subtitle={t("subtitle")} />
 
       {loading && !servers ? (
         <Loading />

panel/src/pages/ServerPlayers.tsx

@@ -71,7 +71,6 @@ export function ServerPlayers() {
       title={data.displayName || data.name}
       subtitle={t("players_title")}
       actions={<PhaseBadge phase={phase} />}
-      className="mb-6"
     />
   );
 

panel/src/pages/admin/SubmissionsPage.tsx

@@ -139,7 +139,7 @@ export function SubmissionsPage() {
 
   return (
     <div className="space-y-6">
-      <PageHeader icon={ClipboardCheck} title={t("submissions_title")} subtitle={t("submissions_subtitle")} className="mb-6" />
+      <PageHeader icon={ClipboardCheck} title={t("submissions_title")} subtitle={t("submissions_subtitle")} />
 
       {/* Action Error Alert */}
       {actionError && <MessageLine kind="error" message={actionError} compact />}

panel/src/pages/admin/UpdatesPage.tsx

@@ -164,7 +164,7 @@ export function UpdatesPage() {
 
   return (
     <div className="space-y-6">
-      <PageHeader icon={Clock} title={t("updates_title")} subtitle={t("updates_subtitle")} className="mb-6" />
+      <PageHeader icon={Clock} title={t("updates_title")} subtitle={t("updates_subtitle")} />
 
       {/* Stats Cards Row */}
       <div className="grid grid-cols-1 gap-4 sm:grid-cols-4">

panel/src/pages/admin/UsersPage.tsx

@@ -65,7 +65,7 @@ export function UsersPage() {
 
   return (
     <div className="space-y-6">
-      <PageHeader icon={Users} title={t("users_title")} subtitle={t("users_subtitle")} actions={<CreateUserDialog onCreated={(id) => { reload(); navigate(`/admin/users/${id}`); }} />} className="mb-6" />
+      <PageHeader icon={Users} title={t("users_title")} subtitle={t("users_subtitle")} actions={<CreateUserDialog onCreated={(id) => { reload(); navigate(`/admin/users/${id}`); }} />} />
 
       {/* Filters */}
       <Card>