Add overflow handling to system and backup widgets

Restore "... and X more" indicators when panel content doesn't fit:
- System widget: Shows overflow for storage pools when area is too small
- Backup widget: Shows overflow for repository list when area is too small
- Maintains consistent formatting with existing services widget overflow

dashboard/src/ui/widgets/backup.rs

@@ -390,15 +390,37 @@ impl Widget for BackupWidget {
             ratatui::text::Span::styled("Repos:", Typography::widget_title())
         ]));
 
-        // Repository list
+        // Repository list with overflow handling
+        let remaining_space = area.height.saturating_sub(lines.len() as u16);
+        let mut repo_lines = Vec::new();
+        
         for service in &self.service_metrics {
             if let (Some(archives), Some(size_gb)) = (service.archive_count, service.repo_size_gb) {
                 let size_str = Self::format_size_with_proper_units(size_gb);
                 let repo_text = format!("{} ({}) {}", service.name, archives, size_str);
                 let repo_spans = StatusIcons::create_status_spans(service.status, &repo_text);
-                lines.push(ratatui::text::Line::from(repo_spans));
+                repo_lines.push(ratatui::text::Line::from(repo_spans));
             }
         }
+        
+        if repo_lines.len() <= remaining_space as usize {
+            // All repos fit
+            lines.extend(repo_lines);
+        } else if remaining_space >= 2 {
+            // Show what we can and add overflow indicator
+            let lines_to_show = (remaining_space - 1) as usize; // Reserve 1 line for overflow
+            lines.extend(repo_lines.iter().take(lines_to_show).cloned());
+            
+            let hidden_repos = repo_lines.len() - lines_to_show;
+            let overflow_text = format!(
+                "... and {} more repo{}",
+                hidden_repos,
+                if hidden_repos == 1 { "" } else { "s" }
+            );
+            lines.push(ratatui::text::Line::from(vec![
+                ratatui::text::Span::styled(overflow_text, Typography::muted())
+            ]));
+        }
 
         let paragraph = Paragraph::new(ratatui::text::Text::from(lines));
         frame.render_widget(paragraph, area);

dashboard/src/ui/widgets/system.rs

@@ -466,11 +466,50 @@ impl Widget for SystemWidget {
             Span::styled("Storage:", Typography::widget_title())
         ]));
         
-        // Storage items
-        lines.extend(self.render_storage());
+        // Storage items with overflow handling
+        let storage_lines = self.render_storage();
+        let remaining_space = area.height.saturating_sub(lines.len() as u16);
+        
+        if storage_lines.len() <= remaining_space as usize {
+            // All storage lines fit
+            lines.extend(storage_lines);
+        } else if remaining_space >= 2 {
+            // Show what we can and add overflow indicator
+            let lines_to_show = (remaining_space - 1) as usize; // Reserve 1 line for overflow
+            lines.extend(storage_lines.iter().take(lines_to_show).cloned());
+            
+            // Count hidden pools
+            let mut hidden_pools = 0;
+            let mut current_pool = String::new();
+            for (i, line) in storage_lines.iter().enumerate() {
+                if i >= lines_to_show {
+                    // Check if this line represents a new pool (no indentation)
+                    if let Some(first_span) = line.spans.first() {
+                        let text = first_span.content.as_ref();
+                        if !text.starts_with("  ") && text.contains(':') {
+                            let pool_name = text.split(':').next().unwrap_or("").trim();
+                            if pool_name != current_pool {
+                                hidden_pools += 1;
+                                current_pool = pool_name.to_string();
+                            }
+                        }
+                    }
+                }
+            }
+            
+            if hidden_pools > 0 {
+                let overflow_text = format!(
+                    "... and {} more pool{}",
+                    hidden_pools,
+                    if hidden_pools == 1 { "" } else { "s" }
+                );
+                lines.push(Line::from(vec![
+                    Span::styled(overflow_text, Typography::muted())
+                ]));
+            }
+        }
 
         let paragraph = Paragraph::new(Text::from(lines));
-
         frame.render_widget(paragraph, area);
     }
 }