chore(sync): merge upstream

[Chloemlla]

Automated upstream sync by fork-sync.

• Parent: zly2006 master
• Base: Chloemlla/zhihu-plus-plus master

If this PR has conflicts, please resolve manually. Clean PRs are auto-merged.

Summary by CodeRabbit

• 新功能

  • 超过 4096 个字符的长公式现在会自动以独立的块级公式形式显示。

• 改进

  • 短公式继续根据原有规则以内联公式或块级公式形式呈现。

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: 45cd35b2-a800-4188-ae9c-6e2d83bae5e1

📥 Commits

Reviewing files that changed from the base of the PR and between 60a5ca6 and d9319ac.

📒 Files selected for processing (1)

• shared/src/commonMain/kotlin/com/github/zly2006/zhihu/markdown/MdAst.kt

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📝 Walkthrough

Walkthrough

Changes

公式节点分类

Layer / File(s)	Summary
公式长度路由 shared/src/commonMain/kotlin/com/github/zly2006/zhihu/markdown/MdAst.kt	新增 OVERLONG_FORMULA_SOURCE_LIMIT = 4096。当公式来源长度超过 4096 个字符时，extractEquationNode 返回 MathBlock。其他非显示公式继续返回 InlineMath。

Estimated code review effort: 1 (简单) | ~5 分钟

Suggested reviewers: zly2006, 123duo3

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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