fix(portal): audio buttons inherit global font (#1326)
the "version history" button rendered in the browser default sans-serif
instead of the user's selected global font (mono by default). <button>
elements don't inherit font-family by default, so an explicit
`font-family: inherit` is required. matches the pattern already used
in login, tag, and track routes.
also added to .audio-replace-btn (same root cause; not visible in the
current screenshot because it only appears after a file is selected)
and .audio-upload-btn (it's on a <label> so inherits implicitly, but
adding for consistency and to protect against future markup changes).
Co-authored-by: Claude Opus 4 (1M context) <noreply@anthropic.com>
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