gui canvas with rounded corners

canvas/src/gui/render.rs

@@ -5,7 +5,7 @@ use ratatui::{
     layout::{Alignment, Constraint, Direction, Layout, Rect},
     style::{Modifier, Style},
     text::{Line, Span},
-    widgets::{Block, Borders, Paragraph},
+    widgets::{Block, Borders, BorderType, Paragraph},
     Frame,
 };
 use crate::state::CanvasState;
@@ -80,6 +80,7 @@ where
     
     let input_container = Block::default()
         .borders(Borders::ALL)
+        .border_type(BorderType::Rounded)
         .border_style(border_style)
         .style(Style::default().bg(theme.bg()));