[PB-5743]: feat/show dialog to download backup keys

[xabg2]

Description

After login or registration, a modal will appear reminding the user to download their backup key. The behavior is:

• If the user has never seen the dialog, it opens automatically.
• The user can download the backup key at any time using the download button.
• Clicking "Remind me later" dismisses the dialog and will not show it again for 14 days or he is authenticated again.
• Once the user downloads the key and clicks "I've saved my key", the dialog will never be shown again.
• If the user logs in with a different account, the dialog will appear again for that account (state is stored per user).
• The dialog will not appear again after logout and login (with the same account) if the user already acknowledged it.
• While the dialog is open, promotional banners should be hidden.

Related Issues

Related Pull Requests

Checklist

• Changes have been tested locally.
• Unit tests have been written or updated as necessary.
• The code adheres to the repository's coding standards.
• Relevant documentation has been added or updated.
• No new warnings or errors have been introduced.
• SonarCloud issues have been reviewed and addressed.
• QA Passed

Testing Process

Additional Notes

[cloudflare-workers-and-pages]

Deploying drive-web with    Cloudflare Pages

Latest commit:	17934be
Status:	✅  Deploy successful!
Preview URL:	https://2e0701cd.drive-web.pages.dev
Branch Preview URL:	https://feature-backup-key-acknowled.drive-web.pages.dev

View logs

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud