feat: 愚人节彩蛋 - 假装大模型

[MistEO]

Summary by Sourcery

添加一个愚人节 “MaaGPT” 彩蛋模式，将任务执行重新包装为 AI 推理，并配套主题化的 UI 文案、日志行为和视觉效果，可通过调试设置控制，并支持基于日期的自动激活。

New Features:

• 引入愚人节彩蛋模式，将任务执行伪装成 AI 推理，可在 4 月 1 日自动激活，并支持本地手动覆盖。
• 在状态栏、工具栏和仪表盘中添加 AI 主题的文本和指示器，包括日志面板中的思考动画省略号和令牌计数器。
• 在调试设置中提供开关，用于启用或禁用愚人节体验，并为所有支持的语言提供本地化描述。

Enhancements:

• 扩展日志处理，支持将日志消息转换为 AI 风格，并在任务运行期间注入伪造的“思考中”日志条目。
• 添加 CSS 动画和工具类，以支持思考省略号、令牌脉冲、闪光等 AI 主题视觉效果。

Original summary in English

Summary by Sourcery

Add an April Fools "MaaGPT" Easter egg mode that rebrands task execution as AI reasoning, with themed UI text, log behavior, and visuals, controllable via a debug setting and date-based auto-activation.

New Features:

• Introduce an April Fools Easter egg mode that disguises task execution as AI reasoning, auto-activating on April 1st with an optional local override.
• Add AI-themed status, toolbar, and dashboard texts and indicators, including animated thinking dots and token counters in the logs panel.
• Provide a debug settings toggle for enabling or disabling the April Fools experience, with localized descriptions in all supported languages.

Enhancements:

• Extend log handling to support AI-styled log message transformations and inject fake "thinking" log entries during task runs.
• Add CSS animations and utility classes to support AI-themed visual effects such as thinking dots, token pulse, and sparkles.