Fixed a couple of bugs with the PIP user video window.

[barankyle]

Summary

Controls were being z-indexed behind the other elements and shrunk on hover on large screens,
which didn't have any purpose; removed hover/focus styling on large screens.

Setting window position via right but then always changing the left was causing problems with snap
to left/right logic; changed initial position to also be set via left.

Checklist

• Pre-push checks pass npm run check
  • Linter passing via npm run lint
  • Unit & Integration tests passing via npm run test:packages
  • Docker build process passing via npm run build-client
• If this PR is still a WIP, convert to a draft
• When this PR is ready, mark it as "Ready for review"
• Changes have been manually QA'd
• Changes reviewed by at least 2 approved reviewers

References

References to pertaining issue(s)

QA Steps

1. git checkout pr_branch_name
2. npm install
3. npm run dev-reinit
4. npm run dev

List any additional steps required to QA the changes of this PR, as well as any supplemental images or videos.

Reviewers

Reviewers for this PR