feat(chat): 优化聊天面板交互体验 — 推理折叠/智能滚动/工具中文名/代码块按钮

src/web/styles.css

@@ -141,6 +141,7 @@ body {
   flex-direction: column;
   min-height: 0;
   min-width: 0;
+  position: relative;
 }
 
 .chat-welcome-area {
@@ -251,6 +252,47 @@ body {
   color: var(--ant-color-text-secondary);
 }
 
+.chat-scroll-bottom-btn {
+  position: absolute;
+  bottom: 115px;
+  left: 50%;
+  transform: translateX(-50%);
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  z-index: 10;
+  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
+}
+
+[data-streamdown="code-block-actions"] {
+  gap: 4px;
+}
+
+[data-streamdown="code-block-actions"] button {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  min-width: 28px;
+  height: 28px;
+  padding: 0 6px;
+  border-radius: var(--ant-border-radius-sm);
+  border: 1px solid var(--ant-color-border-secondary);
+  background: var(--ant-color-bg-container);
+  color: var(--ant-color-text-secondary);
+  font-size: 12px;
+  transition: all 0.2s;
+}
+
+[data-streamdown="code-block-actions"] button:hover {
+  color: var(--ant-color-primary);
+  border-color: var(--ant-color-primary);
+}
+
+[data-streamdown="code-block-actions"] button svg {
+  width: 14px;
+  height: 14px;
+}
+
 .app-page-flex {
   flex: 1;
 }