feat: enhance LocalAgent configuration and UI components

- Updated .env.example to provide clearer configuration instructions and API key setup.
- Removed debug_env.py as it was no longer needed.
- Refactored main.py to streamline application initialization and workspace setup.
- Introduced a new HistoryManager for managing task execution history.
- Enhanced UI components in chat_view.py and task_guide_view.py to improve user interaction and code preview functionality.
- Added loading indicators and improved task history display in the UI.
- Implemented unit tests for history management and intent classification.

ui/chat_view.py

@@ -1,6 +1,6 @@
 """
 聊天视图组件
-处理普通对话的 UI 展示 - 支持流式消息
+处理普通对话的 UI 展示 - 支持流式消息和加载动画
 """
 
 import tkinter as tk
@@ -8,6 +8,58 @@ from tkinter import scrolledtext
 from typing import Callable, Optional
 
 
+class LoadingIndicator:
+    """加载动画指示器"""
+    
+    FRAMES = ["⠋", "⠙", "⠹", "⠸", "⠼", "⠴", "⠦", "⠧", "⠇", "⠏"]
+    
+    def __init__(self, parent: tk.Widget, text: str = "处理中"):
+        self.parent = parent
+        self.text = text
+        self.frame_index = 0
+        self.running = False
+        self.after_id = None
+        
+        # 创建标签
+        self.label = tk.Label(
+            parent,
+            text="",
+            font=('Microsoft YaHei UI', 10),
+            fg='#ffd54f',
+            bg='#1e1e1e'
+        )
+    
+    def start(self, text: str = None):
+        """开始动画"""
+        if text:
+            self.text = text
+        self.running = True
+        self.label.pack(pady=5)
+        self._animate()
+    
+    def stop(self):
+        """停止动画"""
+        self.running = False
+        if self.after_id:
+            self.parent.after_cancel(self.after_id)
+            self.after_id = None
+        self.label.pack_forget()
+    
+    def update_text(self, text: str):
+        """更新提示文字"""
+        self.text = text
+    
+    def _animate(self):
+        """动画帧更新"""
+        if not self.running:
+            return
+        
+        frame = self.FRAMES[self.frame_index]
+        self.label.config(text=f"{frame} {self.text}...")
+        self.frame_index = (self.frame_index + 1) % len(self.FRAMES)
+        self.after_id = self.parent.after(100, self._animate)
+
+
 class ChatView:
     """
     聊天视图
@@ -22,7 +74,8 @@ class ChatView:
     def __init__(
         self,
         parent: tk.Widget,
-        on_send: Callable[[str], None]
+        on_send: Callable[[str], None],
+        on_show_history: Optional[Callable[[], None]] = None
     ):
         """
         初始化聊天视图
@@ -30,14 +83,19 @@ class ChatView:
         Args:
             parent: 父容器
             on_send: 发送消息回调函数
+            on_show_history: 显示历史记录回调函数
         """
         self.parent = parent
         self.on_send = on_send
+        self.on_show_history = on_show_history
         
         # 流式消息状态
         self._stream_active = False
         self._stream_tag = None
         
+        # 加载指示器
+        self.loading: Optional[LoadingIndicator] = None
+        
         self._create_widgets()
     
     def _create_widgets(self):
@@ -46,15 +104,37 @@ class ChatView:
         self.frame = tk.Frame(self.parent, bg='#1e1e1e')
         self.frame.pack(fill=tk.BOTH, expand=True, padx=10, pady=10)
         
+        # 标题栏（包含标题和历史按钮）
+        title_frame = tk.Frame(self.frame, bg='#1e1e1e')
+        title_frame.pack(fill=tk.X, pady=(0, 10))
+        
         # 标题
         title_label = tk.Label(
-            self.frame,
+            title_frame,
             text="LocalAgent - 本地 AI 助手",
             font=('Microsoft YaHei UI', 16, 'bold'),
             fg='#61dafb',
             bg='#1e1e1e'
         )
-        title_label.pack(pady=(0, 10))
+        title_label.pack(side=tk.LEFT, expand=True)
+        
+        # 历史记录按钮
+        if self.on_show_history:
+            self.history_btn = tk.Button(
+                title_frame,
+                text="📜 历史",
+                font=('Microsoft YaHei UI', 10),
+                bg='#424242',
+                fg='#ce93d8',
+                activebackground='#616161',
+                activeforeground='#ce93d8',
+                relief=tk.FLAT,
+                padx=10,
+                pady=3,
+                cursor='hand2',
+                command=self.on_show_history
+            )
+            self.history_btn.pack(side=tk.RIGHT)
         
         # 消息显示区域
         self.message_area = scrolledtext.ScrolledText(
@@ -118,6 +198,9 @@ class ChatView:
             "- 输入文件处理需求（如\"复制文件\"、\"整理图片\"）将触发执行模式"
         )
         self.add_message(welcome_msg, 'system')
+        
+        # 创建加载指示器（放在消息区域下方）
+        self.loading = LoadingIndicator(self.frame)
     
     def _on_enter_pressed(self, event):
         """回车键处理"""
@@ -214,6 +297,21 @@ class ChatView:
         self.input_entry.config(state=state)
         self.send_button.config(state=state)
     
+    def show_loading(self, text: str = "处理中"):
+        """显示加载动画"""
+        if self.loading:
+            self.loading.start(text)
+    
+    def hide_loading(self):
+        """隐藏加载动画"""
+        if self.loading:
+            self.loading.stop()
+    
+    def update_loading_text(self, text: str):
+        """更新加载提示文字"""
+        if self.loading:
+            self.loading.update_text(text)
+    
     def get_frame(self) -> tk.Frame:
         """获取主框架"""
         return self.frame