feat: 添加依赖自动检测与安装、选项记忆、KDocs登录优化

- 新增依赖检测模块：启动时自动检测wkhtmltoimage和Playwright Chromium
- 新增依赖安装对话框：缺失时提示用户一键下载安装
- 修复选项记忆功能：浏览类型、自动截图、自动上传选项现在会保存
- 优化KDocs登录检测：未登录时自动切换到金山文档页面并显示二维码
- 简化日志输出：移除debug信息，保留用户友好的状态提示
- 新增账号变化信号：账号管理页面的修改会自动同步到浏览任务页面

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

ui/dependency_dialog.py

@@ -0,0 +1,201 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+"""
+依赖安装对话框
+检测到缺失依赖时显示，让用户选择是否下载安装
+"""
+
+from PyQt6.QtWidgets import (
+    QDialog, QVBoxLayout, QHBoxLayout, QLabel, QPushButton,
+    QProgressBar, QCheckBox, QGroupBox, QMessageBox
+)
+from PyQt6.QtCore import Qt, QThread, pyqtSignal
+
+
+class DownloadThread(QThread):
+    """下载线程"""
+    progress = pyqtSignal(int, int)  # downloaded, total
+    log = pyqtSignal(str)
+    finished = pyqtSignal(bool, str)  # success, message
+
+    def __init__(self, dep_name: str):
+        super().__init__()
+        self.dep_name = dep_name
+
+    def run(self):
+        from utils.dependency_installer import download_and_install_dependency
+
+        def on_progress(downloaded, total):
+            self.progress.emit(downloaded, total)
+
+        def on_log(msg):
+            self.log.emit(msg)
+
+        success, message = download_and_install_dependency(
+            self.dep_name,
+            progress_callback=on_progress,
+            log_callback=on_log
+        )
+        self.finished.emit(success, message)
+
+
+class DependencyDialog(QDialog):
+    """依赖安装对话框"""
+
+    def __init__(self, missing_deps: dict, parent=None):
+        super().__init__(parent)
+        self.missing_deps = missing_deps
+        self.download_threads = []
+        self.setWindowTitle("环境检测")
+        self.setMinimumWidth(450)
+        self.setModal(True)
+        self._setup_ui()
+
+    def _setup_ui(self):
+        layout = QVBoxLayout(self)
+        layout.setSpacing(16)
+        layout.setContentsMargins(20, 20, 20, 20)
+
+        # 标题
+        title = QLabel("⚠️ 检测到缺少必要的运行环境")
+        title.setStyleSheet("font-size: 16px; font-weight: bold; color: #fa8c16;")
+        layout.addWidget(title)
+
+        # 说明
+        desc = QLabel("以下组件缺失，部分功能可能无法正常使用：")
+        desc.setStyleSheet("color: #666;")
+        layout.addWidget(desc)
+
+        # 缺失组件列表
+        deps_group = QGroupBox("缺失组件")
+        deps_layout = QVBoxLayout(deps_group)
+
+        self.checkboxes = {}
+
+        if self.missing_deps.get("wkhtmltoimage"):
+            cb = QCheckBox("wkhtmltoimage（截图功能需要）")
+            cb.setChecked(True)
+            self.checkboxes["wkhtmltoimage"] = cb
+            deps_layout.addWidget(cb)
+
+        if self.missing_deps.get("chromium"):
+            cb = QCheckBox("Playwright Chromium（金山文档上传需要）")
+            cb.setChecked(True)
+            self.checkboxes["chromium"] = cb
+            deps_layout.addWidget(cb)
+
+        layout.addWidget(deps_group)
+
+        # 进度区域
+        self.progress_group = QGroupBox("安装进度")
+        progress_layout = QVBoxLayout(self.progress_group)
+
+        self.status_label = QLabel("等待开始...")
+        self.status_label.setStyleSheet("color: #666;")
+        progress_layout.addWidget(self.status_label)
+
+        self.progress_bar = QProgressBar()
+        self.progress_bar.setRange(0, 100)
+        self.progress_bar.setValue(0)
+        progress_layout.addWidget(self.progress_bar)
+
+        self.progress_group.setVisible(False)
