fix(countdown): 个位秒补0展示

[irisSong]

🤔 这个变动的性质是？

• 新特性提交
• 日常 bug 修复
• 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
• 包体积优化
• 性能优化
• 功能增强
• 国际化改进
• 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

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⚠️ 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
• fork仓库代码是否为最新避免文件冲突
• Files changed 没有 package.json lock 等无关文件

Summary by CodeRabbit

• Bug Fixes
  • 调整了倒计时显示逻辑，在秒格式显示时即使缺少单位也能正确补零，确保倒计时数字显示更加准确与一致。

[coderabbitai]

Walkthrough

此变更修改了 InternalCountDown 组件中 renderTimeItem 函数的条件逻辑。原有逻辑只在 unit 定义且不为 'DD' 时调用 padZero，现新增了当 unit 未定义且 formatUnit 为 'ss' 时也调用 padZero。该修改仅影响时间格式化显示逻辑，公共接口未作调整。

Changes

文件	修改概要
src/.../countdown.taro.tsx	修改了 renderTimeItem 条件逻辑，新增了在 unit 未定义且 formatUnit 为 'ss' 时调用 padZero 的判断。

Sequence Diagram(s)

sequenceDiagram
    participant Countdown as InternalCountDown
    participant TimeItem as renderTimeItem
    participant Formatter as padZero
    Countdown->>TimeItem: 调用 renderTimeItem(time, unit, formatUnit)
    alt unit 存在且 != 'DD'
        TimeItem->>Formatter: 调用 padZero(time)
        Formatter-->>TimeItem: 返回格式化时间
    else unit 未定义且 formatUnit == 'ss'
        TimeItem->>Formatter: 调用 padZero(time)
        Formatter-->>TimeItem: 返回格式化时间
    else
        TimeItem-->>Countdown: 返回原始 time
    end

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Possibly related PRs

• fix(countdown): taro不区分四端实现方式 #2396: 修改了 renderTimeItem 的逻辑，同时移除了 renderTime 函数，实现了组件结构的简化。
• fix(countdown): update the v15 style #2843: 针对 countdown.taro.tsx 文件对倒计时组件的渲染逻辑进行了相关处理。

Suggested reviewers

• xiaoyatong
• oasis-cloud

Poem

我是一只快乐的兔子，
跳跃在代码的草原上，
数字变幻中见奇妙，
零填点亮了时光，
我吟唱着代码的诗行！
代码世界，从此生光！

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📥 Commits

Reviewing files that changed from the base of the PR and between 40edc03 and 5fd0d52.

📒 Files selected for processing (1)

• src/packages/countdown/countdown.taro.tsx (1 hunks)

⏰ Context from checks skipped due to timeout of 90000ms (1)

• GitHub Check: test

🔇 Additional comments (1)

src/packages/countdown/countdown.taro.tsx (1)

284-286: 修复了秒数的零补齐显示逻辑

修改后的条件表达式很好地解决了单位数秒数不显示前导零的问题。现在不仅在有单位且单位不为'DD'的情况下会补零，还在没有单位但格式单位为'ss'（秒）的情况下也会补零，确保了秒数始终以两位数字的形式显示（例如"05"而不是"5"）。

这个修复与PR标题"个位秒补0展示"的目标一致，改进了倒计时组件的显示一致性。

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.10%. Comparing base (40edc03) to head (5fd0d52).
Report is 2 commits behind head on feat_v3.x.

Additional details and impacted files

@@            Coverage Diff             @@
##           feat_v3.x    #3072   +/-   ##
==========================================
  Coverage      86.10%   86.10%           
==========================================
  Files            277      277           
  Lines          18406    18406           
  Branches        2807     2808    +1     
==========================================
  Hits           15849    15849           
  Misses          2552     2552           
  Partials           5        5           

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