格式化BGM界面涉及的两个文件

对 index.css 与 ImageCanvasBackgroundMusicPresetMarquee.tsx 执行 Prettier，
消除评审提到的格式检查告警。纯格式改动，语义不变。

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/components/image-editor/ImageCanvasBackgroundMusicPresetMarquee.tsx

@@ -47,7 +47,10 @@ const PRESET_HOVER_CONTROL_QUERY = '(hover: hover) and (pointer: fine)';
 type BackgroundMusicPresetZone = 'left' | 'center' | 'right' | null;
 
 function readsMediaQueryMatches(query: string) {
-  if (typeof window === 'undefined' || typeof window.matchMedia !== 'function') {
+  if (
+    typeof window === 'undefined' ||
+    typeof window.matchMedia !== 'function'
+  ) {
     return false;
   }
   return window.matchMedia(query).matches;
@@ -102,7 +105,9 @@ export function ImageCanvasBackgroundMusicPresetMarquee({
   const prefersReducedMotion = useMediaQueryMatches(
     PRESET_REDUCED_MOTION_QUERY,
   );
-  const supportsHoverControls = useMediaQueryMatches(PRESET_HOVER_CONTROL_QUERY);
+  const supportsHoverControls = useMediaQueryMatches(
+    PRESET_HOVER_CONTROL_QUERY,
+  );
   const [isTouchScrolling, setIsTouchScrolling] = useState(false);
 
   const viewportRef = useRef<HTMLDivElement | null>(null);
@@ -110,7 +115,9 @@ export function ImageCanvasBackgroundMusicPresetMarquee({
   const queueWidthRef = useRef(0);
   const frameRef = useRef<number | null>(null);
   const frameTimestampRef = useRef<number | null>(null);
-  const touchSettleTimerRef = useRef<ReturnType<typeof setTimeout> | null>(null);
+  const touchSettleTimerRef = useRef<ReturnType<typeof setTimeout> | null>(
+    null,
+  );
 
   // 归位只按实测的单份队列宽度取模，不硬编码 chip 或轨道宽度。
   const normalizeScrollPosition = useCallback(() => {
@@ -316,7 +323,8 @@ export function ImageCanvasBackgroundMusicPresetMarquee({
     if (!viewport) {
       return;
     }
-    const step = viewport.getBoundingClientRect().width * PRESET_ARROW_STEP_RATIO;
+    const step =
+      viewport.getBoundingClientRect().width * PRESET_ARROW_STEP_RATIO;
     // 离散滚动不使用平滑动画，供触摸和键盘使用。
     viewport.scrollLeft += direction * (step || PRESET_FAST_VELOCITY);
     normalizeScrollPosition();

src/index.css

@@ -963,7 +963,6 @@ html[data-mobile-keyboard-open='true'] #root {
   font-family: var(--platform-font-family) !important;
 }
 
-
 .platform-brand-logo {
   display: inline-flex;
   flex: none;
@@ -3303,8 +3302,7 @@ html[data-mobile-keyboard-open='true'] .platform-mobile-bottom-dock {
   display: block;
 }
 
-.creation-landing__asset-waterfall--masonry
-  > .creation-landing__asset-card {
+.creation-landing__asset-waterfall--masonry > .creation-landing__asset-card {
   position: absolute;
   box-sizing: border-box;
 }
@@ -3440,7 +3438,8 @@ html[data-mobile-keyboard-open='true'] .platform-mobile-bottom-dock {
   place-items: center;
 }
 
-.creation-landing__asset-preview--campaign .creation-landing__asset-preview-media {
+.creation-landing__asset-preview--campaign
+  .creation-landing__asset-preview-media {
   position: absolute;
   inset: 0;
   width: 100%;
@@ -6769,7 +6768,7 @@ html[data-mobile-keyboard-open='true'] .platform-mobile-bottom-dock {
   display: grid;
   grid-template-columns: max-content minmax(0, 1fr) max-content max-content max-content;
   align-items: center;
-  gap: 0.10rem;
+  gap: 0.1rem;
   justify-content: start;
   position: relative;
   border-top: 1px solid rgba(15, 23, 42, 0.06);
@@ -8076,7 +8075,8 @@ button.image-canvas-editor__reference-chip:disabled {
   line-height: 1.2;
 }
 
-.image-canvas-editor__asset-context-menu button:disabled
+.image-canvas-editor__asset-context-menu
+  button:disabled
   .image-canvas-editor__asset-context-menu-reason {
   color: #94a3b8;
 }
@@ -17082,7 +17082,9 @@ button {
   bottom: 0;
   height: 1px;
   background: var(--image-canvas-brand-border-strong, #f97316);
-  transition: left 0.12s ease, width 0.12s ease;
+  transition:
+    left 0.12s ease,
+    width 0.12s ease;
 }
 
 .image-canvas-editor__background-music-presets-hairline--left::after {