release(ios): 发布 0.2.1 并重构图标与界面细节

- 应用图标改用与 Web favicon 同源的扁平标记，金色 SIM 卡体加三格递增信号，29pt 下仍可读
- 标签统一为胶囊形状，提高深色主题下的描边权重，避免标签在暗色下消失
- 消息卡片与详情分区卡片收紧行距，单屏信息密度明显提升
- 详情头部指标精简为 4 行，数据模块改为单条读数
- 批量选择勾选框移出名称区域，工具栏控件统一为等高 34pt
- 分组编辑器改为点选即生效，移除说明文字与常驻禁用按钮

apps/ios/Sources/MultiSimAdmin/Features/Fleet/InstanceGroupManagerView.swift

@@ -8,6 +8,7 @@ struct InstanceGroupManagerView: View {
   @State private var editingName = ""
   @State private var validationMessage: String?
   @State private var isWorking = false
+  @State private var pendingDelete: InstanceGroup?
 
   var body: some View {
     NavigationStack {
@@ -62,24 +63,16 @@ struct InstanceGroupManagerView: View {
 
                   Spacer()
 
-                  Button {
+                  AISymbolAction("重命名分组 \(group.name)", systemImage: "pencil", tint: AITheme.muted) {
                     editingGroup = group
                     editingName = group.name
                     validationMessage = nil
-                  } label: {
-                    Image(systemName: "pencil")
                   }
-                  .buttonStyle(AIButtonStyle(kind: .secondary, size: .toolbarInline, fixedWidth: 44))
 
-                  Button {
-                    Task {
-                      await delete(group)
-                    }
-                  } label: {
-                    Image(systemName: "trash")
+                  AISymbolAction("删除分组 \(group.name)", systemImage: "trash", tint: AITheme.danger) {
+                    pendingDelete = group
                   }
-                  .buttonStyle(AIButtonStyle(kind: .danger, size: .toolbarInline, fixedWidth: 44))
-                  .disabled(instanceCount(group.id) > 0 || isWorking)
+                  .disabled(isWorking)
                 }
               }
             }
@@ -124,6 +117,23 @@ struct InstanceGroupManagerView: View {
       } message: {
         Text("分组名称最多 100 个字符。")
       }
+      .confirmationDialog(
+        pendingDelete == nil
+          ? "删除分组？"
+          : "删除「\(pendingDelete!.name)」？该分组下的 \(instanceCount(pendingDelete!.id)) 个实例会回到未分组。",
+        isPresented: Binding(
+          get: { pendingDelete != nil },
+          set: { if !$0 { pendingDelete = nil } }
+        ),
+        titleVisibility: .visible
+      ) {
+        if let group = pendingDelete {
+          Button("删除分组", role: .destructive) {
+            Task { await delete(group) }
+          }
+        }
+        Button("取消", role: .cancel) {}
+      }
       .task {
         await model.loadGroups()
       }
@@ -163,6 +173,7 @@ struct InstanceGroupManagerView: View {
   private func delete(_ group: InstanceGroup) async {
     guard !isWorking else { return }
     isWorking = true
+    pendingDelete = nil
     do {
       try await model.deleteGroup(group.id)
     } catch {