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/zh.ts

@@ -214,6 +214,8 @@ export const dict = {
   "prompt.popover.emptyCommands": "没有匹配的命令",
   "prompt.dropzone.label": "将图片或 PDF 拖到这里",
   "prompt.slash.badge.custom": "自定义",
+  "prompt.slash.badge.skill": "技能",
+  "prompt.slash.badge.mcp": "mcp",
   "prompt.context.active": "当前",
   "prompt.context.includeActiveFile": "包含当前文件",
   "prompt.context.removeActiveFile": "从上下文移除活动文件",