The COD-39 attachments button was hard-visible in the header — first on
mobile, then (after the mobile-only hide) still on desktop. Make it a
proper opt-in App Settings → Display toggle ("Attachments Button"),
default OFF everywhere, mirroring the Response Viewer button:
- index.html: button ships with the `btn-attachments-history--hidden`
marker; new settings checkbox #appSettingsShowAttachmentsButton.
- styles.css: base `display:inline-flex !important` + a more-specific
`--hidden` rule (same pattern as the response viewer).
- settings-ui.js: load/save/getDefaultSettings(false) + a live toggle in
applyHeaderVisibilitySettings. Per-device and NON-leaking — added to
displayKeys AND stripped from the server payload, so enabling it on
desktop never makes it appear on mobile (or any other device). No
server-side render step (purely client display, like the eye button).
- mobile.css: dropped the now-redundant phone-only hide — the opt-in
marker hides it everywhere by default; the per-device toggle governs
both desktop and phone.
Tests updated: the CI static guard drops btn-attachments-history from the
phone-hidden lock (it's opt-in now, excluded from the default-visible
enumeration — the guard still gates any NEW default-visible button); the
real-browser E2E now asserts default-hidden on a desktop-class viewport
and visible after enabling the setting.
Verified on a real desktop browser: hidden by default, the settings
toggle exists, enabling it shows the button. tsc + frontend-syntax +
prettier + public-asset checks + both test suites green.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude (Codeman maintainer)
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