adjust playlist folder design, add animations

src/renderer/features/sidebar/components/playlist-folder-tree.module.css

@@ -22,7 +22,7 @@
     gap: var(--theme-spacing-md);
     align-items: center;
     width: 100%;
-    padding: var(--theme-spacing-xs) var(--theme-spacing-md);
+    padding: var(--theme-spacing-sm) var(--theme-spacing-md);
     font: inherit;
     color: inherit;
     text-align: left;
@@ -32,12 +32,18 @@
     border-radius: var(--theme-radius-md);
 
     &:hover {
-        background-color: var(--theme-colors-surface);
+        background-color: var(--theme-colors-background);
     }
 }
 
 .chevron {
+    display: flex;
     flex-shrink: 0;
+    align-items: center;
+}
+
+.collapse {
+    overflow: hidden;
 }
 
 .name {

src/renderer/features/sidebar/components/playlist-folder-tree.tsx

@@ -1,9 +1,11 @@
 import clsx from 'clsx';
+import { motion } from 'motion/react';
 import {
     ComponentPropsWithoutRef,
     CSSProperties,
     MouseEvent,
     ReactElement,
+    ReactNode,
     useCallback,
     useMemo,
     useState,
@@ -33,6 +35,25 @@ import { DragData, DragOperation, DragTarget } from '/@/shared/types/drag-and-dr
 
 const STORAGE_KEY_PREFIX = 'feishin:playlist-folder-state';
 
+const FOLDER_COLLAPSE_TRANSITION = { duration: 0.2, ease: 'easeInOut' } as const;
+
+interface PlaylistFolderCollapseProps {
+    children: ReactNode;
+    className?: string;
+    open: boolean;
+}
+
+const PlaylistFolderCollapse = ({ children, className, open }: PlaylistFolderCollapseProps) => (
+    <motion.div
+        animate={{ height: open ? 'auto' : 0, opacity: open ? 1 : 0 }}
+        className={clsx(styles.collapse, className)}
+        initial={false}
+        transition={FOLDER_COLLAPSE_TRANSITION}
+    >
+        {children}
+    </motion.div>
+);
+
 export const getPlaylistLeafName = (name: string, separator: string): string => {
     if (!separator) return name;
     const segments = name.split(separator).filter((segment) => segment.length > 0);
@@ -457,7 +478,7 @@ const PlaylistFolderHeader = ({
                 type="button"
             >
                 <div className={styles.navFolderIcon}>
-                    <Icon color="muted" icon="folder" size="xl" />
+                    <Icon color="muted" icon={isOpen ? 'folder' : 'folderClosed'} size="md" />
                 </div>
                 <Text className={styles.name} fw={500} size="md">
                     {name}
@@ -482,18 +503,21 @@ const PlaylistFolderHeader = ({
             style={{ opacity: isDragging ? 0.5 : 1 }}
             type="button"
         >
-            <Icon
-                className={styles.chevron}
-                icon={isOpen ? 'arrowDownS' : 'arrowRightS'}
-                size="sm"
-            />
-            <Icon color="muted" icon="folder" size="sm" />
+            <Icon color="muted" icon={isOpen ? 'folder' : 'folderClosed'} size="md" />
             <Text className={styles.name} fw={500} size="md">
                 {name}
             </Text>
             <Text className={styles.count} isMuted size="sm">
                 {leafCount}
             </Text>
+            <motion.span
+                animate={{ rotate: isOpen ? 180 : 0 }}
+                className={styles.chevron}
+                initial={false}
+                transition={FOLDER_COLLAPSE_TRANSITION}
+            >
+                <Icon icon="arrowUpS" size="md" />
+            </motion.span>
         </button>
     );
 };
@@ -724,20 +748,18 @@ export const PlaylistFolderTree = ({
                             onClick={() => onToggleFolder(group.name)}
                             variant="header"
                         />
-                        {isOpen && (
-                            <div className={styles.children}>
-                                {group.items.map((item) => (
-                                    <PlaylistRowButton
-                                        item={item}
-                                        key={item.id}
-                                        name={item.name.slice(group.name.length + 1)}
-                                        onContextMenu={onContextMenu}
-                                        onReorder={onReorder}
-                                        to={item.id}
-                                    />
-                                ))}
-                            </div>
-                        )}
+                        <PlaylistFolderCollapse className={styles.children} open={isOpen}>
+                            {group.items.map((item) => (
+                                <PlaylistRowButton
+                                    item={item}
+                                    key={item.id}
+                                    name={item.name.slice(group.name.length + 1)}
+                                    onContextMenu={onContextMenu}
+                                    onReorder={onReorder}
+                                    to={item.id}
+                                />
+                            ))}
+                        </PlaylistFolderCollapse>
                     </div>
                 );
             })}
@@ -788,15 +810,13 @@ export const PlaylistFolderTreeView = ({
                     onClick={() => onToggleFolder(node.path)}
                     variant="header"
                 />
-                {isOpen && (
-                    <div className={styles.treeChildren}>
-                        {node.children.map((child) => (
-                            <div className={styles.treeBranch} key={getNodeKey(child)}>
-                                {renderNode(child)}
-                            </div>
-                        ))}
-                    </div>
-                )}
+                <PlaylistFolderCollapse className={styles.treeChildren} open={isOpen}>
+                    {node.children.map((child) => (
+                        <div className={styles.treeBranch} key={getNodeKey(child)}>
+                            {renderNode(child)}
+                        </div>
+                    ))}
+                </PlaylistFolderCollapse>
             </div>
         );
     };

src/renderer/features/sidebar/components/sidebar-playlist-list.tsx

@@ -571,7 +571,7 @@ export const SidebarPlaylistList = () => {
                             {inNavigation ? navigation.currentName : t('page.sidebar.playlists')}
                         </Text>
                     </Group>
-                    <Group gap="xs">
+                    <Group gap="xs" wrap="nowrap">
                         <ActionIcon
                             icon="add"
                             iconProps={{

src/shared/components/icon/icon.tsx

@@ -54,6 +54,7 @@ import {
     LuExternalLink,
     LuFileJson,
     LuFlag,
+    LuFolderClosed,
     LuFolderOpen,
     LuGauge,
     LuGithub,
@@ -278,6 +279,7 @@ export const AppIcon = {
     fileJson: LuFileJson,
     filter: LuListFilter,
     folder: LuFolderOpen,
+    folderClosed: LuFolderClosed,
     genre: LuFlag,
     goToItem: LuCornerDownRight,
     hash: LuHash,