feat(lazyload): drop Options API to support disabling __VUE_OPTIONS_API__ by Copilot

[yoyo837]

将剩余使用选项式API的组件改为组合式API，以支持在编译时安全的关闭__VUE_OPTIONS_API__

[gemini-code-assist]

Summary of Changes

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This pull request focuses on modernizing the lazy-image and lazy-component implementations within the vant lazyload package. By transitioning these components from the Options API to the Composition API, the project can benefit from enhanced tree-shaking capabilities during the build process. This refactoring is a step towards optimizing the application's performance and reducing its overall bundle size by allowing the Vue Options API to be safely excluded if not used elsewhere.

Highlights

• Composition API Migration: The lazy-component and lazy-image modules have been refactored from Vue's Options API to the Composition API.
• Compile-time Optimization: This migration enables the safe disabling of the __VUE_OPTIONS_API__ flag during compilation, which can lead to improved bundle size and performance.
• Code Modernization: The changes align these components with modern Vue 3 development practices, improving maintainability and readability.

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Changelog

• packages/vant/src/lazyload/vue-lazyload/lazy-component.js
  • Refactored the component to utilize Vue 3's Composition API.
  • Replaced data properties with ref and reactive for state management.
  • Migrated lifecycle hooks (mounted, beforeUnmount) to onMounted and onBeforeUnmount.
  • Converted component methods (checkInView, load, destroy) into functions within the setup block.
• packages/vant/src/lazyload/vue-lazyload/lazy-image.js
  • Migrated the image lazy-loading component to the Vue 3 Composition API.
  • Replaced data properties with ref and reactive for state management.
  • Converted the watch option to the watch function from Vue's reactivity API.
  • Refactored created, mounted, and beforeUnmount hooks into setup logic, onMounted, and onBeforeUnmount respectively.
  • Moved component methods (init, checkInView, load) into the setup function.

Activity

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[gemini-code-assist]

Code Review

此 PR 将 lazy-image 和 lazy-component 从选项式 API 重构为了组合式 API。这次重构实现得很好，正确地遵循了组合式 API 的模式。这次迁移是向着能够禁用选项式 API 以获得更好性能和更小打包体积迈出的良好一步。我在 lazy-image.js 中发现一个潜在问题，即每次 src 属性变更时，组件都会被重新添加到 lazy-load 管理器中，这可能导致内存泄漏。我已留下具体的评论和修复建议。总的来说，这次重构工作做得很好。

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.91%. Comparing base (ec5b45b) to head (12d4f87).
⚠️ Report is 212 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #13786      +/-   ##
==========================================
+ Coverage   89.60%   89.91%   +0.31%     
==========================================
  Files         257      257              
  Lines        7013     7063      +50     
  Branches     1736     1755      +19     
==========================================
+ Hits         6284     6351      +67     
+ Misses        384      375       -9     
+ Partials      345      337       -8     

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