The shortcut chip is desktop-only

[DelanoJoey]

showShortcut had no viewport guard, so the ⌘K / Ctrl K chip rendered at rest on phones — advertising a keyboard shortcut to a device with no keyboard, and charging ~55px of the input's visible width for it.

That width is not cosmetic

An expert-panel round on a consumer site measured the at-rest text budget on a 390px screen at ~169px with the chip present. The site's placeholder rendered as:

Ask how the model w

Clipped mid-word, second clause gone entirely. The chip was ~55px of that shortfall.

isMac compounds it — it reads navigator.platform, so a touch device can render the wrong modifier for a shortcut it cannot press either way.

The fix

Guarded on the same 767px breakpoint the footer-collision check already uses, so the two agree about what "mobile" means.

Held as state set from an effect, not derived inline from matchMedia — the inline form hydrate-mismatches (server sees no window, renders the chip; client hides it). That is exactly why isMac is shaped this way, and the new state follows it. A change listener keeps it correct across rotation.

Tests

test
shown on a wide viewport
hidden below 768px
the freed width reaches the input	the property that motivated the change

Mutation: dropping && !isNarrow fails 2 of 3.

Suite 45/45 (3 new) · typecheck clean · version 1.4.1 → 1.4.2.

Publishing is tag-triggered, so merging this does not release it.

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