fix: preserve null unions in setFieldsValue types

[QDyanbing]

变更说明

• 修复 RecursivePartial 对 null 联合类型的错误收窄，使 setFieldsValue 能正确接受 数组 | null 类型的字段
• 保留历史上的类型行为，确保可选父字段下的递归 partial 能力不受影响
• 补充类型回归测试，覆盖 null 联合场景以及之前可选嵌套字段的 partial 场景

验证

• npm run lint:tsc

fix ant-design/ant-design#57707

[vercel]

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[coderabbitai]

总体概述

此PR修改了 RecursivePartial<T> 类型的实现逻辑，简化了对数组和对象的递归偏选处理，同时扩展了相关的编译时类型检查测试覆盖范围。

改动一览

类型/文件(s)	改动摘要
类型定义重构 src/interface.ts	修改了 RecursivePartial<T> 的类型检查逻辑：移除了 NonNullable<T> 的中间层处理，直接检查数组和对象类型，通过 RecursivePartial<U>[] 处理数组元素，对象属性值进行递归偏选。
编译时类型检查扩展 tests/nameTypeCheck.test.tsx	添加了 FormInstance 导入，扩展了 FieldType 类型定义（新增 strictList、user、nullableList、nullableObjectList 等字段），引入 SetFieldsValueParam 类型及多个覆盖空值、数组和嵌套对象等场景的常量。

代码审查估计

🎯 3 (中等) | ⏱️ ~20 分钟

建议审查者

• zombieJ

兔兔之歌

🐰 类型的魔法更精妙，
递归层次更简洁，
数组对象无烦恼，
测试覆盖添新彩，
TypeScript的世界真美妙！ ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	标题准确反映了本次变更的核心目标，即在setFieldsValue类型中保留null联合类型，使其能够接受数组或null类型的字段。
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.54%. Comparing base (713c103) to head (570c0b6).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #781   +/-   ##
=======================================
  Coverage   99.54%   99.54%           
=======================================
  Files          20       20           
  Lines        1328     1328           
  Branches      329      329           
=======================================
  Hits         1322     1322           
  Misses          6        6           

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[gemini-code-assist]

Code Review

This pull request refactors the RecursivePartial utility type to simplify its structure and adds comprehensive test cases for nullable lists and nested optional objects. A suggestion was made to update the array check to support readonly types, preventing immutable arrays from being incorrectly processed as objects.