Implement editing users management and permission updates

- Added auto-creation of PlayerUser records from player metadata (user_card_data)
- Fixed player_user table schema (removed player_id, made user_code unique globally)
- Created admin page for managing editing users (view, update names, delete)
- Updated permissions: normal users can now access admin panel, editing users, and leftover media
- Admin-only access: user management, system dependencies, logo customization
- Fixed edited media workflow to preserve original files
- Content.filename now points to edited_media folder, keeping originals intact
- Added user display names in edited media page (shows name if set, code otherwise)
- Fixed leftover media file size calculation (handle None values)
- Split editing users into separate card on admin panel with description

app/blueprints/admin.py

@@ -31,7 +31,6 @@ def admin_required(f):
 
 @admin_bp.route('/')
 @login_required
-@admin_required
 def admin_panel():
     """Display admin panel with system overview."""
     try:
@@ -351,7 +350,6 @@ def system_info():
 
 @admin_bp.route('/leftover-media')
 @login_required
-@admin_required
 def leftover_media():
     """Display leftover media files not assigned to any playlist."""
     from app.models.playlist import playlist_content
@@ -374,12 +372,15 @@ def leftover_media():
         leftover_pdfs = [c for c in leftover_content if c.content_type == 'pdf']
         leftover_pptx = [c for c in leftover_content if c.content_type == 'pptx']
         
-        # Calculate storage
-        total_leftover_size = sum(c.file_size for c in leftover_content)
-        images_size = sum(c.file_size for c in leftover_images)
-        videos_size = sum(c.file_size for c in leftover_videos)
-        pdfs_size = sum(c.file_size for c in leftover_pdfs)
-        pptx_size = sum(c.file_size for c in leftover_pptx)
+        # Calculate storage (handle None values)
+        def safe_file_size(content_list):
+            return sum(c.file_size or 0 for c in content_list)
+        
+        total_leftover_size = safe_file_size(leftover_content)
+        images_size = safe_file_size(leftover_images)
+        videos_size = safe_file_size(leftover_videos)
+        pdfs_size = safe_file_size(leftover_pdfs)
+        pptx_size = safe_file_size(leftover_pptx)
         
         return render_template('admin/leftover_media.html',
                              leftover_images=leftover_images,
@@ -401,7 +402,6 @@ def leftover_media():
 
 @admin_bp.route('/delete-leftover-images', methods=['POST'])
 @login_required
-@admin_required
 def delete_leftover_images():
     """Delete all leftover images that are not part of any playlist"""
     from app.models.playlist import playlist_content
@@ -457,7 +457,6 @@ def delete_leftover_images():
 
 @admin_bp.route('/delete-leftover-videos', methods=['POST'])
 @login_required
-@admin_required
 def delete_leftover_videos():
     """Delete all leftover videos that are not part of any playlist"""
     from app.models.playlist import playlist_content
@@ -513,7 +512,6 @@ def delete_leftover_videos():
 
 @admin_bp.route('/delete-single-leftover/<int:content_id>', methods=['POST'])
 @login_required
-@admin_required
 def delete_single_leftover(content_id):
     """Delete a single leftover content file"""
     try:
@@ -776,7 +774,6 @@ def upload_login_logo():
 
 @admin_bp.route('/editing-users')
 @login_required
-@admin_required
 def manage_editing_users():
     """Display and manage users that edit images on players."""
     try:
@@ -803,7 +800,6 @@ def manage_editing_users():
 
 @admin_bp.route('/editing-users/<int:user_id>/update', methods=['POST'])
 @login_required
-@admin_required
 def update_editing_user(user_id: int):
     """Update editing user name."""
     try:
@@ -828,7 +824,6 @@ def update_editing_user(user_id: int):
 
 @admin_bp.route('/editing-users/<int:user_id>/delete', methods=['POST'])
 @login_required
-@admin_required
 def delete_editing_user(user_id: int):
     """Delete editing user."""
     try: