wiki: Clear all is a header action
wiki: the mask control toggles both ways
wiki: how a message is copied and hidden now
wiki: sync v0.17.1 — copy, hide, and the phone follow-ups Publishes docs/wiki as merged: the new Working-with-messages page, the local-first save policy and the phone Files dialog, hidden-is-not-encryption, the browser Open troubleshooting entry, and the #470 verification steps.