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/task_guide_view.py

@@ -243,6 +243,9 @@ class TaskGuideView:
         # 执行计划区域（Markdown）
         self._create_plan_section()
         
+        # 代码预览区域（可折叠）
+        self._create_code_section()
+        
         # 风险提示区域
         self._create_risk_section()
         
@@ -306,6 +309,148 @@ class TaskGuideView:
         scrollbar.pack(side=tk.RIGHT, fill=tk.Y)
         self.plan_text.pack(side=tk.LEFT, fill=tk.BOTH, expand=True)
     
+    def _create_code_section(self):
+        """创建代码预览区域（可折叠）"""
+        # 折叠状态
+        self._code_expanded = False
+        
+        # 外层框架
+        self.code_section = tk.LabelFrame(
+            self.frame,
+            text=" 💻 生成的代码 ",
+            font=('Microsoft YaHei UI', 10, 'bold'),
+            fg='#64b5f6',
+            bg='#1e1e1e',
+            relief=tk.GROOVE
+        )
+        self.code_section.pack(fill=tk.X, padx=10, pady=3)
+        
+        # 展开/折叠按钮
+        self.toggle_code_btn = tk.Button(
+            self.code_section,
+            text="▶ 点击展开代码预览",
+            font=('Microsoft YaHei UI', 9),
+            bg='#2d2d2d',
+            fg='#64b5f6',
+            activebackground='#3d3d3d',
+            activeforeground='#64b5f6',
+            relief=tk.FLAT,
+            cursor='hand2',
+            command=self._toggle_code_view
+        )
+        self.toggle_code_btn.pack(fill=tk.X, padx=5, pady=5)
+        
+        # 代码显示区域（初始隐藏）
+        self.code_frame = tk.Frame(self.code_section, bg='#1e1e1e')
+        
+        # 代码文本框
+        self.code_text = tk.Text(
+            self.code_frame,
+            wrap=tk.NONE,
+            font=('Consolas', 10),
+            bg='#1e1e1e',
+            fg='#d4d4d4',
+            insertbackground='white',
+            relief=tk.FLAT,
+            height=12,
+            padx=8,
+            pady=5
+        )
+        
+        # 配置代码高亮标签
+        self.code_text.tag_configure('keyword', foreground='#569cd6')
+        self.code_text.tag_configure('string', foreground='#ce9178')
+        self.code_text.tag_configure('comment', foreground='#6a9955')
+        self.code_text.tag_configure('function', foreground='#dcdcaa')
+        self.code_text.tag_configure('number', foreground='#b5cea8')
+        
+        # 滚动条
+        code_scrollbar_y = ttk.Scrollbar(self.code_frame, orient=tk.VERTICAL, command=self.code_text.yview)
+        code_scrollbar_x = ttk.Scrollbar(self.code_frame, orient=tk.HORIZONTAL, command=self.code_text.xview)
+        self.code_text.configure(yscrollcommand=code_scrollbar_y.set, xscrollcommand=code_scrollbar_x.set)
+        
+        code_scrollbar_y.pack(side=tk.RIGHT, fill=tk.Y)
+        code_scrollbar_x.pack(side=tk.BOTTOM, fill=tk.X)
+        self.code_text.pack(side=tk.LEFT, fill=tk.BOTH, expand=True)
+        
+        # 复制按钮
+        self.copy_code_btn = tk.Button(
+            self.code_frame,
+            text="📋 复制代码",
+            font=('Microsoft YaHei UI', 9),
+            bg='#424242',
+            fg='white',
+            activebackground='#616161',
+            activeforeground='white',
+            relief=tk.FLAT,
+            cursor='hand2',
+            command=self._copy_code
+        )
+    
+    def _toggle_code_view(self):
+        """切换代码预览的展开/折叠状态"""
+        self._code_expanded = not self._code_expanded
+        
+        if self._code_expanded:
+            self.toggle_code_btn.config(text="▼ 点击折叠代码预览")
+            self.code_frame.pack(fill=tk.BOTH, expand=True, padx=3, pady=(0, 5))
+            self.copy_code_btn.pack(pady=5)
+        else:
+            self.toggle_code_btn.config(text="▶ 点击展开代码预览")
+            self.copy_code_btn.pack_forget()
+            self.code_frame.pack_forget()
+    
+    def _copy_code(self):
+        """复制代码到剪贴板"""
+        code = self.code_text.get(1.0, tk.END).strip()
+        self.frame.clipboard_clear()
+        self.frame.clipboard_append(code)
+        
+        # 显示复制成功提示
+        original_text = self.copy_code_btn.cget('text')
+        self.copy_code_btn.config(text="✓ 已复制!")
+        self.frame.after(1500, lambda: self.copy_code_btn.config(text=original_text))
+    
+    def _apply_syntax_highlight(self, code: str):
+        """应用简单的语法高亮"""
+        import re
+        
+        # 关键字
+        keywords = r'\b(import|from|def|class|if|else|elif|for|while|try|except|finally|with|as|return|yield|raise|pass|break|continue|and|or|not|in|is|None|True|False|lambda|global|nonlocal)\b'
+        # 字符串
+        strings = r'(\"\"\"[\s\S]*?\"\"\"|\'\'\'[\s\S]*?\'\'\'|\"[^\"]*\"|\'[^\']*\')'
+        # 注释
+        comments = r'(#.*$)'
+        # 函数调用
+        functions = r'\b([a-zA-Z_][a-zA-Z0-9_]*)\s*\('
+        # 数字
+        numbers = r'\b(\d+\.?\d*)\b'
+        
+        # 先插入纯文本
+        self.code_text.delete(1.0, tk.END)
+        self.code_text.insert(1.0, code)
+        
+        # 应用高亮
+        for match in re.finditer(keywords, code, re.MULTILINE):
+            start = f"1.0+{match.start()}c"
+            end = f"1.0+{match.end()}c"
+            self.code_text.tag_add('keyword', start, end)
+        
+        for match in re.finditer(strings, code, re.MULTILINE):
+            start = f"1.0+{match.start()}c"
+            end = f"1.0+{match.end()}c"
+            self.code_text.tag_add('string', start, end)
+        
+        for match in re.finditer(comments, code, re.MULTILINE):
+            start = f"1.0+{match.start()}c"
+            end = f"1.0+{match.end()}c"
+            self.code_text.tag_add('comment', start, end)
+        
+        for match in re.finditer(numbers, code, re.MULTILINE):
+            start = f"1.0+{match.start(1)}c"
+            end = f"1.0+{match.end(1)}c"
+            self.code_text.tag_add('number', start, end)
+    
     def _create_risk_section(self):
         """创建风险提示区域"""
         section = tk.LabelFrame(
@@ -423,6 +568,12 @@ class TaskGuideView:
         """设置执行计划（Markdown 格式）"""
         self.plan_text.set_markdown(plan)
     
+    def set_code(self, code: str):
+        """设置生成的代码"""
+        self.code_text.config(state=tk.NORMAL)
+        self._apply_syntax_highlight(code)
+        self.code_text.config(state=tk.DISABLED)
+    
     def set_risk_info(self, info: str):
         """设置风险提示"""
         self.risk_label.config(text=info)