fix(portal): audio-clear-btn inherits global font for consistency (#1327)
follow-up to #1326 — the × button that clears a selected file in the
audio-replace row is the only remaining <button> in that group that
lacked `font-family: inherit`. it currently renders only an SVG icon
so there's no visible font right now, but matching the sibling buttons
keeps the group consistent and protects against future "what if we add
a tooltip text" changes.
Co-authored-by: Claude Opus 4 (1M context) <noreply@anthropic.com>
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