feat(dc): Complete Tool C quick action buttons Phase 1-2 - 7 functions

Summary:
- Implement 7 quick action functions (filter, recode, binning, conditional, dropna, compute, pivot)
- Refactor to pre-written Python functions architecture (stable and secure)
- Add 7 Python operations modules with full type hints
- Add 7 frontend Dialog components with user-friendly UI
- Fix NaN serialization issues and auto type conversion
- Update all related documentation

Technical Details:
- Python: operations/ module (filter.py, recode.py, binning.py, conditional.py, dropna.py, compute.py, pivot.py)
- Backend: QuickActionService.ts with 7 execute methods
- Frontend: 7 Dialog components with complete validation
- Toolbar: Enable 7 quick action buttons

Status: Phase 1-2 completed, basic testing passed, ready for further testing

frontend-v2/src/shared/components/Chat/styles/chat.css

@@ -3,27 +3,59 @@
  * 基于 Ant Design X
  */
 
-/* ========== ChatContainer ========== */
+/* ========== ChatContainer（✅ 优化4.2：浅渐变背景）========== */
 .chat-container {
   display: flex;
   flex-direction: column;
   height: 100%;
   background: #ffffff;
-  border-left: 1px solid #e2e8f0; /* 增强左侧边框 */
+  border-left: 1px solid #e2e8f0;
 }
 
 .chat-messages {
   flex: 1;
   overflow-y: auto;
-  padding: 20px;
-  background: linear-gradient(to bottom, #ffffff 0%, #f8fafc 100%); /* 渐变背景 */
+  padding: 24px; /* ✅ 优化：增加内边距到24px */
+  background: linear-gradient(to bottom, #fafafa 0%, #f0f0f0 100%); /* ✅ 优化：渐变更明显 */
 }
 
 .chat-input {
-  border-top: 2px solid #e2e8f0; /* 增强顶部边框 */
+  border-top: 2px solid #e2e8f0;
   padding: 16px;
   background: #ffffff;
-  box-shadow: 0 -2px 8px rgba(0, 0, 0, 0.05); /* 添加阴影 */
+  box-shadow: 0 -2px 8px rgba(0, 0, 0, 0.05);
+}
+
+/* ========== 对话气泡样式（✅ 优化4.5：白卡片阴影+用户右对齐）========== */
+/* AI助手消息：白卡片带阴影 */
+:global(.ant-bubble-message-role-assistant) {
+  background: #ffffff !important;
+  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08) !important;
+  border: 1px solid #e5e7eb !important;
+  border-radius: 12px !important;
+  padding: 16px !important;
+  max-width: 85%;
+  margin-left: 0;
+  margin-right: auto;
+}
+
+/* 用户消息：Emerald绿色气泡，右对齐 */
+:global(.ant-bubble-message-role-user) {
+  background: linear-gradient(135deg, #10b981 0%, #059669 100%) !important;
+  color: white !important;
+  box-shadow: 0 2px 6px rgba(16, 185, 129, 0.2) !important;
+  border: none !important;
+  border-radius: 12px !important;
+  padding: 12px 16px !important;
+  max-width: 70%;
+  margin-left: auto !important;
+  margin-right: 0 !important;
+  text-align: left;
+}
+
+/* 用户消息文字颜色 */
+:global(.ant-bubble-message-role-user *) {
+  color: white !important;
 }
 
 /* ========== MessageRenderer ========== */
@@ -45,14 +77,14 @@
   color: #595959;
 }
 
-/* ========== CodeBlockRenderer ========== */
+/* ========== CodeBlockRenderer（✅ 优化4.3-4.4：幽灵按钮+代码块阴影）========== */
 .code-block-container {
   margin-top: 12px;
-  border: 2px solid #10b981; /* 翠绿色边框 */
+  border: 1px solid #d1d5db; /* ✅ 优化4.4：边框变细 */
   border-radius: 12px;
   overflow: hidden;
   background: #1e1e1e;
-  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.15); /* 翠绿色阴影 */
+  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08); /* ✅ 优化4.4：阴影柔和化 */
 }
 
 .code-block-header {
@@ -71,8 +103,20 @@
   font-weight: 500;
 }
 
+/* ✅ 优化4.3：幽灵按钮样式 */
 .execute-button {
   font-size: 12px;
+  border: 1px solid rgba(16, 185, 129, 0.4) !important;
+  background: transparent !important;
+  color: #10b981 !important;
+  transition: all 0.2s ease;
+}
+
+.execute-button:hover {
+  border-color: #10b981 !important;
+  background: rgba(16, 185, 129, 0.1) !important;
+  color: #10b981 !important;
+  transform: translateY(-1px);
 }
 
 .code-block {
@@ -123,21 +167,22 @@
   }
 }
 
-/* ========== 滚动条样式 ========== */
+/* ========== 滚动条样式（✅ 优化：统一样式）========== */
 .chat-messages::-webkit-scrollbar {
-  width: 6px;
+  width: 8px;
 }
 
 .chat-messages::-webkit-scrollbar-track {
-  background: #f0f0f0;
-  border-radius: 3px;
+  background: #f8fafc;
+  border-radius: 4px;
 }
 
 .chat-messages::-webkit-scrollbar-thumb {
-  background: #bfbfbf;
-  border-radius: 3px;
+  background: #cbd5e1;
+  border-radius: 4px;
+  border: 2px solid #f8fafc;
 }
 
 .chat-messages::-webkit-scrollbar-thumb:hover {
-  background: #8c8c8c;
+  background: #94a3b8;
 }

frontend-v2/src/shared/components/index.ts

@@ -10,3 +10,5 @@ export * from './Chat';
 // 其他通用组件
 export { default as Placeholder } from './Placeholder';
 
+
+