refactor: enhance export functions

[GeorgeDong32]

What this PR does

• [x] 为Obsidian、Joplin添加思维链导出支持
• [x] 修复Obsidian导出弹窗与应用风格、主题不一致的问题
• [ ] 为Notion、语雀添加思维链导出支持（咕了，暂时没想好怎么做）
• [x] 支持导出时包含模型名称
• [ ] 修复Notion导出时超过API Limit的导致导出失败的问题(弃用简单分页)（咕了，下个pr再做）

  

相关issue

• #5817
• #5757

Why we need it and why it was done in this way

• 所有本质为Markdown的导出选项全部经统一的接口处理，提高复用性和可维护性

Breaking changes

None

Special notes for your reviewer

Checklist

This checklist is not enforcing, but it's a reminder of items that could be relevant to every PR. Approvers are expected to review this list.

• [ ] PR: The PR description is expressive enough and will help future contributors
• [x] Code: Write code that humans can understand and Keep it simple
• [x] Refactor: You have left the code cleaner than you found it (Boy Scout Rule)
• [ ] Upgrade: Impact of this change on upgrade flows was considered and addressed if required
• [x] Documentation: A user-guide update was considered and is present (link) or not required. You want a user-guide update if it's a user facing feature.

Release note

Summary by Sourcery

Introduce a configurable setting to display the model name in exported markdown messages, updating export utilities and settings interface accordingly.

New Features:

• Add option to include model name in exported markdown messages.

Enhancements:

• Update export functions and settings UI to support toggling model name display in markdown exports.

[sourcery-ai[bot]]

Reviewer's Guide

This PR refactors and enhances the export functions by adding an option to include the model name in exported markdown, updating the settings UI and store to support this feature, and adjusting the markdown export logic accordingly.

File-Level Changes

Change	Details	Files
Added support for including model name in exported markdown messages.	Extended export functions to optionally append model name to assistant messages if enabled in settings. Updated messageToMarkdown and messageToMarkdownWithReasoning to use new setting.	src/renderer/src/utils/export.ts
Introduced a new setting to control model name display in markdown exports.	Added showModelNameInMarkdown to settings state and initial state. Created setShowModelNameInMarkdown action and reducer in settings slice.	src/renderer/src/store/settings.ts
Updated settings UI to allow toggling model name display in markdown exports.	Added switch and help text for showModelNameInMarkdown in MarkdownExportSettings UI. Connected UI to new setting and dispatch action on toggle.	src/renderer/src/pages/settings/DataSettings/MarkdownExportSettings.tsx

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[GeorgeDong32]

@sourcery-ai review

[tenfyzhong]

这个pr有计划什么时候合入吗？

[GeorgeDong32]

这个pr有计划什么时候合入吗？

应该还要过两天，刚发现有点bug之前没测出来

[Pleasurecruise]

#5757 好像没有实现 在 🤖 Assistant 旁附带一下就可以

[GeorgeDong32]

#5757 好像没有实现 在 🤖 Assistant 旁附带一下就可以

markdown设置里要开显示模型名称，没有的话可能开关逻辑有问题，我稍后看一下

[Pleasurecruise]

哦哦 不好意思没看见 好像没问题了 先合并了