fix: keep the volume readout out of the live regions

src/components/DriveControls.vue

@@ -313,9 +313,12 @@ onBeforeUnmount(() => {
             max="1"
             step="0.05"
             :value="audioVolume"
+            :aria-valuetext="`${Math.round(audioVolume * 100)}%`"
             @input="changeVolume"
           />
-          <output for="drive-volume">{{ Math.round(audioVolume * 100) }}%</output>
+          <!-- A plain readout: <output> is an implicit live region and would
+               compete with the motion status announcer. -->
+          <span class="drive-popover__readout" aria-hidden="true">{{ Math.round(audioVolume * 100) }}%</span>
         </div>
       </template>
       <button