The composer's mic icon buttons used tooltip="Dictate" /
"Stop dictation" but no aria-label, so screen-reader users heard
only the empty SVG-only button. Every other composer icon button
(Send, Add Attachment, audio buttons, composer pills) carries an
explicit aria-label; the shared-composer.tsx implementation already
does too. Mirror that here for parity.
Co-authored-by: danielhanchen <michaelhan2050@gmail.com>
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