feat: Add Exit Edit Mode button visibility toggle and tab management UI

Fix Exit Edit Mode button:
- Move button before Lock button (left side as requested)
- Add visibility toggle in editModeManager.js
  - Show done button when entering edit mode
  - Hide done button when exiting edit mode
- Fixes critical bug where button stayed hidden permanently

Add tab management UI:
- Create promptDialog.js for text input modals (rename, create)
- Create tabContextMenu.js with right-click context menu on tabs
- Integrate with TabManager API for all operations:
  - Add New Tab (with validation)
  - Rename Tab (with validation)
  - Change Icon (icon picker with 20 common icons)
  - Duplicate Tab (copies widgets)
  - Delete Tab (with confirmation, blocks if last tab)
- Auto-save after tab operations
- Event delegation for dynamic tab elements

Files changed:
- dashboardTemplate.html: Move done button to correct position
- editModeManager.js: Add visibility toggles in enter/exit methods
- promptDialog.js: New dialog system for text input
- tabContextMenu.js: New context menu system
- dashboardIntegration.js: Initialize tab context menu

src/systems/dashboard/dashboardIntegration.js

@@ -14,6 +14,7 @@ import { WidgetRegistry } from './widgetRegistry.js';
 import { generateDefaultDashboard } from './defaultLayout.js';
 import { TabScrollManager } from './tabScrollManager.js';
 import { HeaderOverflowManager } from './headerOverflowManager.js';
+import { TabContextMenu } from './tabContextMenu.js';
 import { showConfirmDialog } from './confirmDialog.js';
 
 // Widget imports
@@ -31,6 +32,7 @@ import { registerQuestsWidget } from './widgets/questsWidget.js';
 let dashboardManager = null;
 let tabScrollManager = null;
 let headerOverflowManager = null;
+let tabContextMenu = null;
 
 /**
  * Get the dashboard manager instance
@@ -123,6 +125,23 @@ export async function initializeDashboard(dependencies) {
             tabScrollManager.init();
         }
 
+        // Initialize tab context menu
+        if (tabsContainer && dashboardManager?.tabManager) {
+            tabContextMenu = new TabContextMenu({
+                tabManager: dashboardManager.tabManager,
+                onTabChange: (event, data) => {
+                    console.log('[RPG Companion] Tab context menu event:', event, data);
+                    // Re-render tabs after tab operations
+                    dashboardManager.renderTabs();
+                    // Save dashboard state
+                    if (dashboardManager.autoSave) {
+                        saveSettings();
+                    }
+                }
+            });
+            tabContextMenu.init(tabsContainer);
+        }
+
         // Initialize header overflow manager
         const headerRight = document.querySelector('#rpg-dashboard-header-right');
         if (headerRight) {