refactor: remove redundant Edit Trackers button from hamburger menu

Remove duplicate "Edit Trackers" button from hamburger menu since there's
already a Tracker Settings button in the dashboard header.

Changes:
- Removed "Edit Trackers" button from template.html hamburger menu
- Updated Settings button to full width (removed .rpg-btn-half class)
- Changed dashboard button ID from 'rpg-dashboard-tracker-settings' to
  'rpg-open-tracker-editor' to become the canonical button
- Removed redundant event handler in dashboardIntegration.js that was
  clicking the old hamburger button

Benefits:
- Reduces UI clutter in hamburger menu
- Single source of truth for Tracker Settings button (dashboard header)
- Existing code in trackerEditor.js, infoBoxWidgets.js continues to work
  via jQuery event delegation on ID 'rpg-open-tracker-editor'

Technical Notes:
- jQuery delegation $(document).on('click', '#rpg-open-tracker-editor', ...)
  works for any element with that ID, not just a specific one
- No changes needed to trackerEditor.js or widget disabled state handlers
- Dashboard button is now the canonical "Edit Trackers" trigger

Related: Hamburger menu UI, dashboard header controls

template.html

@@ -64,12 +64,9 @@
                 <i class="fa-solid fa-sync"></i> Refresh RPG Info
             </button>
 
-            <!-- Settings and Edit Trackers Buttons Row -->
+            <!-- Settings Button -->
             <div class="rpg-settings-buttons-row">
-                <button id="rpg-open-tracker-editor" class="rpg-btn-settings rpg-btn-half">
-                    <i class="fa-solid fa-sliders"></i> Edit Trackers
-                </button>
-                <button id="rpg-open-settings" class="rpg-btn-settings rpg-btn-half">
+                <button id="rpg-open-settings" class="rpg-btn-settings">
                     <i class="fa-solid fa-gear"></i> Settings
                 </button>
             </div>