Chrome's password manager aggressively autofills the clarify card's
input field with saved credentials (e.g. provider base URLs) despite
autocomplete='off'. This causes two bugs:
1. 'Clarification closed. Your draft was kept in the composer.' appears
on every session completion because _stashClarifyDraft reads the
autofilled value and treats it as a user draft.
2. The autofilled URL gets injected into the main composer, confusing
the user.
Fix: add readonly attribute to the clarify input element so Chrome's
autofill ignores it. When showClarifyCard() makes the card visible,
readonly is removed programmatically so the user can type normally.
Both the static HTML (index.html) and the dynamic DOM creation
(_ensureClarifyCardDom in messages.js) are patched.
f9ff6df883
