Render virtual channels as absolutely-positioned layer strips inside a
shared relative container (#vchan-freq-layers). Layers are sorted by
frequency ascending so higher-frequency channels receive a higher z-index
and sit on top by default. Hovering any layer temporarily assigns it the
maximum z-index to bring it to the front; leaving restores the original
stacking order. Each layer is offset by 11 px vertically so all channels
remain visible as a staggered card stack.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Signed-off-by: Stan Grams <sjg@haxx.space>
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