Sync iTerm palettes with upstream

[nanxstats]

This PR runs tools/update_iterm_palettes.R to sync the iTerm palettes with upstream.

New palettes added for iterm_palettes() (and thus pal_iterm(), scale_color_iterm(), scale_fill_iterm()):

• branch
• No Clown Fiesta Light
• No Clown Fiesta
• novmbr
• One Dark Two
• owl
• traffic
• urban

[Copilot]

Pull request overview

This PR synchronizes iTerm color palettes with upstream by running the tools/update_iterm_palettes.R script. The update adds 8 new color palettes to the ggsci package, making them available through iterm_palettes(), pal_iterm(), scale_color_iterm(), and scale_fill_iterm() functions.

Key Changes:

• Added 8 new iTerm color palettes: branch, No Clown Fiesta (2 variations), novmbr, One Dark Two, owl, traffic, and urban
• Each palette includes both "normal" and "bright" color variants with 6 colors each (Blue, Yellow, Red, Cyan, Green, Magenta)
• Incidental code formatting improvements to several function definitions

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
R/palettes-iterm.R	Added 8 new palette names to iterm_palettes() function and corresponding color definitions for each palette's normal and bright variants
R/discrete-cosmic.R	Reformatted function parameter layout for pal_cosmic(), scale_color_cosmic(), and scale_fill_cosmic()
R/continuous-tw3.R	Reformatted function parameter layout for rgb_tw3(), pal_tw3(), scale_color_tw3(), and scale_fill_tw3()
R/continuous-material.R	Reformatted function parameter layout for rgb_material(), pal_material(), scale_color_material(), and scale_fill_material()
R/continuous-bs5.R	Reformatted function parameter layout for rgb_bs5(), pal_bs5(), scale_color_bs5(), and scale_fill_bs5()
NEWS.md	Added version 4.2.0 release notes documenting the addition of 8 new iTerm palettes

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