refactor(ext/popup): extract Login to types/login.ts on shared helpers

extension/src/popup/popup.ts

@@ -38,6 +38,7 @@ export interface PopupState {
   // to the content script. See router/popup-only.ts#handleFillCredentials.
   capturedTabId: number | null;
   capturedUrl: string;
+  newType: import('../shared/types').ItemType | null;
 }
 
 let currentState: PopupState = {
@@ -52,6 +53,7 @@ let currentState: PopupState = {
   loading: false,
   capturedTabId: null,
   capturedUrl: '',
+  newType: null,
 };
 
 export function getState(): PopupState {