feat: Improve info table rendering by truncating wide columns

Co-authored-by: aider (openai/andrew/openrouter/deepseek/deepseek-chat-v3.1) <aider@aider.chat>

src/modes/common.rs

@@ -221,3 +221,57 @@ pub fn get_terminal_width() -> usize {
     // Default to 80 if all else fails
     80
 }
+
+/// Calculate the maximum width for the last column in a table
+/// Takes into account the widths of other columns and table borders
+pub fn calculate_last_column_width(column_widths: &[usize], terminal_width: usize) -> usize {
+    if terminal_width == 0 {
+        return 0;
+    }
+    
+    // Each column has 1 character padding on each side, and there are borders between columns
+    // The table format uses '│' characters between columns, which take 1 character each
+    let total_other_columns_width: usize = column_widths.iter().map(|&w| w + 2).sum();
+    let border_characters = column_widths.len().saturating_sub(1);
+    
+    // Total width used by other columns and their formatting
+    let used_width = total_other_columns_width + border_characters;
+    
+    if used_width >= terminal_width {
+        return 0;
+    }
+    
+    // The last column also has 2 characters for padding
+    terminal_width - used_width - 2
+}
+
+/// Truncate a string to fit within a maximum width, adding an ellipsis if truncated
+pub fn truncate_with_ellipsis(s: &str, max_width: usize) -> String {
+    if max_width == 0 {
+        return String::new();
+    }
+    
+    if s.chars().count() <= max_width {
+        return s.to_string();
+    }
+    
+    // We need to truncate and add an ellipsis
+    // The ellipsis takes 1 character, so we can show max_width-1 characters
+    if max_width == 1 {
+        return "…".to_string();
+    }
+    
+    let mut result = String::new();
+    let mut current_width = 0;
+    
+    for c in s.chars() {
+        if current_width + 1 > max_width - 1 {
+            break;
+        }
+        result.push(c);
+        current_width += 1;
+    }
+    
+    result.push('…');
+    result
+}