selection ui change

src/main.rs

@@ -12,6 +12,7 @@ use ratatui::{
     layout::{Constraint, Layout, Rect, Spacing},
     symbols::merge::MergeStrategy,
     widgets::{Block, List, ListItem, ListState, Paragraph},
+    style::{Modifier, Style},
     Frame, Terminal,
 };
 use ratatui::backend::CrosstermBackend;
@@ -84,7 +85,7 @@ fn run_app(terminal: &mut Terminal<CrosstermBackend<io::Stdout>>) -> io::Result<
             // tick-based updates go here later (smooth nav, download polling, etc.)
             last_tick = Instant::now();
         }
-    };
+    }
     Ok(())
 }
 
@@ -93,19 +94,24 @@ fn handle_key(app: &mut App, code: KeyCode) {
         KeyCode::Char('q') => app.should_exit = true,
 
         KeyCode::Up | KeyCode::Char('k') => {
-            if app.selected > 0 {
+            if app.items.is_empty() {
+                return;
+            }
+            if app.selected == 0 {
+                app.selected = app.items.len() - 1;
+            } else {
                 app.selected -= 1;
             }
             app.status = format!("Selected: {}", app.items[app.selected]);
         }
 
         KeyCode::Down | KeyCode::Char('j') => {
-            if app.selected + 1 < app.items.len() {
+            if app.items.is_empty() {
-                app.selected += 1;
+                return;
             }
+            app.selected = (app.selected + 1) % app.items.len();
             app.status = format!("Selected: {}", app.items[app.selected]);
         }
-
         _ => {}
     }
 }
@@ -126,7 +132,8 @@ fn ui(frame: &mut Frame, app: &App) {
 
     let list = List::new(items)
         .block(Block::bordered().title("List").merge_borders(MergeStrategy::Exact))
-        .highlight_symbol("> ");
+        .highlight_symbol("> ")
+        .highlight_style(Style::default().add_modifier(Modifier::REVERSED));
 
     let mut state = ListState::default();
     state.select(Some(app.selected));