+        layout.addWidget(self.progress_group)
+
+        # 按钮
+        btn_layout = QHBoxLayout()
+        btn_layout.addStretch()
+
+        self.skip_btn = QPushButton("跳过")
+        self.skip_btn.setMinimumWidth(80)
+        self.skip_btn.clicked.connect(self.reject)
+        btn_layout.addWidget(self.skip_btn)
+
+        self.install_btn = QPushButton("立即安装")
+        self.install_btn.setObjectName("primary")
+        self.install_btn.setMinimumWidth(100)
+        self.install_btn.clicked.connect(self._start_install)
+        btn_layout.addWidget(self.install_btn)
+
+        layout.addLayout(btn_layout)
+
+    def _start_install(self):
+        """开始安装"""
+        # 获取选中的组件
+        selected = [name for name, cb in self.checkboxes.items() if cb.isChecked()]
+
+        if not selected:
+            QMessageBox.information(self, "提示", "请选择要安装的组件")
+            return
+
+        # 禁用按钮和复选框
+        self.install_btn.setEnabled(False)
+        self.skip_btn.setText("取消")
+        for cb in self.checkboxes.values():
+            cb.setEnabled(False)
+
+        # 显示进度
+        self.progress_group.setVisible(True)
+
+        # 开始安装
+        self._install_queue = selected.copy()
+        self._install_next()
+
+    def _install_next(self):
+        """安装下一个组件"""
+        if not self._install_queue:
+            # 全部完成
+            self.status_label.setText("✅ 安装完成！")
+            self.status_label.setStyleSheet("color: #52c41a; font-weight: bold;")
+            self.skip_btn.setText("完成")
+            self.skip_btn.clicked.disconnect()
+            self.skip_btn.clicked.connect(self.accept)
+            return
+
+        dep_name = self._install_queue.pop(0)
+        display_name = "wkhtmltoimage" if dep_name == "wkhtmltoimage" else "Chromium 浏览器"
+        self.status_label.setText(f"正在下载 {display_name}...")
+        self.progress_bar.setValue(0)
+
+        # 启动下载线程
+        thread = DownloadThread(dep_name)
+        thread.progress.connect(self._on_progress)
+        thread.log.connect(self._on_log)
+        thread.finished.connect(self._on_finished)
+        thread.start()
+        self.download_threads.append(thread)
+
+    def _on_progress(self, downloaded: int, total: int):
+        """下载进度更新"""
+        if total > 0:
+            percent = int(downloaded * 100 / total)
+            self.progress_bar.setValue(percent)
+            mb_downloaded = downloaded / 1024 / 1024
+            mb_total = total / 1024 / 1024
+            self.status_label.setText(f"下载中... {mb_downloaded:.1f}MB / {mb_total:.1f}MB")
+
+    def _on_log(self, msg: str):
+        """日志更新"""
+        self.status_label.setText(msg)
+
+    def _on_finished(self, success: bool, message: str):
+        """安装完成"""
+        if success:
+            if message:
+                # wkhtmltoimage 需要手动完成安装向导
+                QMessageBox.information(self, "提示", message)
+            # 继续安装下一个
+            self._install_next()
+        else:
+            self.status_label.setText(f"❌ 安装失败: {message}")
+            self.status_label.setStyleSheet("color: #ff4d4f;")
+            self.install_btn.setEnabled(True)
+            self.skip_btn.setText("跳过")
+
+    def closeEvent(self, event):
+        """关闭时停止所有线程"""
+        for thread in self.download_threads:
+            if thread.isRunning():
+                thread.terminate()
+                thread.wait()
+        event.accept()