chore: release v0.5.1

[github-actions]

Prepare v0.5.1.

This PR is generated by .github/scripts/prepare-release.py and updates:

• Cargo.toml
• Cargo.lock
• CHANGELOG.md
• packaging/arch/PKGBUILD
• packaging/arch-bin/PKGBUILD

Summary by Sourcery

Release instantWM version 0.5.1 with tray, monitor, and window-management fixes alongside ownership and projection improvements.

Bug Fixes:

• Resolve named SVG and PNG tray icons and correct tray monitor orientation and policy handling.
• Fix cross-monitor redraw behavior and global window stacking.

Enhancements:

• Separate core transitions, layout execution, and native projections while strengthening ownership and borrow boundaries.
• Refactor client operations around monitor ownership and simplify shared policy access.

Build:

• Bump the project and Arch package versions to 0.5.1.

Documentation:

• Add the v0.5.1 changelog entry.

[sourcery-ai]

Reviewer's Guide

This generated release-preparation PR promotes instantWM from v0.5.0 to v0.5.1 by synchronizing Cargo package metadata, lockfile metadata, Arch package versions, and the changelog; it contains no functional source-code changes.

File-Level Changes

Change	Details	Files
Record the v0.5.1 release and its included changes and fixes.	Add the v0.5.1 changelog entry, comparison link, release date, and categorized highlights.	CHANGELOG.md
Synchronize the project and lockfile package versions for the release.	Bump the crate version from 0.5.0 to 0.5.1. Update the corresponding Cargo.lock version metadata.	Cargo.toml Cargo.lock
Update Arch packaging metadata to target the new release.	Bump pkgver from 0.5.0 to 0.5.1 for source and binary packages.	packaging/arch/PKGBUILD packaging/arch-bin/PKGBUILD

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[sourcery-ai]

Hey - I've reviewed your changes and they look great!

Sourcery assessment

Approved.

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