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diff --git a/‎APPGAP_MAPPING.md‎
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diff --git a/‎README.md‎
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diff --git a/‎assets/a2ui/widgets/device_count.json‎
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@@ -1,148 +1,148 @@
-# AppGap 對照表 (AppGap Mapping Reference)
+# AppGap Mapping Reference
 
-## 基本對照表 (Basic Mapping)
+## Basic Mapping
 
-| privacygui_widgets | ui_kit_library | 像素值 (Pixels) | 使用場景 (Usage) |
+| privacygui_widgets | ui_kit_library | Pixels | Usage |
 |-------------------|----------------|----------------|------------------|
-| `AppGap.small()`  | `AppGap.xs()`  | 4px           | 最小間距 (Minimal spacing) |
-| `AppGap.small2()` | `AppGap.sm()`  | 8px           | 小間距 (Small spacing) |
-| `AppGap.small3()` | `AppGap.md()`  | 12px          | 預設間距 (Default spacing) |
-| `AppGap.medium()` | `AppGap.lg()`  | 16px          | 中等間距 (Medium spacing) |
-| `AppGap.large()`  | `AppGap.xl()`  | 20px          | 大間距 (Large spacing) |
-| `AppGap.large2()` | `AppGap.xxl()` | 24px          | 特大間距 (Extra large spacing) |
-| `AppGap.large3()` | `AppGap.xxxl()` | 32px         | 最大間距 (Maximum spacing) |
-| `AppGap.gutter()` | `AppGap.gutter()` | 16px       | 版面溝槽 (Layout gutter) |
+| `AppGap.small()`  | `AppGap.xs()`  | 4px           | Minimal spacing |
+| `AppGap.small2()` | `AppGap.sm()`  | 8px           | Small spacing |
+| `AppGap.small3()` | `AppGap.md()`  | 12px          | Default spacing |
+| `AppGap.medium()` | `AppGap.lg()`  | 16px          | Medium spacing |
+| `AppGap.large()`  | `AppGap.xl()`  | 20px          | Large spacing |
+| `AppGap.large2()` | `AppGap.xxl()` | 24px          | Extra large spacing |
+| `AppGap.large3()` | `AppGap.xxxl()` | 32px         | Maximum spacing |
+| `AppGap.gutter()` | `AppGap.gutter()` | 16px       | Layout gutter |
 
-## 常見使用場景建議 (Common Usage Recommendations)
+## Common Usage Recommendations
 
-### 表單間距 (Form Spacing)
-- **表單欄位間距**: `AppGap.md()` (12px) - 表單欄位之間
-- **表單區塊間距**: `AppGap.lg()` (16px) - 表單區塊之間
-- **標籤與輸入框**: `AppGap.xs()` (4px) - 標籤與輸入框之間
+### Form Spacing
+- **Form field spacing**: `AppGap.md()` (12px) - Between form fields
+- **Form section spacing**: `AppGap.lg()` (16px) - Between form sections
+- **Label and Input**: `AppGap.xs()` (4px) - Between label and input box
 
-### 卡片間距 (Card Spacing)
-- **卡片內部間距**: `AppGap.lg()` (16px) - 卡片內容間距
-- **卡片外部邊距**: `AppGap.sm()` (8px) - 卡片之間的間距
+### Card Spacing
+- **Internal card spacing**: `AppGap.lg()` (16px) - Padding within cards
+- **External card margin**: `AppGap.sm()` (8px) - Spacing between cards
 
-### 按鈕間距 (Button Spacing)
-- **按鈕群組間距**: `AppGap.sm()` (8px) - 按鈕群組內按鈕間距
-- **按鈕區塊間距**: `AppGap.lg()` (16px) - 按鈕區塊之間
+### Button Spacing
+- **Button group spacing**: `AppGap.sm()` (8px) - Spacing between buttons in a group
+- **Button block spacing**: `AppGap.lg()` (16px) - Between button blocks
 
-### 版面間距 (Layout Spacing)
-- **頁面區塊間距**: `AppGap.xl()` (20px) - 主要頁面區塊間
-- **清單項目間距**: `AppGap.sm()` (8px) - 清單項目之間
-- **主要標題間距**: `AppGap.xxxl()` (32px) - 重要標題區塊
+### Layout Spacing
+- **Page section spacing**: `AppGap.xl()` (20px) - Between major page sections
+- **List item spacing**: `AppGap.sm()` (8px) - Between list items
+- **Main heading spacing**: `AppGap.xxxl()` (32px) - For important heading sections
 
