fix: pinned windows over fullscreen window while dragging

[Yocraft-2000]

Summary

Pinned windows stays over fullscreen windows while moving them.

Motivation

The pinned windows disappeared when moving them over a fullscreen window.

Type of Change

• Bug fix
• New feature
• Breaking change
• Refactoring
• Build / packaging
• Documentation

Related Issue

On discord.

Testing

Manual Coverage

• Tested in a nested Umbriel session
• Tested in a native Umbriel session
• Tested with multiple monitors
• Tested with a scaled output
• Tested with native Wayland applications
• Tested with X11 applications through xwayland-satellite
• Tested with the scrolling layout
• Tested with the dwindle layout

Screenshots / Videos

Checklist

• This PR is ready for review, or it is marked as Draft.
• I read and followed the relevant guidance in CONTRIBUTING.md.
• I initialized and updated the SceneFX submodule where required.
• I ran just format, or this PR has no C++ changes.
• I ran the relevant build, test, lint, or verification commands, or explained why they were not run.
• I functionally verified compositor behavior where automated checks are insufficient.
• I self-reviewed the changes.
• I checked for new warnings or errors.
• I updated docs/ and examples/config.toml, or this PR does not change user-facing configuration or behavior.
• I used canonical names for config keys, IPC actions, paths, and identifiers.

Additional Notes

[Ly-sec]

Hey @Yocraft-2000 the fix looks reasonable, but the reset changes dragTree ordering relative to dragIconTree, which could place dragged windows above data-device drag icons.

Could you restore the original order by placing dragTree below dragIconTree, then dragShadowTree below dragTree? That would also make the newly added layer-shell protocol include unnecessary in view.cpp I'm fairly certain.