Refine tool call summaries and scrolling (#2069)

* feat(app): refine tool call summaries and scrolling

Keep summary groups stable from the first tool call, preserve live activity feedback, and scroll expanded groups to the latest entry. Consolidate web scrollbar styling around the native browser mechanism.

* refactor(app): reuse tool call height constant

* fix(app): preserve tool call summary state

* fix(app): refresh web tool groups on expand

* fix(app): preserve grouped tool errors

packages/app/src/i18n/resources/zh-CN.ts

@@ -1377,8 +1377,6 @@ export const zhCN: TranslationResources = {
     output: "输出",
   },
   toolCallGroup: {
-    title: "工具",
-    accessibilityLabel: "工具，{{count}} 次调用",
     editedFiles: {
       one: "编辑了 {{count}} 个文件",
       other: "编辑了 {{count}} 个文件",
@@ -1503,13 +1501,12 @@ export const zhCN: TranslationResources = {
         description: "默认情况下完全展开 AI 的思考和推理过程",
       },
       toolCallDetail: {
-        label: "工具调用详情",
-        description: "工具活动在智能体时间线中的显示方式",
-        accessibilityLabel: "选择工具调用详情（{{value}}）",
+        label: "工具调用显示",
+        description: "工具调用在时间线中的显示方式",
+        accessibilityLabel: "选择工具调用显示方式（{{value}}）",
         options: {
-          overview: "概览",
-          concise: "简洁",
-          detailed: "详细",
+          overview: "摘要",
+          detailed: "完整详情",
         },
       },
       language: {