-### 元件間距 (Component Spacing)
-- **圖標文字間距**: `AppGap.xs()` (4px) - 圖標與文字之間
-- **開關元件間距**: `AppGap.sm()` (8px) - 開關與標籤之間
+### Component Spacing
+- **Icon and Text spacing**: `AppGap.xs()` (4px) - Between icon and text
+- **Toggle component spacing**: `AppGap.sm()` (8px) - Between toggle and label
 
-## 解決命名衝突 (Resolving Naming Conflicts)
+## Resolving Naming Conflicts
 
-當同時導入兩個庫時，使用 `hide` 來避免衝突：
+When importing both libraries at the same time, use `hide` to avoid conflicts:
 
 ```dart
-// 隱藏 ui_kit_library 的 AppGap
+// Hide AppGap from ui_kit_library
 import 'package:ui_kit_library/ui_kit.dart' hide AppGap;
 import 'package:privacygui_widgets/widgets/gap/gap.dart';
 
-// 或者隱藏 privacygui_widgets 的 AppGap
+// Or hide AppGap from privacygui_widgets
 import 'package:privacygui_widgets/widgets/_widgets.dart' hide AppGap;
 import 'package:ui_kit_library/ui_kit.dart';
 ```
 
-## 使用映射工具 (Using Mapping Utilities)
+## Using Mapping Utilities
 
 ```dart
 import 'package:privacy_gui/util/appgap_mapping.dart';
 
-// 取得對應間距
-Widget gap = AppGapMapper.getUiKitGap('medium'); // 返回 AppGap.lg()
-Widget gap2 = AppGapMapper.getPrivacyGap('lg');  // 返回 AppGap.medium()
+// Get corresponding gap
+Widget gap = AppGapMapper.getUiKitGap('medium'); // Returns AppGap.lg()
+Widget gap2 = AppGapMapper.getPrivacyGap('lg');  // Returns AppGap.medium()
 
-// 使用擴展方法
+// Use extension methods
 Widget gap3 = 'medium'.toGap(useUiKit: true);   // ui_kit AppGap.lg()
 double pixels = 'medium'.gapPixels;              // 16.0
 
-// 轉換間距系統
+// Convert gap systems
 String uiKitSize = 'medium'.toUiKitGap();       // 'lg'
 String privacySize = 'lg'.toPrivacyGap();        // 'medium'
 ```
 
-## 遷移指南 (Migration Guide)
+## Migration Guide
 
-### 步驟 1：識別現有用法
+### Step 1: Identify existing usage
 ```dart
-// 舊代碼 (privacygui_widgets)
+// Old code (privacygui_widgets)
 const AppGap.small2(),
 const AppGap.medium(),
 const AppGap.large3(),
 ```
 
-### 步驟 2：轉換到新格式
+### Step 2: Convert to new format
 ```dart
-// 新代碼 (ui_kit_library)
-AppGap.sm(),    // 替代 AppGap.small2()
-AppGap.lg(),    // 替代 AppGap.medium()
-AppGap.xxxl(),  // 替代 AppGap.large3()
+// New code (ui_kit_library)
+AppGap.sm(),    // Alternative to AppGap.small2()
+AppGap.lg(),    // Alternative to AppGap.medium()
+AppGap.xxxl(),  // Alternative to AppGap.large3()
 ```
 
-### 步驟 3：更新導入語句
+### Step 3: Update import statements
 ```dart
-// 添加 hide 子句避免衝突
+// Add hide clauses to avoid conflicts
 import 'package:ui_kit_library/ui_kit.dart' hide AppGap, AppText;
 import 'package:privacygui_widgets/widgets/gap/gap.dart';
 import 'package:privacygui_widgets/widgets/text/app_text.dart';
 ```
 
-## 常見錯誤與解決方案 (Common Issues & Solutions)
+## Common Issues & Solutions
 
-### 錯誤 1: `prefix_shadowed_by_local_declaration`
+### Issue 1: `prefix_shadowed_by_local_declaration`
 ```dart
-// 問題: AppGap 被本地聲明遮蔽
+// Problem: AppGap is shadowed by a local declaration
 error - The prefix 'AppGap' can't be used here because it's shadowed by a local declaration.
 
-// 解決方案: 使用 hide 隱藏衝突的名稱
+// Solution: Use hide to hide conflicting names
 import 'package:ui_kit_library/ui_kit.dart' hide AppGap;
 ```
 
-### 錯誤 2: `ambiguous_import`
+### Issue 2: `ambiguous_import`
 ```dart
-// 問題: 兩個庫都定義了相同名稱
+// Problem: Both libraries define the same name
 error - The name 'AppGap' is defined in multiple libraries.
 
-// 解決方案: 使用別名或隱藏
+// Solution: Use aliases or hide
 import 'package:ui_kit_library/ui_kit.dart' as UiKit;
 import 'package:privacygui_widgets/widgets/gap/gap.dart' as PrivacyGap;
 ```
 
