fix: add fold-code button when code is expand

[code-october]

💻 变更类型 | Change Type

• [ ] feat
• [x] fix
• [ ] refactor
• [ ] perf
• [ ] style
• [ ] test
• [ ] docs
• [ ] ci
• [ ] chore
• [ ] build

🔀 变更说明 | Description of Change

Add a collapse code button when expanding the code to support toggling the code's collapsed state at any time.

📝 补充信息 | Additional Information

Relevant issue：https://github.com/ChatGPTNextWeb/ChatGPT-Next-Web/issues/5284

Summary by CodeRabbit

• New Features

  • Simplified toggle button for content visibility, now showing "More" or "Less" based on state.
  • Added localization support for the toggle button in English, Simplified Chinese, and Traditional Chinese.

• Style

  • Enhanced layout behavior for expanded content with updated alignment properties.

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[coderabbitai[bot]]

Walkthrough

The changes involve updates to the rendering logic of the CustomCode component in the app/components/markdown.tsx file, specifically regarding a toggle button for content visibility. The button's display condition has been simplified, and new localization entries have been added for different languages. Additionally, CSS modifications enhance the layout of the .expanded class, improving content alignment.

Changes

Files	Change Summary
app/components/markdown.tsx	Updated CustomCode function to simplify toggle button rendering logic and dynamically update text.
app/locales/cn.ts	Added Less: "折叠代码" for localization support in Chinese.
app/locales/en.ts	Added Less: "Fold Code" for localization support in English.
app/locales/tw.ts	Added Less: "收合程式" for localization support in Traditional Chinese.
app/styles/globals.scss	Modified .expanded class to set justify-content: flex-end for improved layout behavior.

Possibly related PRs

• #5303: Modifies the CustomCode component to change button text to a dynamic value, related to the toggle button rendering logic.
• #5377: Adds an optional className property to the CustomCode function, enhancing styling flexibility relevant to the rendering logic changes.
• #5495: Alters the onClick event handler in the PreCode component, changing how text is copied to the clipboard, related to the functionality of components in the main PR.

Suggested reviewers

• lloydzhou

🐰 In the meadow, the code does play,
With toggles that dance, come what may.
"More" and "Less" in harmony sing,
Localization brings a joyful spring.
Aligning content, a neat little feat,
Hop along, changes make it sweet! 🌼

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[github-actions[bot]]

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[lloydzhou]

查看全部在顶部，居中。 所以，折叠收起，应该在底部居中，应该同样有一个遮罩层，只是颜色渐变是相反的。

[Issues-translate-bot]

Bot detected the issue body's language is not English, translate it automatically.

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See all at the top, centered. So, folded, it should be centered at the bottom, and it should also have a mask layer, just with the color gradient reversed.

[code-october]

@lloydzhou 我移动到右上角，主要是担心提示文字居中会遮挡代码，影响阅读代码观感，这再加上遮罩，感觉观感更差了 ？

[Issues-translate-bot]

Bot detected the issue body's language is not English, translate it automatically.

---

I moved it to the upper right corner, mainly because I was worried that the centering of the prompt text would block the code and affect the look and feel of reading the code. Coupled with the mask, the look and feel would be worse?