Feat: WIP terse code documentation

crates/markdown/src/theme.rs

@@ -1,5 +1,8 @@
+//! Style provider trait for markdown rendering.
+
 use ratatui::style::{Color, Modifier, Style};
 
+/// Style provider for each markdown element type.
 pub trait MarkdownTheme {
     fn h1(&self) -> Style;
     fn h2(&self) -> Style;
@@ -16,6 +19,7 @@ pub trait MarkdownTheme {
     fn table_row_odd(&self) -> Color;
 }
 
+/// Fallback theme with hardcoded terminal colors, used in tests.
 pub struct DefaultTheme;
 
 impl MarkdownTheme for DefaultTheme {