chore: release v4.2.0

[InioX]

🤖 New release

• matugen: 4.1.0 -> 4.2.0

Changelog

4.2.0 - 2026-08-05

Added

• add scheme-smart and smart mode to nixos module
• smart scheme variant type and smart mode
• add source_color_index to config (closes config #289)
• add cache for per template scheme types (#292)

Fixed

• remove -D warnings from clippy CI step to unblock on pre-existing warnings
• high-priority code quality improvements
• change ordering for base16 accents from image (Base 16 colors are all the same #286, Base 16 colors are all same from 09 to 0f for color output #283)

Other

• Merge pull request fix: (nix) update deprecated system usage #311 from joaosreis/patch-1
• Replace debug panic in template engine
• Fix grayscale filter on HSL colors
• Remove unused quantizer_kmeans module
• Remove dead exec module
• format
• add enabled key
• Merge pull request fix: expand tilde in hook commands for cross-platform support #290 from haikalllp/fix/tildeUsageOnHooks
• remove indices from show_source_colors output
• make listing source colors an arg for image instead of a different command
• added new image-colors command to list possible source colors from image
• use swap_remove to remove warning
• cargo fmt
• cli_overides cont.
• SchemeType-specific cache (#295)
• move cli overrides to a dedicated function

Removed

• removed unnecessary import

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This PR was generated with release-plz.