The credit fold was guarded by uiStore.isMobile, which only uiStore.init()
sets; a host that never calls it (UPG-100's map) kept the credit expanded.
The fold now tests the phone breakpoint itself, with the phone CSS block's
own query.
A finger aimed at the open sheet's top edge often landed on the hint pill
just above it, and a drag there scrolled the pane instead of resizing the
sheet. A transparent 12px lip above the open sheet takes that gesture with
the sheet's own handlers (their grab zone is measured from the sheet's top),
above the pill; it exists only while the sheet is open.
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