chore: release v5.1.5

[github-actions]

Prepare v5.1.5.

This PR updates Cargo metadata, the changelog, the generated man page, and Arch package metadata.

Summary by Sourcery

Release instantmenu v5.1.5 with updated package metadata, documentation, and changelog.

Enhancements:

• Document the v5.1.5 release, including emoji layout caching and improved X11 repaint input ordering.

Build:

• Bump the Cargo package and lockfile metadata to version 5.1.5.

Deployment:

• Update Arch Linux package metadata for version 5.1.5.

Documentation:

• Update the generated man page to report version 5.1.5.

[sourcery-ai]

Reviewer's Guide

This release-preparation PR versions the Rust package, lockfile, generated man page, and both Arch package variants at 5.1.5, while adding the corresponding changelog entry and release comparison metadata.

File-Level Changes

Change	Details	Files
Synchronize the project’s release version and generated documentation with v5.1.5.	Bump the Cargo package and lockfile metadata from 5.1.4 to 5.1.5. Update the generated man page title and displayed version.	Cargo.toml Cargo.lock instantmenu.1
Update release notes with the v5.1.5 date, comparison link, and accumulated changes.	Document emoji layout LRU retention and X11 repaint input-order preservation. Record additional merge and fix entries under the release notes.	CHANGELOG.md
Align Arch Linux packaging metadata with the new release.	Bump package versions for binary and source packages. Regenerate corresponding .SRCINFO metadata.	packaging/arch-bin/PKGBUILD packaging/arch-bin/.SRCINFO packaging/arch/PKGBUILD packaging/arch/.SRCINFO

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[sourcery-ai]

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

Sourcery assessment

Approved.

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