fix(ui): 修复 MyListItem 选中时动画条的高度问题

[MinecraftYJQ]

旧	新

让他的高度能够固定。在旧版，默认的高度和选中的高度不一致

Summary by Sourcery

修复并统一 MyListItem 选中指示条的视觉行为，确保其具有一致的固定高度，并提供更流畅的显示/隐藏动画。

Bug 修复：

• 确保 MyListItem 左侧选中指示条在正常和选中状态之间保持一致的固定高度。

增强优化：

• 通过切换为居中的缩放变换来改进选中指示条的动画效果，从而获得更平滑的展开/收起动画以及更一致的对齐方式。

Original summary in English

Summary by Sourcery

Fix and standardize the visual behavior of the MyListItem selection indicator bar, ensuring a consistent fixed height and smoother show/hide animation.

Bug Fixes:

• Ensure the MyListItem left selection indicator keeps a consistent fixed height between normal and selected states.

Enhancements:

• Improve the selection indicator animation by switching to a centered scale transform for smoother expand/collapse effects and consistent alignment.

[sourcery-ai]

审阅者指南

此 PR 通过用基于缩放变换的动画替换基于高度的动画，并在所有选中/未选中状态下为左侧“神秘”选择条设置固定且居中的高度，修复了 MyListItem 中左侧选择条视觉高度不一致的问题。

文件级变更

变更	细节	文件
当切换选中状态时，统一 MyListItem 中左侧选择条的视觉高度和动画行为。	引入一个可配置常量（customHeight = 20d），并将其作为选择条的固定高度，而不是依赖动态/自动高度和基于 ActualHeight 的动画。 将 RectCheck 上原先改变高度的动画替换为基于 ScaleTransform 的 ScaleY 动画（选中时 0→1，取消选中时从当前值→0），同时将 RenderTransformOrigin 设置为中心以保证缩放的一致性。 在选中状态下（固定高度、垂直居中对齐、上下边距为 0、不透明度为 1）和未选中状态下（高度为 0、不透明度为 0、居中、清除变换）规范 RectCheck 的静态布局属性，以消除视觉高度差异。 简化并现代化 RectCheck 的空值检查（使用 RectCheck != null），并在需要进行动画之前确保 RenderTransform 已初始化为 ScaleTransform。	Plain Craft Launcher 2/Controls/MyListItem.xaml.cs

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Original review guide in English

Reviewer's Guide

This PR fixes the visual height inconsistency of the left "mystery" selection bar in MyListItem by replacing height-based animations with scale-transform based animations and enforcing a fixed, centered height for the bar in all checked/unchecked states.

File-Level Changes

Change	Details	Files
Unify the visual height and animation behavior of the left selection bar in MyListItem when toggling checked state.	Introduce a configurable constant (customHeight = 20d) and use it as the fixed height for the selection bar instead of relying on dynamic/auto height and ActualHeight-based animations. Replace previous height-changing animations on RectCheck with ScaleTransform-based animations on ScaleY (0→1 on check, current→0 on uncheck) while setting RenderTransformOrigin to the center for consistent scaling. Normalize RectCheck static layout properties in the checked state (fixed height, center vertical alignment, zero top/bottom margin, full opacity) and in the unchecked state (height 0, opacity 0, centered, cleared transform) to remove the visual height discrepancy. Simplify and modernize null checks on RectCheck (using RectCheck != null) and ensure RenderTransform is initialized to a ScaleTransform when needed before animating.	Plain Craft Launcher 2/Controls/MyListItem.xaml.cs

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[sourcery-ai]

Hey - 我在这里给出了一些总体反馈：

• 新的动画逻辑会无条件地将 RectCheck.RenderTransform 覆盖为一个 ScaleTransform（之后再将其重置为 null），这可能会与其他期望使用不同变换的调用方产生冲突；建议考虑在现有变换的基础上进行组合，或者在替换前先保存之前的变换并在结束后恢复，而不是直接替换。
• customHeight、持续时间数值（例如 300、120、70）以及缓动函数的选择目前在多个位置被硬编码；建议将这些提取为具名常量或共享配置，这样可以更容易地调整动画行为并保持一致性。

面向 AI 代理的提示

Please address the comments from this code review:

## Overall Comments
- The new animation logic unconditionally overwrites `RectCheck.RenderTransform` with a `ScaleTransform` (and later resets it to `null`), which may conflict with other callers that expect a different transform; consider composing with an existing transform or storing and restoring the previous transform instead of replacing it.
- The `customHeight`, duration values (e.g. `300`, `120`, `70`), and easing choices are currently hard-coded in multiple places; extracting these into named constants or a shared configuration would make the animation behavior easier to tweak and keep consistent.

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Original comment in English

Hey - I've left some high level feedback:

• The new animation logic unconditionally overwrites RectCheck.RenderTransform with a ScaleTransform (and later resets it to null), which may conflict with other callers that expect a different transform; consider composing with an existing transform or storing and restoring the previous transform instead of replacing it.
• The customHeight, duration values (e.g. 300, 120, 70), and easing choices are currently hard-coded in multiple places; extracting these into named constants or a shared configuration would make the animation behavior easier to tweak and keep consistent.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- The new animation logic unconditionally overwrites `RectCheck.RenderTransform` with a `ScaleTransform` (and later resets it to `null`), which may conflict with other callers that expect a different transform; consider composing with an existing transform or storing and restoring the previous transform instead of replacing it.
- The `customHeight`, duration values (e.g. `300`, `120`, `70`), and easing choices are currently hard-coded in multiple places; extracting these into named constants or a shared configuration would make the animation behavior easier to tweak and keep consistent.

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