Measured at the reference device's 424x439, every button here was
33x21px -- in the bottom bar and on the full-screen view alike. #56
reports them as "the most important thing in the mobile app and they
are tiny", and that is the number behind it.
The context is a **property, not a media query**, and that is the whole
design. Everywhere else in this app a component states what it drops at
phone width itself, because a media query inside a shadow root is
answered by the viewport and that is the honest signal. Here the two
hosts want different answers at the *same* viewport: on a phone the bar
wants three controls sized for a thumb and now-playing-view wants five,
larger still. So the host says which context and the viewport says
which size band, and neither alone can express it.
Play/pause alone goes above the 44px floor. A row of five identical
squares says every action is equally likely, which is not true of play
-- "large play/pause, adequate prev/next" is the Direction, and a spec
caught that the first version had sized all three the same.
Two things that fail silently:
The desktop bar must not move, and a `<button>` does not inherit its
font from its parent -- the UA stylesheet gives it one. So a generic
`font-size: inherit` is not the no-op it reads as: it took every
desktop control from 33x21 to 36x24. The box rules take a zero fallback
and the font-size rules are scoped to the two contexts that set one.
And the art on now-playing-view overflowed its own box, drawing over
the header above and the title below, because `aspect-ratio: 1` with a
definite width derives a height that nothing bounds -- 60vh bounds the
viewport, not the room left over. `max-height: 100%`. Pre-existing;
found by reading a screenshot, which is the only tier that can see it.
What is left is #172: with the transport at 172px of a 439px screen the
art is a 39px sliver.
Closes#56
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