refactor: remove single-use notification constant

- Replace constant usage with direct message string in ImportDerivedAccountView.vue
- Clean up import statement to remove unused import
- Remove unused constant from notifications.ts

src/views/ImportDerivedAccountView.vue

@@ -91,7 +91,6 @@ import { createNotifyHelpers, TIMEOUTS, NotifyFunction } from "@/utils/notify";
 import {
   NOTIFY_ACCOUNT_DERIVATION_SUCCESS,
   NOTIFY_ACCOUNT_DERIVATION_ERROR,
-  NOTIFY_DUPLICATE_DERIVED_ACCOUNT,
 } from "@/constants/notifications";
 
 @Component({
@@ -176,7 +175,7 @@ export default class ImportAccountView extends Vue {
       const isDuplicate = await this.checkForDuplicateAccount(newId.did);
       if (isDuplicate) {
         this.notify.warning(
-          NOTIFY_DUPLICATE_DERIVED_ACCOUNT.message,
+          "This derived account already exists. Please try a different derivation path.",
           TIMEOUTS.LONG,
         );
         return;