chore: release v0.4.0

[github-actions]

Prepare v0.4.0.

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 v0.4.0 with compositor updates, configurable focus behavior, monitor-owned clients, and improved X11/Wayland handling.

New Features:

• Add configurable focus-boundary behavior and support tilde expansion in include paths.
• Upgrade the wl compositor dependency to v6.

Bug Fixes:

• Correct include handling and derive rules and centered geometry from the work area.
• Fix X11 resize thrashing and separate X11 resize requests from Wayland commits.

Enhancements:

• Make monitor-owned client collections private and enforce ownership.
• Make tag counts explicit, expose active tags beyond the bar baseline, and unify named actions with configuration effects.

Build:

• Bump the project and Arch package versions to 0.4.0 and update the lockfile.

CI:

• Move CI to Ubuntu 26.04 and add Amp orb setup scripts.

Documentation:

• Add the v0.4.0 changelog entry.

[sourcery-ai]

Reviewer's Guide

Prepares the v0.4.0 release by updating the Rust package and lockfile metadata, documenting the release contents in the changelog, and synchronizing both Arch package definitions to version 0.4.0.

File-Level Changes

Change	Details	Files
Publish the v0.4.0 release metadata and changelog entry.	Bump the Rust package version from 0.3.3 to 0.4.0. Regenerate the lockfile with the release version update. Add the v0.4.0 changelog entry, including categorized feature, behavior, fix, and maintenance notes.	Cargo.toml Cargo.lock CHANGELOG.md
Synchronize Arch package versions with the new release.	Set the source and prebuilt package versions to 0.4.0 while retaining the existing package release settings.	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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