The COD-39 attachment-history header button was visible on the cramped
phone header. Hide it on phones alongside the settings gear and lifecycle
log (the mobile header is intentionally minimal — those controls live in
the toolbar). One-line addition to the existing @media (max-width: 430px)
display:none block in mobile.css.
This is the second time a header control leaked onto mobile (the
plan-usage chip was the first), so add two regression guards:
- test/mobile-header-buttons-policy.test.ts — a pure static analysis of
index.html + mobile.css (no browser), so it runs in the normal CI sweep
(the test/mobile/** Playwright suite is EXCLUDED from CI and never gated
this). It enumerates every default-visible header button and fails when
one has no phone-visibility decision — either a mobile.css hide rule or
an explicit MOBILE_VISIBLE_ALLOWLIST entry. A new header button now
forces that decision. Verified it fails on the pre-fix state and passes
after.
- test/mobile/header-buttons.test.ts — real-browser E2E in the mobile
suite: asserts the attachments/settings/lifecycle buttons are hidden on
an emulated iPhone 14 Pro and the attachments button is visible on a
desktop-class tablet.
tsc + lint + prettier + both new tests green. Only CSS + tests changed.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>