chore: cleanup deps (#14525)

#### PR Dependency Tree


* **PR #14525** 👈

This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **Chores**
  * Removed an unused development dependency.
* Updated dotLottie/Lottie-related dependency versions across packages
and replaced a removed player dependency with the new package.

* **Refactor**
* AI animated icons now re-export from a shared component and are loaded
only in the browser, reducing upfront bundle weight and centralizing
icon assets.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/backend/server/package.json

@@ -126,7 +126,6 @@
     "@faker-js/faker": "^10.1.0",
     "@nestjs/swagger": "^11.2.0",
     "@nestjs/testing": "patch:@nestjs/testing@npm%3A10.4.15#~/.yarn/patches/@nestjs-testing-npm-10.4.15-d591a1705a.patch",
-    "@react-email/preview-server": "^4.3.2",
     "@types/cookie-parser": "^1.4.8",
     "@types/express": "^5.0.1",
     "@types/express-serve-static-core": "^5.0.6",