User-visible relabel only. Backend tone value stays NOVICE — no API
contract change, no migration on stored user.digest_tone, the
glossary/plain-prose depth of analysis is unchanged. The marketing
intent is that "Pro" reads better than "Novice" on the dashboard
header; landing/pricing/privacy copy still uses the word "Novice" in
flowing prose, so leaving those alone keeps the existing explanations
coherent until they get a copy pass.
Toggle width: the popup expansion (positioned left:0/right:0) is
sized by the container, which previously sized to the active button.
When "Pro" was active the popup was too narrow to fit "Intermediate".
Bumped .tone-toggle button min-width to 10em so both buttons reserve
enough room for the longest label regardless of which one is active.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>