Feat: begin sample explorer overhaul

crates/ratatui/src/sample_browser.rs

@@ -23,6 +23,7 @@ pub struct TreeLine {
     pub label: String,
     pub folder: String,
     pub index: usize,
+    pub child_count: usize,
 }
 
 /// Tree-view browser for navigating sample folders.
@@ -163,15 +164,43 @@ impl<'a> SampleBrowser<'a> {
                 Style::new().fg(icon_color)
             };
 
+            let prefix_width = indent.len() + 2; // indent + icon
+            let suffix = match entry.kind {
+                TreeLineKind::File => format!(" {}", entry.index),
+                TreeLineKind::Root { expanded: false }
+                | TreeLineKind::Folder { expanded: false }
+                    if entry.child_count > 0 =>
+                {
+                    format!("  ({})", entry.child_count)
+                }
+                _ => String::new(),
+            };
+            let max_label = (area.width as usize)
+                .saturating_sub(prefix_width)
+                .saturating_sub(suffix.len());
+            let label: std::borrow::Cow<str> = if entry.label.len() > max_label && max_label > 1 {
+                let truncated: String = entry.label.chars().take(max_label - 1).collect();
+                format!("{}\u{2026}", truncated).into()
+            } else {
+                (&entry.label).into()
+            };
+
             let mut spans = vec![
                 Span::raw(indent),
                 Span::styled(icon, icon_style),
-                Span::styled(&entry.label, label_style),
+                Span::styled(label, label_style),
             ];
 
-            if matches!(entry.kind, TreeLineKind::File) {
-                let idx_style = Style::new().fg(colors.browser.empty_text);
-                spans.push(Span::styled(format!(" {}", entry.index), idx_style));
+            match entry.kind {
+                TreeLineKind::File => {
+                    let idx_style = Style::new().fg(colors.browser.empty_text);
+                    spans.push(Span::styled(suffix, idx_style));
+                }
+                _ if !suffix.is_empty() => {
+                    let dim_style = Style::new().fg(colors.browser.empty_text);
+                    spans.push(Span::styled(suffix, dim_style));
+                }
+                _ => {}
             }
 
             lines.push(Line::from(spans));