TrayClip v0.3.1

• Default to focusing the clipboard list when the main window is opened, while preserving existing search terms and group filters.
• Add keyboard shortcuts (Ctrl/Cmd + 1–9) to quickly copy the clipboard item corresponding to the given number.
• Improve keyboard event handling: filter out specific key combinations and prevent shortcuts from triggering while typing in input fields.
• Support Ctrl/Cmd + F to focus and select text within the search box.
• Implement keyboard event blocking for overlays such as pop-ups, menus, and editors.
• Update help documentation, the README, and multilingual instructions to detail the new shortcuts and interaction rules.
• Change the default focus upon window launch from the search box to the clipboard list.
• Add unit tests for keyboard-driven operations to ensure consistent behavior across platforms.
• 主窗口打开时，默认将焦点置于剪贴板列表，同时保留现有的搜索词和分组筛选条件。
• 新增键盘快捷键（Ctrl/Cmd + 1–9），用于快速复制对应编号的剪贴板条目。
• 优化键盘事件处理：过滤特定按键组合，防止在输入框内打字时意外触发快捷键。
• 支持使用 Ctrl/Cmd + F 将焦点移至搜索框并选中其中的文本。
• 在弹窗、菜单和编辑器等覆盖层中，实现对键盘事件的拦截。
• 更新帮助文档、README 文件及多语言说明，详细介绍新增的快捷键和交互规则。
• 将窗口启动时的默认焦点从搜索框更改为剪贴板列表。
• 为键盘操作添加单元测试，确保在不同平台上表现一致。