⚡ Bolt: 移除不必要的 Color 内存装箱 (微重构)

[Shangjin-Xiao]

💡 内容: 移除了 VideoSurface.kt 中围绕 Color.copy(alpha = ...) 调用的 remember 块。因为 Color 是一个包裹了 ULong 的 value class，使用 remember 会强制在 Compose slot table 中发生装箱（boxing），从而导致额外的堆内存分配。

🎯 原因: Color.copy() 仅仅是进行轻量级的位运算。如果不使用 remember，每次重组时只会在栈上进行数学运算，速度极快且不会产生垃圾回收压力。使用 remember 反而导致了微观劣化（micro-pessimization），降低了性能。

📊 影响: 减少了在诸如视频滑动或调整缩放等频繁重组过程中的不必要内存分配（对象装箱），从而降低了 GC 的频率，使滑动更加流畅。

🔬 测量: 通过 Android Studio Profiler 的 Memory Allocation 跟踪可以观察到重组期间装箱对象的分配减少。同时，单元测试和编译能够无误通过。

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PR created automatically by Jules for task 1654909983758541249 started by @Shangjin-Xiao

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Summary by cubic

Removes unnecessary remember blocks around Color.copy() calls in VideoSurface.kt. Because Color is a value class, memoizing it forces boxing and heap allocation during recomposition; the bitwise copy() is cheap, so removing remember reduces GC pressure and makes frequent recompositions smoother.

^{Written for commit a95465f. Summary will update on new commits.}

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