Feat: add hidden mode and new documentation

crates/ratatui/src/theme/transform.rs

@@ -1,3 +1,5 @@
+//! Hue rotation for palette-wide color transforms.
+
 use super::palette::{Palette, Rgb};
 use super::build::build;
 use super::ThemeColors;
@@ -62,6 +64,7 @@ fn rotate3(arr: [Rgb; 3], d: f32) -> [Rgb; 3] {
     [rotate(arr[0], d), rotate(arr[1], d), rotate(arr[2], d)]
 }
 
+/// Build a [`ThemeColors`] with all palette hues rotated by `degrees`.
 pub fn rotate_palette(palette: &Palette, degrees: f32) -> ThemeColors {
     if degrees == 0.0 {
         return build(palette);