refactor: extract test user data and improve "New offers" test flow

- Extract test user data (seed phrases, DIDs, usernames) from importUser into separate getTestUserData function
- Refactor importUser to use getTestUserData internally, maintaining backward compatibility
- Update "New offers for another user" test to use new getTestUserData function
- Replace hardcoded seed phrase with programmatic retrieval using getTestUserData('00')
- Add proper TypeScript type annotations to array functions in testUtils
- Improve test maintainability by centralizing test user data management

This allows tests to access user data without executing import flow, providing more flexibility for test scenarios.

src/views/ImportAccountView.vue

@@ -189,6 +189,7 @@ export default class ImportAccountView extends Vue {
    * Uses importFromMnemonic utility for secure import
    */
   public async onImportClick() {
+    console.log("[ImportAccountView] onImportClick", this.mnemonic);
     if (!this.mnemonic?.trim()) {
       this.notify.warning(
         "Seed phrase is required to import an account.",
@@ -206,6 +207,7 @@ export default class ImportAccountView extends Vue {
 
       // Check what was actually imported
       const settings = await this.$accountSettings();
+      console.log("[ImportAccountView] settings", JSON.stringify(settings, null, 2));
 
       // Check account-specific settings
       if (settings?.activeDid) {