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

src/systems/dashboard/dashboardIntegration.js

@@ -347,20 +347,8 @@ function setupDashboardEventListeners(dependencies) {
         });
     }
 
-    // Tracker Settings button (open tracker editor modal)
-    const trackerSettingsBtn = document.querySelector('#rpg-dashboard-tracker-settings');
-    if (trackerSettingsBtn) {
-        trackerSettingsBtn.addEventListener('click', () => {
-            console.log('[RPG Companion] Tracker Settings button clicked');
-            // Trigger the tracker editor button from main UI
-            const trackerEditorBtn = document.getElementById('rpg-open-tracker-editor');
-            if (trackerEditorBtn) {
-                trackerEditorBtn.click();
-            } else {
-                console.warn('[RPG Companion] Tracker editor button not found');
-            }
-        });
-    }
+    // Tracker Settings button now uses ID 'rpg-open-tracker-editor'
+    // Event handler is in trackerEditor.js using jQuery delegation
 
     // Done button (exit edit mode)
     const doneBtn = document.querySelector('#rpg-dashboard-done-edit');