feat(frontend): add page titles to navbar on mobile

- Save vertical space on mobile by showing page title in navbar
- Mobile: "spotlight.cam - {PageTitle}" instead of separate h1
- Desktop: unchanged - page titles remain as separate headings
- Saves ~60-80px vertical space on mobile devices

Pages updated:
- Dashboard, Events, Matches, History, Profile

frontend/src/pages/DashboardPage.jsx

@@ -160,9 +160,9 @@ const DashboardPage = () => {
   const hasOutgoing = matchRequests?.outgoing?.length > 0;
 
   return (
-    <Layout>
+    <Layout pageTitle="Dashboard">
       <div className="max-w-5xl mx-auto">
-        <div className="mb-8">
+        <div className="hidden lg:block mb-8">
           <h1 className="text-3xl font-bold text-gray-900">Dashboard</h1>
           <p className="text-gray-600 mt-1">
             Welcome back, {user?.firstName || user?.username}!

frontend/src/pages/EventsPage.jsx

@@ -192,10 +192,10 @@ const EventsPage = () => {
   };
 
   return (
-    <Layout>
+    <Layout pageTitle="Events">
       <div className="max-w-4xl mx-auto">
-        <h1 className="text-3xl font-bold text-gray-900 mb-2">Choose an event</h1>
-        <p className="text-gray-600 mb-8">Join an event and start connecting with other dancers</p>
+        <h1 className="hidden lg:block text-3xl font-bold text-gray-900 mb-2">Choose an event</h1>
+        <p className="hidden lg:block text-gray-600 mb-8">Join an event and start connecting with other dancers</p>
 
         {canLoadMorePast && (
           <div className="mb-4 flex justify-center">

frontend/src/pages/HistoryPage.jsx

@@ -5,10 +5,10 @@ import { MATCH_STATUS } from '../constants';
 
 const HistoryPage = () => {
   return (
-    <Layout>
+    <Layout pageTitle="History">
       <div className="max-w-4xl mx-auto">
-        <h1 className="text-3xl font-bold text-gray-900 mb-2">Collaboration history</h1>
-        <p className="text-gray-600 mb-8">Your previous matches and ratings</p>
+        <h1 className="hidden lg:block text-3xl font-bold text-gray-900 mb-2">Collaboration history</h1>
+        <p className="hidden lg:block text-gray-600 mb-8">Your previous matches and ratings</p>
 
         {/* Matches Section */}
         <div className="mb-12">

frontend/src/pages/MatchesPage.jsx

@@ -125,9 +125,9 @@ const MatchesPage = () => {
   const otherMatches = filteredMatches.filter(m => !(m.status === MATCH_STATUS.PENDING && !m.isInitiator));
 
   return (
-    <Layout noPadding>
+    <Layout noPadding pageTitle="Matches">
       <div className="w-full max-w-4xl mx-auto px-4 sm:px-6 lg:px-8 py-8">
-        <div className="mb-6">
+        <div className="hidden lg:block mb-6">
           <h1 className="text-3xl font-bold text-gray-900">Match Requests</h1>
           <p className="text-gray-600 mt-2">
             Manage your dance partner connections

frontend/src/pages/ProfilePage.jsx

@@ -10,7 +10,7 @@ const ProfilePage = () => {
   const [activeTab, setActiveTab] = useState('profile');
 
   return (
-    <Layout>
+    <Layout pageTitle="Profile">
       <div className="min-h-screen bg-gray-50 py-8">
         <div className="max-w-4xl mx-auto px-4">
           {/* Header */}