chore: update Playwright and Skeleton dependencies in package.json and bun.lock

- Upgrade @playwright/test from version 1.48.0 to 1.56.1 in frontend/package.json.
- Reintroduce @skeletonlabs/skeleton and @skeletonlabs/skeleton-svelte at version 4.2.4 in bun.lock.
- Add new dependencies related to Playwright and Skeleton in bun.lock for improved functionality.

Author: nirukk52