feat: 知识管理平台精简版 - PyQt6桌面应用

主要功能:
- 账号管理：添加/编辑/删除账号，测试登录
- 浏览任务：批量浏览应读/选读内容并标记已读
- 截图管理：wkhtmltoimage截图，查看历史
- 金山文档：扫码登录/微信快捷登录，自动上传截图

技术栈:
- PyQt6 GUI框架
- Playwright 浏览器自动化
- SQLite 本地数据存储
- wkhtmltoimage 网页截图

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

ui/log_widget.py

@@ -0,0 +1,120 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+"""
+Log display panel - collapsible log output area
+"""
+
+from datetime import datetime
+from PyQt6.QtWidgets import (
+    QWidget, QVBoxLayout, QHBoxLayout, QPlainTextEdit,
+    QPushButton, QFrame, QLabel
+)
+from PyQt6.QtCore import Qt, pyqtSlot
+from PyQt6.QtGui import QTextCursor
+
+from .constants import LOG_MIN_HEIGHT, BUTTON_HEIGHT_SMALL, BUTTON_SPACING
+
+
+class LogWidget(QWidget):
+    """Log display panel"""
+
+    def __init__(self, parent=None):
+        super().__init__(parent)
+        self.setObjectName("log_widget")
+        self._collapsed = False
+        self._max_lines = 500
+        self._setup_ui()
+
+    def _setup_ui(self):
+        """Setup UI"""
+        layout = QVBoxLayout(self)
+        layout.setContentsMargins(0, 0, 0, 0)
+        layout.setSpacing(0)
+
+        # Header bar
+        header = QFrame()
+        header.setFixedHeight(36)
+        header.setStyleSheet("background-color: rgba(0,0,0,0.03); border-bottom: 1px solid rgba(0,0,0,0.08);")
+        header_layout = QHBoxLayout(header)
+        header_layout.setContentsMargins(16, 0, 16, 0)
+        header_layout.setSpacing(BUTTON_SPACING)
+
+        # Title
+        title = QLabel("📜 日志输出")
+        title.setStyleSheet("font-weight: bold; font-size: 13px;")
+        header_layout.addWidget(title)
+
+        header_layout.addStretch()
+
+        # Clear button
+        self._clear_btn = QPushButton("清空")
+        self._clear_btn.setFixedWidth(60)
+        self._clear_btn.setFixedHeight(BUTTON_HEIGHT_SMALL)
+        self._clear_btn.clicked.connect(self.clear)
+        header_layout.addWidget(self._clear_btn)
+
+        # Toggle button
+        self._toggle_btn = QPushButton("▼")
+        self._toggle_btn.setFixedWidth(36)
+        self._toggle_btn.setFixedHeight(BUTTON_HEIGHT_SMALL)
+        self._toggle_btn.clicked.connect(self._toggle_collapse)
+        header_layout.addWidget(self._toggle_btn)
+
+        layout.addWidget(header)
+
+        # Log text area
+        self._text_edit = QPlainTextEdit()
+        self._text_edit.setReadOnly(True)
+        self._text_edit.setMinimumHeight(LOG_MIN_HEIGHT)
+        self._text_edit.setMaximumHeight(250)
+        self._text_edit.setStyleSheet("""
+            QPlainTextEdit {
+                font-family: "Consolas", "Monaco", "Courier New", monospace;
+                font-size: 12px;
+                line-height: 1.5;
+                padding: 8px 12px;
+            }
+        """)
+        layout.addWidget(self._text_edit)
+
+    def _toggle_collapse(self):
+        """Toggle collapse state"""
+        self._collapsed = not self._collapsed
+        self._text_edit.setVisible(not self._collapsed)
+        self._toggle_btn.setText("▲" if self._collapsed else "▼")
+
+    @pyqtSlot(str)
+    def append_log(self, message: str):
+        """Append log message"""
+        timestamp = datetime.now().strftime("%H:%M:%S")
+        formatted = f"[{timestamp}] {message}"
+
+        self._text_edit.appendPlainText(formatted)
+
+        # Limit lines
+        doc = self._text_edit.document()
+        if doc.blockCount() > self._max_lines:
+            cursor = QTextCursor(doc)
+            cursor.movePosition(QTextCursor.MoveOperation.Start)
+            cursor.select(QTextCursor.SelectionType.BlockUnderCursor)
+            cursor.movePosition(
+                QTextCursor.MoveOperation.Down,
+                QTextCursor.MoveMode.KeepAnchor,
+                doc.blockCount() - self._max_lines
+            )
+            cursor.removeSelectedText()
+
+        # Scroll to bottom
+        self._text_edit.moveCursor(QTextCursor.MoveOperation.End)
+
+    def log(self, message: str):
+        """Log alias"""
+        self.append_log(message)
+
+    def clear(self):
+        """Clear log"""
+        self._text_edit.clear()
+
+    def get_text(self) -> str:
+        """Get all log text"""
+        return self._text_edit.toPlainText()