fix(cursor): address review findings — aria-label, 3D transform sync, i18n

- Add aria-label to cursorClipToBounds Switch so screen readers announce the control
- Mirror composite3D 3D transform onto nativeCursorClipRef so the cursor clip layer
  rotates with the video during 3D zoom regions (cursor stays outside preserve-3d
  so clip-path continues to work; only the transform string is mirrored)
- Fix vi cursor.motionBlur: "Mờ chuyển động" → "Làm mờ chuyển động" to match
  effects.motionBlur phrasing
- Fix zh-TW cursor.motionBlur: "運動模糊" → "動態模糊" to match effects.motionBlur

src/components/video-editor/SettingsPanel.tsx

@@ -1426,6 +1426,7 @@ export function SettingsPanel({
 																checked={cursorClipToBounds}
 																onCheckedChange={onCursorClipToBoundsChange}
 																className="data-[state=checked]:bg-[#34B27B] scale-90"
+																aria-label={t("cursor.clipToBounds")}
 															/>
 														</div>
 														<div className="grid grid-cols-2 gap-2">

src/components/video-editor/VideoPlayback.tsx

@@ -1634,6 +1634,9 @@ const VideoPlayback = forwardRef<VideoPlaybackRef, VideoPlaybackProps>(
 							composite3D.style.willChange = "auto";
 							lastTransformIsIdentity = true;
 						}
+						if (nativeCursorClipRef.current) {
+							nativeCursorClipRef.current.style.transform = "";
+						}
 						if (lastPerspectiveValue !== 0) {
 							outerWrapper.style.perspective = "";
 							lastPerspectiveValue = 0;
@@ -1650,6 +1653,9 @@ const VideoPlayback = forwardRef<VideoPlaybackRef, VideoPlaybackProps>(
 						);
 						composite3D.style.transform = `scale(${containScale}) rotateX(${effectiveRotation.rotationX}deg) rotateY(${effectiveRotation.rotationY}deg) rotateZ(${effectiveRotation.rotationZ}deg)`;
 						composite3D.style.willChange = "transform";
+						if (nativeCursorClipRef.current) {
+							nativeCursorClipRef.current.style.transform = composite3D.style.transform;
+						}
 						lastTransformIsIdentity = false;
 						if (persp !== lastPerspectiveValue) {
 							outerWrapper.style.perspective = `${persp}px`;