EWW: Fix popup window not closing properly, add wlr-randr to guivm

[kajusnau]

Description of changes

1. Fixed Popups Not Closing Automatically

   • Resolved an issue where popups were reserving screen space even after "closing".
   • This applies to volume and brightness change indicators (previously referred to as hotkey indicators).

2. Adjusted Popups to Have Their Own Windows

   • Updated popup behavior so that each popup now opens in a separate, isolated window. Popups will no longer interfere with each other and simply overlap instead.

3. Added Functionality to Close Widgets by Clicking Outside

   • Widgets should now close automatically when clicking outside their area (e.g. on the desktop).
   • This applies to power menu, calendar and quick settings widgets.

4. Added wlr-randr to guivm:

   • To be used in the future by Ghaf control panel.

Notes:

• If multiple displays are connected, volume and brightness popups show up only on the built-in display.

Checklist for things done

• [x] Summary of the proposed changes in the PR description
• [x] More detailed description in the commit message(s)
• [x] Commits are squashed into relevant entities - avoid a lot of minimal dev time commits in the PR
• [x] Contribution guidelines followed
• [ ] Ghaf documentation updated with the commit - https://tiiuae.github.io/ghaf/
• [ ] PR linked to architecture documentation and requirement(s) (ticket id)
• [x] Test procedure described (or includes tests). Select one or more:
  • [ ] Tested on Lenovo X1 x86_64
  • [ ] Tested on Jetson Orin NX or AGX aarch64
  • [ ] Tested on Polarfire riscv64
• [ ] Author has run make-checks and it passes
• [ ] All automatic Github Action checks pass - see actions
• [x] Author has added reviewers and removed PR draft status
• [ ] Change requires full re-installation
• [x] Change can be updated with nixos-rebuild ... switch

Instructions for Testing

• [ ] List all targets that this applies to:
• [ ] Is this a new feature
  • [x] List the test steps to verify:
  • Please Verify All Functionality With Multiple Displays As Well
  • Adjust system brightness or volume using hotkeys (F1-F3, F5-F6) and observe behavior of popup window:
    • The area behind the popup window should be immediately accessible (can be clicked) when popup disappears
  • Open any taskbar widget and attempt to click outside of its area - the widget should close.
  • (Optional) open a terminal and verify wlr-randr is a recognized command.
• [x] If it is an improvement how does it impact existing functionality?

[milva-unikie]

Tested on Lenovo-X1 (nixos-rebuild switch)

Everything is fine!

• Popups don't reserve the space after closing.
• Popups are only on internal screen.
• Widgets close when clicked outside of them.
• External monitor does not cause issues.
• wlr-randr is available in gui-vm.
• Test-automation passes.