ext(sw): add preview_totp_from_secret popup handler

extension/src/shared/messages.ts

@@ -59,7 +59,8 @@ export type PopupMessage =
       newRemote: { hostType: 'gitea' | 'github'; hostUrl: string; repoPath: string; apiToken: string };
     }
   | { type: 'parse_lastpass_csv'; bytes: ArrayBuffer }
-  | { type: 'import_lastpass_commit'; items: Item[] };
+  | { type: 'import_lastpass_commit'; items: Item[] }
+  | { type: 'preview_totp_from_secret'; secret_b32: string };
 
 // --- Messages a content script may send ---
 
@@ -166,6 +167,7 @@ export const POPUP_ONLY_TYPES: ReadonlySet<PopupMessage['type']> = new Set([
   'get_session_config', 'update_session_config',
   'export_backup', 'restore_backup',
   'parse_lastpass_csv', 'import_lastpass_commit',
+  'preview_totp_from_secret',
 ] as PopupMessage['type'][]);
 
 export interface ExportBackupResponse extends Extract<Response, { ok: true }> {