chore: improve invitation flow, update project dependencies and documentation for Next.js 16 (#408)

* chore: update project dependencies and documentation for Next.js 16

- Upgraded Next.js from version 15 to 16 across various documentation files and components.
- Updated references to Next.js 16 in AGENTS.md and CLAUDE.md for consistency.
- Incremented application version to 2.21.0 in package.json.
- Refactored identity setup components to improve user experience and added confirmation dialogs for authentication methods.
- Enhanced invitation flow with new logic for handling user redirection and token generation.

* refactor: streamline invitation flow in e2e tests

- Simplified the invitation flow test by using a predefined email instead of generating a random one.
- Removed unnecessary steps such as clearing cookies and reloading the page before user sign-up.
- Enhanced clarity by eliminating commented-out code related to identity verification and user membership checks.

* refactor: improve code readability in IdentitiesPage and UpdatePasswordForm components

- Enhanced formatting of JSX elements in IdentitiesPage and UpdatePasswordForm for better readability.
- Adjusted indentation and line breaks to maintain consistent coding style across components.

* refactor: enhance LinkAccountsList component with user redirection logic

- Updated the LinkAccountsList component to include a redirectToPath option in the useLinkIdentityWithProvider hook for improved user experience.
- Removed redundant user hook declaration to streamline the code structure.

* refactor: update account setup logic in JoinTeamAccountPage

- Introduced a check for email-only authentication support to streamline account setup requirements.
- Adjusted the conditions for determining if a new account should set up additional authentication methods, enhancing user experience for new users.

apps/e2e/tests/invitations/invitations.po.ts

@@ -132,16 +132,32 @@ export class InvitationsPageObject {
     await this.page.waitForTimeout(500);
 
     // skip authentication setup
-    const skipIdentitiesButton = this.page.locator(
-      '[data-test="skip-identities-button"]',
+    const continueButton = this.page.locator(
+      '[data-test="continue-button"]',
     );
 
     if (
-      await skipIdentitiesButton.isVisible({
+      await continueButton.isVisible({
         timeout: 1000,
       })
     ) {
-      await skipIdentitiesButton.click();
+      await continueButton.click();
+
+      // Handle confirmation dialog that appears when skipping without adding auth
+      const confirmationDialog = this.page.locator(
+        '[data-test="no-auth-method-dialog"]',
+      );
+
+      if (
+        await confirmationDialog.isVisible({
+          timeout: 2000,
+        })
+      ) {
+        console.log('Confirmation dialog appeared, clicking Continue...');
+        await this.page
+          .locator('[data-test="no-auth-dialog-continue"]')
+          .click();
+      }
     }
 
     // wait for redirect to account home