Add customizable prompts editor and reorganize settings panel

- Reorganized settings: moved Auto-update, Narrator Mode, and Debug Mode to Advanced section
- Added Customize Prompts button with comprehensive prompts editor modal
- Implemented 7 customizable AI prompts: HTML, plot progression (random/natural), avatar generation, tracker instructions, tracker continuation, and combat narrative
- Added individual and bulk restore to defaults functionality
- Integrated custom prompts across generation modules (plotProgression, promptBuilder, encounterPrompts)
- Auto-update toggle now disabled when not in Separate generation mode
- Merged XML/Markdown tracker instructions into unified prompt

src/systems/ui/layout.js

@@ -336,15 +336,24 @@ export function updateGenerationModeUI() {
         $('#rpg-manual-update').hide();
         $('#rpg-external-api-settings').slideUp(200);
         $('#rpg-separate-mode-settings').slideUp(200);
+        // Disable auto-update toggle (not applicable in together mode)
+        $('#rpg-toggle-auto-update').prop('disabled', true);
+        $('#rpg-auto-update-container').css('opacity', '0.5');
     } else if (extensionSettings.generationMode === 'separate') {
         // In "separate" mode, manual update button is visible
         $('#rpg-manual-update').show();
         $('#rpg-external-api-settings').slideUp(200);
         $('#rpg-separate-mode-settings').slideDown(200);
+        // Enable auto-update toggle (only works in separate mode)
+        $('#rpg-toggle-auto-update').prop('disabled', false);
+        $('#rpg-auto-update-container').css('opacity', '1');
     } else if (extensionSettings.generationMode === 'external') {
         // In "external" mode, manual update button is visible AND external settings are shown
         $('#rpg-manual-update').show();
         $('#rpg-external-api-settings').slideDown(200);
         $('#rpg-separate-mode-settings').slideUp(200);
+        // Disable auto-update toggle (not applicable in external mode)
+        $('#rpg-toggle-auto-update').prop('disabled', true);
+        $('#rpg-auto-update-container').css('opacity', '0.5');
     }
 }