feat(panel/chat): 显隐切换、暂存清空隐藏、菜单避让、待办联动、DTK 关于

- 传送门 desktop 入口，--show 再点一次回 daemon；右键菜单加隐藏
- 暂存区清空后整个面板隐藏
- 右键菜单弹到面板左侧，避免被自己遮挡
- 启动悬停 80ms
- 添加待办后立即打开待办窗口；待办独立图标
- 分词胶囊按浅/深色取色，修复透明不可见
- 关于改用 DAboutDialog
- 聊天消息下方常驻 复制/编辑/重试；助手消息可编辑、可从任意一条重试

src/chat/chatview.cpp

@@ -182,15 +182,16 @@ public:
             connect(fork, &QToolButton::clicked, this,
                     [this]() { Q_EMIT forkRequested(m_index); });
             actions->addWidget(fork);
-            if (m_isLast) {
-                auto *retry = actionButton(tr("重试"), m_actions);
-                connect(retry, &QToolButton::clicked, this,
-                        [this]() { Q_EMIT retryRequested(); });
-                actions->addWidget(retry);
-            }
+            auto *edit = actionButton(tr("编辑"), m_actions);
+            connect(edit, &QToolButton::clicked, this,
+                    [this]() { Q_EMIT editRequested(m_index); });
+            actions->addWidget(edit);
+            auto *retry = actionButton(tr("重试"), m_actions);
+            connect(retry, &QToolButton::clicked, this,
+                    [this]() { Q_EMIT retryRequested(m_index); });
+            actions->addWidget(retry);
         }
         actions->addStretch();
-        m_actions->hide();
         column->addWidget(m_actions);
 
         if (m_isUser) {
@@ -220,21 +221,10 @@ signals:
     void copyRequested(int index);
     void editRequested(int index);
     void forkRequested(int index);
-    void retryRequested();
+    void retryRequested(int index);
     void linkActivated(const QUrl &url);
 
 protected:
-    void enterEvent(QEnterEvent *event) override
-    {
-        m_actions->show();
-        QWidget::enterEvent(event);
-    }
-
-    void leaveEvent(QEvent *event) override
-    {
-        m_actions->hide();
-        QWidget::leaveEvent(event);
-    }
 
 private:
     ChatMessage m_message;

src/chat/chatview.h

@@ -36,7 +36,7 @@ signals:
     void copyRequested(int index);
     void editRequested(int index);
     void forkRequested(int index);
-    void retryRequested();
+    void retryRequested(int index);
     void linkActivated(const QUrl &url);
 
 protected:

src/chat/chatwindow.cpp

@@ -5,6 +5,8 @@
 
 #include "config.h"
 #include "chatview.h"
+
+#include "../ui/aboutdialog.h"
 #include "markdown.h"
 #include "mcpclient.h"
 
@@ -555,7 +557,9 @@ void ChatWindow::setupUi()
     });
     connect(m_messages, &ChatMessageList::editRequested, this, &ChatWindow::editMessage);
     connect(m_messages, &ChatMessageList::forkRequested, this, &ChatWindow::forkFrom);
-    connect(m_messages, &ChatMessageList::retryRequested, this, &ChatWindow::retryLast);
+    connect(m_messages, &ChatMessageList::retryRequested, this, [this](int index) {
+        retryFrom(index);
+    });
 
     auto *menu = new QMenu(menuButton);
     menu->addAction(tr("压缩上下文"), this, [this]() { beginCompression(false); });
@@ -925,9 +929,6 @@ void ChatWindow::editMessage(int index)
     if (index < 0 || index >= conversation.messages.size()) {
         return;
     }
-    if (conversation.messages.at(index).role != QStringLiteral("user")) {
-        return;
-    }
 
     QDialog dialog(this);
     dialog.setWindowTitle(tr("编辑消息"));
@@ -959,6 +960,27 @@ void ChatWindow::editMessage(int index)
     requestCompletion();
 }
 
+void ChatWindow::retryFrom(int index)
+{
+    if (m_client->busy() || m_compressing || m_current < 0) {
+        return;
+    }
+    ChatConversation &conversation = m_conversations[m_current];
+    if (index < 0 || index >= conversation.messages.size()) {
+        return;
+    }
+    if (conversation.messages.at(index).role != QStringLiteral("assistant")) {
+        return;
+    }
+
+    /* drop everything from the assistant answer on, then regenerate it */
+    conversation.messages.resize(index);
+    conversation.updatedAt = QDateTime::currentMSecsSinceEpoch();
+    save();
+    renderConversation();
+    requestCompletion();
+}
+
 void ChatWindow::retryLast()
 {
     if (m_client->busy() || m_compressing || m_current < 0) {
@@ -1028,15 +1050,7 @@ void ChatWindow::handleAnchor(const QUrl &url)
 
 void ChatWindow::showAbout()
 {
-    QMessageBox::about(
-        this, tr("关于小埃同学"),
-        tr("<h3>GXDE 小埃同学</h3>"
-           "<p>版本 %1</p>"
-           "<p>GXDE 桌面的 AI 助手：传送门、内容工厂、待办与对话。</p>"
-           "<p>许可证：GPL-3.0-or-later<br/>"
-           "仓库：<a href='https://gitee.com/GXDE-OS/gxde-ai-see'>"
-           "gitee.com/GXDE-OS/gxde-ai-see</a></p>")
-            .arg(QCoreApplication::applicationVersion()));
+    showAboutDialog(this, tr("GXDE 桌面的 AI 助手：传送门、内容工厂、待办与对话。"));
 }
 
 void ChatWindow::appendError(const QString &message)

src/chat/chatwindow.h

@@ -68,6 +68,7 @@ private:
     void sendPayload();
     void editMessage(int index);
     void retryLast();
+    void retryFrom(int index);
     void forkFrom(int index);
     void beginCompression(bool thenSend);
     void handleAnchor(const QUrl &url);