feat: redesign gallery page with grid layout and enhance ownership checks

- Changed gallery from carousel to responsive grid layout (similar to about page)
- Shows album cover images with titles, creator info, and photo count
- Improved visual design with hover effects and better spacing
- Edit buttons now only visible to album owners (uses current_user_id variable)
- Added proper ownership verification in all album edit/delete operations
- Enhanced styling for mobile/tablet/desktop responsiveness
- Simplified layout makes it easier to browse multiple albums at once

src/pages/gallery/view_album.php

@@ -82,7 +82,7 @@ $conn->close();
     .album-header {
         background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
         color: white;
-        padding: 40px 0;
+        padding: 20px 20px;
         margin-bottom: 40px;
         border-radius: 10px;
     }
@@ -268,7 +268,7 @@ require_once($rootPath . '/components/banner.php');
                 </a>
 
                 <div class="album-header">
-                    <div class="album-header-content">
+                    <div class="album-header-content px-2">
                         <div style="flex: 1;">
                             <h2 style="margin: 0; margin-bottom: 10px;"><?php echo htmlspecialchars($album['title']); ?></h2>
                             <?php if ($album['description']): ?>