fix: clear sticky windows, or floating windows focus hint if focus moves

[hojjatabdollahi]

If you open a window in floating mode and then move focus to a window on another output, the floating window in the previous output still has the focus hint around it.

This was part of #2549. But can be reviewed and merged separately.

---

• I have disclosed use of any AI generated code in my commit messages.
  • If you are using an LLM, and do not fully understand the changes it is making to the code base, do not create a PR.
  • In our experience, AI generated code often results in overly complex code that lacks enough context for a proper fix or feature inclusion. This results in considerably longer code reviews. Due to this, AI authored or partially authored PRs may be closed without comment.
• I understand these changes in full and will be able to respond to review comments.
• My change is accurately described in the commit message.
• My contribution is tested and working as described.
• I have read the Developer Certificate of Origin and certify my contribution under its conditions.