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/constants/notifications.ts

@@ -1697,11 +1697,3 @@ export const NOTIFY_DUPLICATE_ACCOUNT_IMPORT = {
   message:
     "This account has already been imported. Please use a different seed phrase or check your existing accounts.",
 };
-
-// ImportDerivedAccountView.vue specific constants
-// Used in: ImportDerivedAccountView.vue (incrementDerivation method - duplicate derived account warning)
-export const NOTIFY_DUPLICATE_DERIVED_ACCOUNT = {
-  title: "Derived Account Already Exists",
-  message:
-    "This derived account already exists. Please try a different derivation path.",
-};

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;