feat: 增加已读历史记录能力，并支持区分已读文本，允许设置跳过是仅已读文本还是全部文本

[ChangeSuger]

#663 #771

基于目前 WebGal 的 Scene 记录逻辑而设计的已读历史记录功能，基于 sceneName 与 currentSentenceId 进行已读信息记录以及判断。该已读历史记录功能以单个 Scene 的脚本为单元进行已读历史记录，并使用 Uint8Array 来减少存储体积。

在已读历史记录功能及基础上，实现了以下能力：

• 区分已读文本与未读文本，允许用户自定义已读文本的样式
• 支持设置快进模式为跳过已读或跳过全部，默认为跳过已读

[gemini-code-assist]

Code Review

This pull request implements a read history system to track viewed text and introduces a skip mode to toggle between skipping only read content or all content. Key additions include a ReadHistoryManager using bitsets for efficient storage and UI updates to visually distinguish read text. Feedback focuses on addressing potential out-of-bounds errors in bitset management, preventing stack overflow issues when encoding large history data, and adding guard clauses for empty scenario names.

[gemini-code-assist]

If scenarioName is an empty string (which can happen during initialization or transition), the manager will attempt to record history for an invalid key. It's better to add a guard clause.

Suggested change

	const scenarioName = this.sceneManager.sceneData.currentScene.sceneName;
	const index = this.sceneManager.sceneData.currentSentenceId;
	const scenarioName = this.sceneManager.sceneData.currentScene.sceneName;
	if (!scenarioName) return;
	const index = this.sceneManager.sceneData.currentSentenceId;

[ChangeSuger]

在 Terre 也测试了下，不管是开发调试还是导出后，新增的功能都能正常运作。唯一一个问题是已读文本的颜色设置涉及改模板的样式文件，在 Terre 中使用时似乎还需要修改 Terre 那边的模板的样式才能让已读文本展示相应的颜色，相关文件为 WebGAL_Classic/Stage/TextBox/textbox.scss