feat(前端界面): 优化注解交互，减少阅读遮挡

assets/webui/ofdgo.css

@@ -3130,6 +3130,8 @@ audio.page-media {
 .annotation-note {
 	position: absolute;
 	z-index: 2;
+	opacity: 0;
+	pointer-events: none;
 	width: 22px;
 	height: 22px;
 	padding: 0;
@@ -3143,6 +3145,13 @@ audio.page-media {
 	transform: rotate(var(--note-rotation, 0deg)) scale(var(--note-scale, 1)) translateX(-100%);
 }
 
+.annotation-note.active,
+.annotation-note.located,
+.annotation-note:focus {
+	opacity: 1;
+	pointer-events: auto;
+}
+
 .annotation-note.no-zoom {
 	--note-scale: calc(1 / var(--surface-scale, 1));
 }