fix: 🐛 修复input、textarea组件placeholder样式在微信小程序无效的问题

[RJQingHuan]

✅ Closes: #943

🤔 这个 PR 的性质是？(至少选择一个)

• 日常 bug 修复
• 新特性提交
• 站点、文档改进
• 演示代码改进
• 组件样式/交互改进
• TypeScript 定义更新
• CI/CD 改进
• 包体积优化
• 性能优化
• 功能增强
• 国际化改进
• 代码重构
• 代码风格优化
• 测试用例
• 分支合并
• 其他改动（是关于什么的改动？）

🔗 相关 Issue

💡 需求背景和解决方案

☑️ 请求合并前的自查清单

⚠️ 请自检并全部勾选全部选项。⚠️

• 文档已补充或无须补充
• 代码演示已提供或无须提供
• TypeScript 定义已补充或无须补充

Summary by CodeRabbit

• 新增功能

  • 升级了输入框和文本域的占位符样式，以提供更统一、清晰的视觉体验，尤其在暗黑模式与错误状态下展现更佳效果。

• 代码优化

  • 对样式部分进行微调和整理，提升整体代码整洁度和维护性。

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[coderabbitai]

Walkthrough

此次变更主要针对 wot-design-uni 组件中输入框（wd-input）和文本区域（wd-textarea）的占位符样式。原有的 SCSS 文件中通过 @include e(placeholder) mixin 定义的占位符样式被移除，并引入了新的 placeholder.scss 文件，以统一管理占位符的默认、暗黑主题以及错误状态下的样式。此外，在相应的 Vue 组件中新增样式块以导入新的占位符样式文件，同时进行了一处格式化调整。

Changes

文件路径	更改摘要
src/.../wd-input/index.scss src/.../wd-textarea/index.scss	移除了原有的 @include e(placeholder) mixin 调用，删除了输入框与文本区域中用于占位符样式的代码；其中 wd-input/index.scss 还移除了末尾多余的换行符。
src/.../wd-input/placeholder.scss src/.../wd-textarea/placeholder.scss	新增独立的 SCSS 文件，用于定义占位符的默认样式、暗黑主题变体及错误状态下的颜色设置，保证样式的一致性。
src/.../wd-input/wd-input.vue src/.../wd-textarea/wd-textarea.vue	在 Vue 组件中新增 <style> 块以引入新的 placeholder.scss 样式文件，扩展组件的占位符样式配置（wd-input.vue 使用 scoped 样式，而 wd-textarea.vue 则为非 scoped 样式）。

Possibly related PRs

• refactor: ♻️ 移除Textarea和Input的change事件和useXXSlot开启插槽的逻辑 #893: 修改占位符样式处理，通过移除旧 mixin 和新增 SCSS 文件实现占位符样式的优化。
• fix: 🐛 修复Textarea的placeholder无法设置空字符串问题 #472: 调整 wd-textarea 组件中占位符的错误状态颜色设置，影响了占位符的视觉呈现。

Suggested reviewers

• Moonofweisheng

Poem

我是一只跳跃的小兔子，
在代码的田野中欢快徜徉，
占位符的变更如春风拂面，
每一处改动都如此温柔，
错误与明亮在这里齐舞，
愿代码世界充满跳跃的希望！ 🐇

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📜 Recent review details

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📥 Commits

Reviewing files that changed from the base of the PR and between 7478939 and 1c385f2.

📒 Files selected for processing (6)

• src/uni_modules/wot-design-uni/components/wd-input/index.scss (1 hunks)
• src/uni_modules/wot-design-uni/components/wd-input/placeholder.scss (1 hunks)
• src/uni_modules/wot-design-uni/components/wd-input/wd-input.vue (1 hunks)
• src/uni_modules/wot-design-uni/components/wd-textarea/index.scss (0 hunks)
• src/uni_modules/wot-design-uni/components/wd-textarea/placeholder.scss (1 hunks)
• src/uni_modules/wot-design-uni/components/wd-textarea/wd-textarea.vue (1 hunks)

💤 Files with no reviewable changes (1)

• src/uni_modules/wot-design-uni/components/wd-textarea/index.scss

🔇 Additional comments (5)

src/uni_modules/wot-design-uni/components/wd-textarea/wd-textarea.vue (1)

286-289: 新增样式块导入 placeholder.scss
在此处新增的 <style> 块用于引入 placeholder.scss，确保文本域占位符在微信小程序中能正确显示。这种做法将占位符样式从原有的 index.scss 中剥离出来，符合模块化及样式统一管理的设计原则。

src/uni_modules/wot-design-uni/components/wd-input/wd-input.vue (1)

296-298: 新增样式块导入 placeholder.scss
通过添加新的 <style> 块引入 placeholder.scss，输入框的占位符样式将从原先散落的 mixin 定义中分离出来，统一由单独的 SCSS 文件管理，从而修复微信小程序中 placeholder 样式失效的问题。

src/uni_modules/wot-design-uni/components/wd-textarea/placeholder.scss (1)

1-21: 新增文本域占位符样式文件
此文件清晰地定义了文本域的占位符样式，包括默认状态、暗黑主题及错误状态下的样式。通过引用公共变量和 mixin，保证了样式的一致性与可维护性。检查路径和变量是否与项目统一规范，整体实现符合预期。

src/uni_modules/wot-design-uni/components/wd-input/placeholder.scss (1)

1-22: 新增输入框占位符样式文件
此 SCSS 文件为输入框定义了默认、暗黑主题和错误状态下的占位符样式。结构上采用了 BEM 命名和 mixin，保证了与设计系统其他组件风格的一致性。建议确认引入的公共变量与 mixin 均符合最新规范，整体实现良好。

src/uni_modules/wot-design-uni/components/wd-input/index.scss (1)

324-324: 移除占位符样式 mixin 的调整
已将原先在 index.scss 中通过 @include e(placeholder) 定义的占位符样式移除，将该部分样式拆分到新的 placeholder.scss 文件中管理。此改动符合整体样式统一的策略，请确保在各个状态（如错误、暗黑）下占位符样式能够正常显示，建议在微信小程序环境中进行全面验证。

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