Xiaomi Chrome keeps 100dvh at the large-viewport size while the URL bar
overlays the page, so the shell's 100dvh min-height left the document one
bar-height taller than the screen (scrollable + a strip under the
composer). The immersive route now sizes the document to exactly 100svh
with hidden overflow down the chain — body scroll is impossible regardless
of the browser's dvh interpretation. Other routes unchanged.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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