feat: 添加下载设置功能，支持自定义文件名格式和下载路径配置

- 新增下载设置抽屉，允许用户设置下载路径和文件名格式
- 支持多种文件名格式预设和自定义格式
- 实现下载项的显示名称格式化
- 优化下载管理逻辑，避免重复通知

src/i18n/lang/en-US/download.ts

@@ -3,17 +3,20 @@ export default {
   localMusic: 'Local Music',
   count: '{count} songs in total',
   clearAll: 'Clear All',
+  settings: 'Settings',
   tabs: {
     downloading: 'Downloading',
     downloaded: 'Downloaded'
   },
   empty: {
     noTasks: 'No download tasks',
-    noDownloaded: 'No downloaded songs'
+    noDownloaded: 'No downloaded songs',
+    noDownloadedHint: 'Download your favorite songs to listen offline'
   },
   progress: {
     total: 'Total Progress: {progress}%'
   },
+  items: 'items',
   status: {
     downloading: 'Downloading',
     completed: 'Completed',
@@ -43,7 +46,8 @@ export default {
   },
   message: {
     downloadComplete: '{filename} download completed',
-    downloadFailed: '{filename} download failed: {error}'
+    downloadFailed: '{filename} download failed: {error}',
+    alreadyDownloading: '{filename} is already downloading'
   },
   loading: 'Loading...',
   playStarted: 'Play started: {name}',
@@ -51,5 +55,37 @@ export default {
   path: {
     copied: 'Path copied to clipboard',
     copyFailed: 'Failed to copy path'
+  },
+  settingsPanel: {
+    title: 'Download Settings',
+    path: 'Download Location',
+    pathDesc: 'Set where your music files will be saved',
+    pathPlaceholder: 'Please select download path',
+    noPathSelected: 'Please select download path first',
+    select: 'Select Folder',
+    open: 'Open Folder',
+    fileFormat: 'Filename Format',
+    fileFormatDesc: 'Set how downloaded music files will be named',
+    customFormat: 'Custom Format',
+    separator: 'Separator',
+    separators: {
+      dash: 'Space-dash-space',
+      underscore: 'Underscore',
+      space: 'Space'
+    },
+    dragToArrange: 'Sort or use arrow buttons to arrange:',
+    formatVariables: 'Available variables',
+    preview: 'Preview:',
+    saveSuccess: 'Download settings saved',
+    presets: {
+      songArtist: 'Song - Artist',
+      artistSong: 'Artist - Song',
+      songOnly: 'Song only'
+    },
+    components: {
+      songName: 'Song name',
+      artistName: 'Artist name',
+      albumName: 'Album name'
+    }
   }
 };