cb9e48f11d
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删除 3 个仅含 UI 占位的 Hand，清理 Rust 实现与前端引用： - Rust: whiteboard.rs(422行) + slideshow.rs(797行) + speech.rs(442行) - 前端: WhiteboardCanvas + SlideshowRenderer + speech-synth + 相关类型/常量 - 配置: 3 个 HAND.toml - 净减 ~5400 行，Hands 9→6(启用) + Quiz/Browser/Researcher/Collector/Clip/Twitter/Reminder