chore: release v5.1.1

[github-actions]

Prepare v5.1.1.

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

Summary by Sourcery

Prepare the v5.1.1 release across package metadata, documentation, and distribution packaging.

Enhancements:

• Document the v5.1.1 changes, including improved font-run performance, unified menu-item acceptance, single-letter sizing, emoji handling, frecency behavior, and custom keybind support.

Build:

• Bump the Cargo package and lockfile metadata to v5.1.1.

Deployment:

• Update Arch Linux package metadata for v5.1.1.

Documentation:

• Regenerate the man page for v5.1.1 and clarify single-key output behavior.

Chores:

• Prepare the v5.1.1 release metadata and changelog.

[sourcery-ai]

Reviewer's Guide

This release-preparation PR synchronizes the project version at 5.1.1 across Cargo, generated documentation, and Arch packaging metadata, while adding the v5.1.1 changelog entry and documenting the revised single-key value/label behavior.

File-Level Changes

Change	Details	Files
Record the v5.1.1 release contents and date in the changelog.	Add the v5.1.1 comparison link, release date, and categorized change list.	CHANGELOG.md
Bump the Rust package version to 5.1.1 and synchronize the lockfile metadata.	Update the package version in Cargo metadata. Regenerate the corresponding Cargo.lock version entry.	Cargo.toml Cargo.lock
Regenerate the manual page for v5.1.1 and document updated single-key output behavior.	Update displayed version strings. Clarify that single-key mode prints value metadata when present, otherwise the label.	instantmenu.1
Synchronize Arch Linux package metadata with the new release.	Bump pkgver to 5.1.1 for source and binary packages. Update generated .SRCINFO metadata.	packaging/arch/PKGBUILD packaging/arch/.SRCINFO packaging/arch-bin/PKGBUILD packaging/arch-bin/.SRCINFO

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[sourcery-ai]

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

Sourcery assessment

Approved.

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