-### 錯誤 3: 屬性名稱不匹配
+### Issue 3: Property name mismatch
 ```dart
-// ui_kit_library 使用簡化名稱
-AppGap.sm()    // ✓ 正確
-AppGap.small2() // ✗ 錯誤 - 這是 privacygui_widgets 語法
+// ui_kit_library uses simplified names
+AppGap.sm()    // ✓ Correct
+AppGap.small2() // ✗ Incorrect - This is privacygui_widgets syntax
 ```
 
-## 最佳實踐 (Best Practices)
+## Best Practices
 
-1. **保持一致性**: 在單一檔案中使用同一套間距系統
-2. **使用語意化名稱**: 優先使用 `AppGapMapper.getRecommendedSpacing('form_field')`
-3. **避免硬編碼**: 使用預定義的間距值而非自定義像素
-4. **測試響應式**: 確保間距在不同螢幕尺寸下正常顯示
+1. **Maintain Consistency**: Use a single gap system within a single file.
+2. **Use Semantic Names**: Prefer `AppGapMapper.getRecommendedSpacing('form_field')`.
+3. **Avoid Hard-coding**: Use predefined gap values instead of custom pixels.
+4. **Test Responsiveness**: Ensure spacing displays correctly across different screen sizes.
 
-## 工具類使用範例 (Utility Examples)
+## Utility Examples
 
 ```dart
-// 取得所有可用間距
+// Get all available gap sizes
 Map<String, double> gaps = AppGapMapper.getAllGapSizes();
 
-// 驗證間距大小
+// Validate gap size
 bool isValid = AppGapMapper.isValidGapSize('medium'); // true
 
-// 取得建議間距
+// Get recommended spacing
 Widget spacing = AppGapMapper.getRecommendedSpacing('form_field');
 
-// 使用常數
+// Use constants
 Widget box = AppGapConstants.lgBox;  // SizedBox(height: 16, width: 16)
 Widget vertical = AppGapConstants.lgVertical;  // SizedBox(height: 16)
 ```
@@ -115,8 +115,13 @@ To run tests that are specifically tagged for UI widgets (and are not screenshot
 
 ```bash
 flutter test --tags ui
+
 ```
 
+## ♿ Accessibility (WCAG)
+
+PrivacyGUI adheres to WCAG 2.1 Level AA standards. For detailed documentation on accessibility testing, integration, and compliance analysis, please refer to the **[Accessibility Documentation](doc/accessibility/README.md)**.
+
 ## Contributing
 
 Please follow the existing code style and conventions. Ensure that any new feature or bug fix is accompanied by relevant tests.
@@ -0,0 +1,73 @@
+{
+    "widgetId": "a2ui_device_count",
+    "displayName": "Connected Devices",
+    "description": "Shows the number of connected devices with navigation to device list",
+    "constraints": {
+        "minColumns": 2,
+        "maxColumns": 4,
+        "preferredColumns": 3,
+        "minRows": 2,
+        "maxRows": 3,
+        "preferredRows": 2
+    },
+    "template": {
+        "type": "Card",
+        "properties": {
+            "padding": 16.0,
+            "onTap": {
+                "$action": "navigation.push",
+                "params": {
+                    "route": "menuInstantDevices"
+                }
+            },
+            "style": {
+                "elevation": 2,
+                "borderRadius": 12
+            }
+        },
+        "children": [
+            {
+                "type": "Column",
+                "properties": {
+                    "mainAxisAlignment": "center",
+                    "crossAxisAlignment": "center",
+                    "mainAxisSize": "min"
+                },
+                "children": [
+                    {
+                        "type": "Icon",
+                        "properties": {
+                            "icon": "devices",
+                            "size": 32.0,
+                            "color": "primary"
+                        }
+                    },
+                    {
+                        "type": "SizedBox",
+                        "properties": {
+                            "height": 8.0
+                        }
+                    },
+                    {
+                        "type": "Text",
+                        "properties": {
+                            "text": {
+                                "$bind": "router.deviceCount"
+                            },
+                            "variant": "headlineMedium",
+                            "color": "primary"
+                        }
+                    },
+                    {
+                        "type": "Text",
+                        "properties": {
+                            "text": "Connected Devices",
+                            "variant": "bodyMedium",
+                            "textAlign": "center"
+                        }
+                    }
+                ]
+            }
+        ]
+    }
+}