Add edit feature enable/disable setting

- Added checkbox in Settings screen to enable/disable edit feature
- Setting stored in app_config.json as 'edit_feature_enabled'
- Edit workflow now validates: player setting, media type, server permission, card auth
- Shows appropriate error message when edit is blocked at any validation step
- Defaults to enabled (true) if not set
- All conditions must be met for edit interface to open

src/main.py

@@ -1078,6 +1078,7 @@ class SettingsPopup(Popup):
         self.ids.orientation_input.text = self.player.config.get('orientation', 'Landscape')
         self.ids.touch_input.text = self.player.config.get('touch', 'True')
         self.ids.resolution_input.text = self.player.config.get('max_resolution', 'auto')
+        self.ids.edit_enabled_checkbox.active = self.player.config.get('edit_feature_enabled', True)
         
         # Update status info
         self.ids.playlist_info.text = f'Playlist Version: {self.player.playlist_version}'
@@ -1118,6 +1119,12 @@ class SettingsPopup(Popup):
             Window.remove_widget(self.keyboard_widget)
             self.keyboard_widget = None
     
+    def on_edit_feature_toggle(self, is_active):
+        """Handle edit feature checkbox toggle"""
+        Logger.info(f"SettingsPopup: Edit feature {'enabled' if is_active else 'disabled'}")
+        # Update config immediately so it's available
+        self.player.config['edit_feature_enabled'] = is_active
+    
     def on_popup_dismiss(self, *args):
         """Handle popup dismissal - resume playback and restart cursor hide timer"""
         # Hide and remove keyboard
@@ -1224,6 +1231,7 @@ class SettingsPopup(Popup):
         self.player.config['orientation'] = self.ids.orientation_input.text
         self.player.config['touch'] = self.ids.touch_input.text
         self.player.config['max_resolution'] = self.ids.resolution_input.text
+        self.player.config['edit_feature_enabled'] = self.ids.edit_enabled_checkbox.active
         
         # Save to file
         self.player.save_config()
@@ -1838,12 +1846,23 @@ class SignagePlayer(Widget):
         Show edit interface for current image
         
         Workflow:
-        1. Validate media type (must be image)
-        2. Check edit_on_player permission from server
-        3. Prompt for card swipe (5 second timeout)
-        4. Open edit interface with card data stored
-        5. When saved, card data is included in metadata and sent to server
+        1. Check if edit feature is enabled in settings
+        2. Validate media type (must be image)
+        3. Check edit_on_player permission from server
+        4. Prompt for card swipe (5 second timeout)
+        5. Open edit interface with card data stored
+        6. When saved, card data is included in metadata and sent to server
         """
+        # Check 0: Verify edit feature is enabled in player settings
+        edit_feature_enabled = self.config.get('edit_feature_enabled', True)
+        if not edit_feature_enabled:
+            Logger.warning("SignagePlayer: Edit feature is disabled in settings")
+            # Show error message briefly
+            self.ids.status_label.text = 'Edit feature disabled - Enable in settings'
+            self.ids.status_label.opacity = 1
+            Clock.schedule_once(lambda dt: setattr(self.ids.status_label, 'opacity', 0), 2)
+            return
+        
         # Check if current media is an image
         if not self.playlist or self.current_index >= len(self.playlist):
             Logger.warning("SignagePlayer: No media to edit")