Constant FORM_SELECT_COMPACT_CLASS 

pub const FORM_SELECT_COMPACT_CLASS: &str = "inline-flex w-auto cursor-pointer select-none text-left text-sm pl-3 pr-8 py-1 border border-paper-border rounded-lg bg-paper-theme text-paper-primary focus:outline-none focus:border-paper-accent focus:ring-1 focus:ring-paper-accent/30 transition-colors duration-200";

FormSelect 紧凑触发器样式：工具栏内联小下拉（自动刷新、导出格式等）。 自动宽度 + text-sm + 小圆角，chevron 与面板样式与默认表单款一致。