refactor: move action buttons to right panel for User mode in material validation

Move the four action buttons (全选, 取消全选, 确认删除, 执行删除) from the
top control panel to the right-side panel below 显示全部 for User mode.
Admin users continue to see these buttons in the top control panel.

Co-Authored-By: Claude (glm-5) <noreply@anthropic.com>

gui/material_validation_tab.py

@@ -185,6 +185,8 @@ class MaterialValidationTab(BaseTab):
         )
         self.start_button.pack(side=tk.LEFT, padx=5)
 
+        # 全选、取消全选、确认删除、执行删除按钮 - 仅管理员显示在顶部控制面板
+        if self.session_manager.is_admin():
             # 全选按钮
             self.select_all_button = ttk.Button(
                 button_frame,
@@ -377,6 +379,45 @@ class MaterialValidationTab(BaseTab):
         )
         self.btn_show_all.pack(fill=tk.X, pady=2)
 
+        # 分隔线
+        ttk.Separator(button_frame, orient='horizontal').pack(fill=tk.X, pady=5)
+
+        # 全选按钮
+        self.select_all_button = ttk.Button(
+            button_frame,
+            text="全选",
+            command=lambda: self._select_all(check=True),
+            state=tk.DISABLED
+        )
+        self.select_all_button.pack(fill=tk.X, pady=2)
+
+        # 取消全选按钮
+        self.deselect_all_button = ttk.Button(
+            button_frame,
+            text="取消全选",
+            command=lambda: self._select_all(check=False),
+            state=tk.DISABLED
+        )
+        self.deselect_all_button.pack(fill=tk.X, pady=2)
+
+        # 确认删除按钮
+        self.confirm_delete_button = ttk.Button(
+            button_frame,
+            text="确认删除",
+            command=self.confirm_deletion,
+            state=tk.DISABLED
+        )
+        self.confirm_delete_button.pack(fill=tk.X, pady=2)
+
+        # 执行删除按钮
+        self.execute_delete_button = ttk.Button(
+            button_frame,
+            text="执行删除",
+            command=self.start_delete_execution,
+            state=tk.DISABLED
+        )
+        self.execute_delete_button.pack(fill=tk.X, pady=2)
+
     def _hide_checked_items(self):
         """隐藏所有已勾选的物料"""
         checked_items = self.tree.get_checked_items()