chore: release v4.1.0

[InioX]

🤖 New release

• matugen: 4.0.0 -> 4.1.0

Changelog

4.1.0 - 2026-03-22

Added

• add contrast config option (fixes [feature request] Add config option for --contrast #274)
• add info when executing pre_hook for wallpaper
• only show stout/stderr if not empty
• add jxl image support (fixes [Feature request] Add jpegxl/jxl support #268)
• add per template scheme types (#261)
• add stdout and stderr for commands (fixes Print output of config.wallpaper command in debug mode #227)
• add --opacity flag (#238)
• add error when using set_format on a color without alpha (fixes Filter set_alpha silently fails on colors that don't support alpha #266)
• add alpha_hex and alpha_hex_stripped (closes Support for Alpha Hex (#AARRGGBB) #260)

Fixed

• do not use Stdio::piped() for commands (#270)
• canonicalize the image path (#273)
• change description for --old-json-output
• format new json output (#267)
• add format into color filters category
• update nix flake to allow building again
• turn source_color_index comment into a doc comment
• use comfy-table to print colors table instead of prettytable-rs
• (base16) use image with guessed format (fixes Image with non-standard extension causes errors #258)

Other

• change nixos version badge to unstable
• update arch installation (#269)
• merge format_color and format_color_hsl into one
• add website theming
• Merge pull request feat: prefer color option #264 from zeptofine/feat/prefer-color-option

---

This PR was generated with release-plz.

[VuiMuich]

Hi, the nix version tag in the readme seems vastly outdated, it points to the 24.05 stable release, I would like to suggest to also add the tag for the unstable channel as well.

[InioX]

Hi, the nix version tag in the readme seems vastly outdated, it points to the 24.05 stable release, I would like to suggest to also add the tag for the unstable channel as well.

Do you mean the button showing the current version? I'll change it