fix: add debug mode toggle to settings panel

Add debug mode checkbox to RPG Companion Settings popup (Display Options section).
Users can enable debug mode to show the mobile-friendly debug panel with parser logs.

This was missing from the previous commit.

template.html

@@ -198,7 +198,7 @@
 
                 <label class="checkbox_label">
                     <input type="checkbox" id="rpg-toggle-debug-mode" />
-                    <span>🔍 Enable Debug Mode (Mobile-Friendly)</span>
+                    <span>Enable Debug Mode</span>
                 </label>
                 <small style="display: block; margin-left: 24px; margin-top: -8px; color: #888; font-size: 11px;">
                     Shows parser logs in a mobile-friendly UI panel. Useful for troubleshooting. Look for the red bug button.