fix(dictation): drive the recording halo from mic level under reduced-motion

The live mic-level halo around the stop button was frozen at a constant
scale (1.15) whenever the OS "Reduce motion" setting was on, so it never
reacted to the voice while dictating. Make haloScale unconditional so it
always follows audioLevel (amplitude 0.9), and drop the now-unused
useReducedMotion import and reduceMotion local.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

apps/client/src/features/dictation/components/mic-button.tsx

@@ -1,6 +1,5 @@
 import { FC } from "react";
 import { ActionIcon, Loader, Tooltip } from "@mantine/core";
-import { useReducedMotion } from "@mantine/hooks";
 import { IconMicrophone, IconPlayerStopFilled } from "@tabler/icons-react";
 import { useTranslation } from "react-i18next";
 import { useDictation } from "@/features/dictation/hooks/use-dictation";
@@ -29,12 +28,11 @@ export const MicButton: FC<MicButtonProps> = ({
 }) => {
   const { t } = useTranslation();
   const { status, start, stop, audioLevel } = useDictation({ onText, onStart });
-  const reduceMotion = useReducedMotion();
   const iconSize = size === "lg" ? 18 : 16;
 
   if (status === "recording") {
-    // Live volume-driven halo, or a static halo when the user prefers reduced motion.
-    const haloScale = reduceMotion ? 1.15 : 1 + Math.min(1, audioLevel) * 0.9;
+    // Live volume-driven halo: the scale follows the current mic level.
+    const haloScale = 1 + Math.min(1, audioLevel) * 0.9;
     return (
       <Tooltip label={t("Stop recording")} withArrow>
         <span className={classes.recordingWrap}>