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

data/gxde-ai-see-portal.desktop

@@ -0,0 +1,12 @@
+[Desktop Entry]
+Type=Application
+Version=1.0
+Name=GXDE Portal
+Name[zh_CN]=传送门
+Comment=Show or hide the GXDE AI See portal panel
+Comment[zh_CN]=显示或隐藏小埃同学的传送门面板
+Exec=gxde-ai-see --show
+Icon=gxde-ai-see
+Terminal=false
+Categories=Utility;
+StartupNotify=false

data/gxde-ai-see-todo.desktop

@@ -6,7 +6,7 @@ Name[zh_CN]=GXDE 待办
 Comment=Floating todo list of GXDE AI See
 Comment[zh_CN]=小埃同学的待办
 Exec=gxde-ai-see --todo
-Icon=gxde-ai-see
+Icon=gxde-ai-see-todo
 Terminal=false
 Categories=Utility;
 StartupNotify=false

data/icons-src/gxde-ai-see-todo.svg

@@ -0,0 +1,17 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="256" height="256" viewBox="0 0 256 256">
+  <defs>
+    <linearGradient id="g" x1="0" y1="0" x2="0" y2="1">
+      <stop offset="0" stop-color="#4a90ff"/>
+      <stop offset="1" stop-color="#2f6bd8"/>
+    </linearGradient>
+  </defs>
+  <rect x="8" y="8" width="240" height="240" rx="54" fill="url(#g)"/>
+  <rect x="64" y="56" width="128" height="152" rx="16" fill="#ffffff" opacity="0.96"/>
+  <rect x="96" y="40" width="64" height="30" rx="10" fill="#dbe8ff"/>
+  <g stroke="#3d7fe8" stroke-width="9" stroke-linecap="round" fill="none">
+    <path d="M84 114 l14 14 26 -28"/>
+    <path d="M84 158 l14 14 26 -28"/>
+    <path d="M146 118 h30"/>
+    <path d="M146 162 h30"/>
+  </g>
+</svg>