feat(dragdrop): drag & drop complet de fichiers/dossiers & intégration IA (#89)

frontend/locales/en.json

@@ -634,6 +634,13 @@
   "dashboard.zero_files": "0 files",
   "dragdrop.cross_vault_unsupported": "Cross-vault moves are not supported",
   "dragdrop.move_failed": "Move failed",
+  "dragdrop.overlay_title": "Drop files or folders",
+  "dragdrop.overlay_vault_zone": "Import into Vault",
+  "dragdrop.overlay_ai_zone": "Analyze with AI Assistant",
+  "upload.uploading": "Uploading {count} file(s)...",
+  "upload.success": "Successfully imported {count} file(s)",
+  "upload.partial": "Imported {count} file(s) ({errors} errors)",
+  "upload.error": "Upload failed",
   "editor.cancel": "Cancel",
   "editor.close": "Close",
   "editor.delete_error": "Delete error",