Feat: entretien de la codebase

crates/ratatui/src/scroll_indicators.rs

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+use ratatui::layout::Rect;
+use ratatui::style::{Color, Style};
+use ratatui::widgets::Paragraph;
+use ratatui::Frame;
+
+pub enum IndicatorAlign {
+    Center,
+    Right,
+}
+
+pub fn render_scroll_indicators(
+    frame: &mut Frame,
+    area: Rect,
+    offset: usize,
+    visible: usize,
+    total: usize,
+    color: Color,
+    align: IndicatorAlign,
+) {
+    let style = Style::new().fg(color);
+
+    match align {
+        IndicatorAlign::Center => {
+            if offset > 0 {
+                let indicator = Paragraph::new("▲")
+                    .style(style)
+                    .alignment(ratatui::layout::Alignment::Center);
+                frame.render_widget(indicator, Rect { height: 1, ..area });
+            }
+            if offset + visible < total {
+                let y = area.y + area.height.saturating_sub(1);
+                let indicator = Paragraph::new("▼")
+                    .style(style)
+                    .alignment(ratatui::layout::Alignment::Center);
+                frame.render_widget(indicator, Rect { y, height: 1, ..area });
+            }
+        }
+        IndicatorAlign::Right => {
+            let x = area.x + area.width.saturating_sub(1);
+            if offset > 0 {
+                let indicator = Paragraph::new("▲").style(style);
+                frame.render_widget(indicator, Rect::new(x, area.y, 1, 1));
+            }
+            if offset + visible < total {
+                let indicator = Paragraph::new("▼").style(style);
+                frame.render_widget(
+                    indicator,
+                    Rect::new(x, area.y + area.height.saturating_sub(1), 1, 1),
+                );
+            }
+        }
+    }
+}