working perfectly well

client/src/components/handlers/sidebar.rs

@@ -1,13 +1,30 @@
 // src/components/handlers/sidebar.rs
 use ratatui::{
     widgets::{Block, List, ListItem},
-    layout::Rect,
+    layout::{Rect, Direction, Layout, Constraint},
     style::Style,
     text::Text,
     Frame,
 };
 use crate::config::colors::Theme;
 
+const SIDEBAR_WIDTH: u16 = 16;
+
+pub fn calculate_sidebar_layout(show_sidebar: bool, main_content_area: Rect) -> (Option<Rect>, Rect) {
+    if show_sidebar {
+        let chunks = Layout::default()
+            .direction(Direction::Horizontal)
+            .constraints([
+                Constraint::Length(SIDEBAR_WIDTH),
+                Constraint::Min(0),
+            ])
+            .split(main_content_area);
+        (Some(chunks[0]), chunks[1])
+    } else {
+        (None, main_content_area)
+    }
+}
+
 pub fn render_sidebar(f: &mut Frame, area: Rect, theme: &Theme) {
     let sidebar_block = Block::default()
         .style(Style::default().bg(theme.bg));