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/de.ts

@@ -214,6 +214,8 @@ export const dict = {
   "prompt.popover.emptyCommands": "Keine passenden Befehle",
   "prompt.dropzone.label": "Bilder oder PDFs hier ablegen",
   "prompt.slash.badge.custom": "benutzerdefiniert",
+  "prompt.slash.badge.skill": "skill",
+  "prompt.slash.badge.mcp": "mcp",
   "prompt.context.active": "aktiv",
   "prompt.context.includeActiveFile": "Aktive Datei einbeziehen",
   "prompt.context.removeActiveFile": "Aktive Datei aus dem Kontext entfernen",