feat(wm): add theme socket message

This commit adds a new SocketMessage::Theme which allows for themes to
be set programmatically. This change has also been plumbed through to
komorebi-bar so that the bar theme will also update after komorebi
processes the message and passes it on to subscribers.

A new theme_manager module has been introduced to add notification-based
handling of theme changes, both from the static config file being
updated and from SocketMessage::Theme being received.

komorebi-bar/src/config.rs

@@ -136,11 +136,13 @@ impl From<Position> for Pos2 {
 pub enum KomobarTheme {
     /// A theme from catppuccin-egui
     Catppuccin {
+        /// Name of the Catppuccin theme (theme previews: https://github.com/catppuccin/catppuccin)
         name: komorebi_themes::Catppuccin,
         accent: Option<komorebi_themes::CatppuccinValue>,
     },
     /// A theme from base16-egui-themes
     Base16 {
+        /// Name of the Base16 theme (theme previews: https://tinted-theming.github.io/base16-gallery)
         name: komorebi_themes::Base16,
         accent: Option<komorebi_themes::Base16Value>,
     },