Angular version is outdated

[aglinxinyuan]

Task Summary

Angular versions v2 to v18 are no longer supported.
We are still at Angular v16.
Angular v20 will end its support this year, so I suggest upgrading to Angular v21.
There is also a CVE except v21. CVE-2025-66035

Source: https://angular.dev/reference/releases

Priority

P2 – Medium

Task Type

• Code Implementation
• Documentation
• Refactor / Cleanup
• Testing / QA
• DevOps / Deployment

[Yicong-Huang]

@aglinxinyuan I updated this issue to be more like an umbrella ticket. please create sub-issue for upgrade to angular 21, thanks!