fix(calendar): fix modelValue prop not working

[ah-smile]

Types of changes

• New feature
• Bug fix
• Enhancement
• Component style change
• Typescript definition change
• Documentation change
• Coding style change
• Refactoring
• Test cases
• Continuous integration
• Breaking change
• Others

Background and context

Calendar 组件在v-model、modelValue值改变时日历面板不会更新

Solution

问题：初始化时使用了一个新的变量 pageShowDate 渲染日历面板导致外层响应式丢失
解决方案：watch监听 modelValue 值变化时重新赋值给 pageShowDate

How is the change tested?

新增 Calendar 组件 modelValue 属性响应式相关单元测试
修复前：改变 modelValue 值日历面板未更新

修复后：单元测试通过，功能正常

Changelog

Component	Changelog(CN)	Changelog(EN)	Related issues
Calendar	修复 modelValue 属性丢失响应式bug	fix modelValue prop not working

Checklist:

• Test suite passes (npm run test)
• Provide changelog for relevant changes (e.g. bug fixes and new features) if applicable.
• Changes are submitted to the appropriate branch (e.g. features should be submitted to feature branch and others
  should be submitted to main branch)

Other information

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