The byline mic rendered blue and with a smaller (16px) glyph next to the
gray 20px info icon, so it looked misaligned with an uneven gap. Add
optional color/iconSize props to MicButton (forwarded through
DictationGroup) and render the byline mic gray at 20px, wrapping it and
the info icon in a tight nowrap group so they read as a snug, aligned
pair. The AI chat mic is unchanged (passes neither prop).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>