chore: release v0.1.4

[github-actions]

Prepare v0.1.4.

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

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

Summary by Sourcery

Prepare the v0.1.4 release of instantwm by updating metadata and changelog entries.

Build:

• Bump crate version to 0.1.4 in Cargo.toml and refresh Cargo.lock.
• Update Arch PKGBUILD package version to 0.1.4.

Documentation:

• Add v0.1.4 section to the changelog describing recent CI fixes and refactors.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Release preparation for v0.1.4: bumps crate and packaging versions, updates changelog with 0.1.4 entry, and refreshes Cargo.lock via the automated release script.

File-Level Changes

Change	Details	Files
Add 0.1.4 release entry to the changelog.	Insert new 0.1.4 section under Unreleased with comparison link and release date Document CI-related work (merge commit handling, refactors) under the 0.1.4 "Other" subsection	CHANGELOG.md
Bump project/package version from 0.1.3 to 0.1.4 across build and packaging metadata.	Update crate version field from 0.1.3 to 0.1.4 in the Rust package manifest Update Arch Linux PKGBUILD pkgver from 0.1.3 to 0.1.4 for distro packaging Regenerate Cargo.lock to reflect the new instantwm package version	Cargo.toml packaging/arch/PKGBUILD Cargo.lock

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