Make output discovery compositor-independent

[riccardomarotti]

Summary

• Replace Hyprland-specific monitor discovery with SCTK OutputState backed by xdg-output.
• Use logical output position and size directly, while preserving direct wl_output ownership and transform handling.
• Remove runtime dependencies on hyprctl monitors -j and hyprctl cursorpos.
• Keep pointer coordinates compositor-independent via Wayland pointer events.
• Separate clipped monitor-local rectangle drawing from full global drag dimensions so labels remain correct across monitor boundaries.
• Update protocol documentation and remove unused JSON dependencies.

Testing

• just check
• cargo test
• cargo check --all --locked
• cargo clippy --all --locked -- -D warnings
• cargo build --release --locked
• Manual testing on Umbriel and Hyprland, including a three-monitor setup, cross-monitor dragging, and output rotations 0°, 90°, 180°, and 270°.

[t4t5]

Oh this is cool! I might have to consider changing the name of the package though 😆

[t4t5]

Works great! Merging!

[riccardomarotti]

Oh this is cool! I might have to consider changing the name of the package though 😆

I actually think the name is still pretty cool, even if it's not Hyprland-only anymore 😄