feat(app): show skill/mcp badges for slash commands

Display 'skill' or 'mcp' badge instead of 'custom' for slash commands
based on their source type. This provides better clarity to users about
where each command comes from.

packages/app/src/i18n/zht.ts

@@ -211,6 +211,8 @@ export const dict = {
   "prompt.popover.emptyCommands": "沒有符合的命令",
   "prompt.dropzone.label": "將圖片或 PDF 拖到這裡",
   "prompt.slash.badge.custom": "自訂",
+  "prompt.slash.badge.skill": "技能",
+  "prompt.slash.badge.mcp": "mcp",
   "prompt.context.active": "作用中",
   "prompt.context.includeActiveFile": "包含作用中檔案",
   "prompt.context.removeActiveFile": "從上下文移除目前檔案",