Sidebar resize without a visible pill
侧边栏缩放不显示胶囊
The AppFrame exposed identical floating pills on both column borders. The left pill added unnecessary visual weight beside primary navigation, but the sidebar's resize interaction remains useful.
English
Problem
The AppFrame exposed identical floating pills on both column borders. The left pill added unnecessary visual weight beside primary navigation, but the sidebar's resize interaction remains useful.
Decision
AppFrame keeps the sidebar's 8px resize hit strip, col-resize cursor, pointer capture, animation-frame throttling, and width updates, but does not generate the sidebar handle's pill pseudo-element. The details boundary retains both its hit strip and floating pill.
The layout component test continues to pin sidebar dragging and both handles' collapse lifecycle. A keyless browser scenario reads the generated pseudo-elements from the shipped composition and drags the invisible sidebar boundary to prove the interaction remains live.
Alternatives considered
Remove the sidebar drag interaction with the pill. Rejected because the requested change is visual; removing a working geometry control would unnecessarily narrow the interaction.
Keep the pill but reduce its emphasis. A smaller or lower-contrast pill still leaves an unwanted object on the sidebar boundary.
Consequences
The sidebar boundary is visually quiet while pointer resizing remains available from the boundary and retains the resize cursor. Unlike the details control, that interaction has no visible pill.
中文
问题
AppFrame 在两个栏位边界都显示相同的浮动胶囊。左侧胶囊在主导航旁增加了不必要的视觉负担，但侧边栏的缩放交互仍有用。
决策
AppFrame 保留侧边栏宽 8px 的缩放命中条带、col-resize 光标、指针捕获、动画帧节流和宽度更新，但不再生成侧边栏手柄的胶囊形伪元素。详情栏边界同时保留命中条带和浮动胶囊。
布局组件测试继续固定侧边栏拖动行为，以及两个手柄随面板折叠时的生命周期。一个无密钥浏览器场景读取实际交付组合所生成的伪元素，并拖动不可见的侧边栏边界，证明该交互仍然有效。
曾考虑的替代方案
随胶囊一并移除侧边栏拖动交互。 不予采纳，因为本次要求只改视觉表现；移除正常工作的几何控制会不必要地缩减交互方式。
保留胶囊，但降低其视觉强调。 更小或对比度更低的胶囊仍会在侧边栏边界留下一个不需要的物体。
后果
侧边栏边界在视觉上保持简洁，同时仍可在边界处通过指针调整宽度，并保留缩放光标。与详情栏控件不同，该交互没有可见胶囊。