feat: add float+pin window toggle

[dhanushka2001]

Description

This pull request adds a new keybind Super+Alt+T that uses a simple 2-line hyprctl dispatch script to toggle floating + pinning (sticky) mode for the active window.

Changes

• Improved
• Bug Fixes
• Feature
• Documentation
• Other

Context

I found this feature useful when I want a floating window to be visible even when switching workspaces. The window can be easily toggled back to not be floating and pinned by pressing Super+Alt+T again or even just Super+T.

How Has This Been Tested?

• Tested on Arch Linux/Based Distro.
• Tested on Fedora Linux/Based Distro.
• Tested on openSuse.

Checklist

• My code follows the style guidelines of this project.
• I have performed a self-review of my code.
• I have commented on my code, particularly in hard-to-understand areas.
• My changes do not introduce new warnings.
• I have added tests that prove my fix is effective or that my feature works.
• I have made corresponding changes to the documentation
• New and existing unit tests pass locally with my changes.

Screenshots

Additional Notes

In my custom.conf I have switched the keybindings for the "float all windows" toggle and my float+pin window toggle, so my float+pin window toggle keybind is actually Super+Shift+T which is easier to press, as I find I use the feature much more than the "float all windows" toggle. It also better aligns with the standard keybinding Super+Shift+[1-9] to move a window to another workspace. But in the interest of not messing with pre-existing default keybinds, I have not made this switch in this PR.