diagnostic: add check for excessive trailing empty lines in files

src/diagnostic.rs

@@ -721,6 +721,23 @@ impl StyleAnalyzer {
             }
         }
 
+        // Check for trailing empty lines at the end of the file
+        if empty_count > config.max_empty_lines {
+            let start = Position::new(empty_start as u32, 0);
+            let end = Position::new((empty_start + empty_count - 1) as u32, 0);
+            let range = Range::new(start, end);
+            let diagnostic = Diagnostic::new(
+                range,
+                DiagnosticSeverity::Warning,
+                DiagnosticCode::TooManyEmptyLines,
+                format!(
+                    "Too many consecutive empty lines at end of file ({} > {})",
+                    empty_count, config.max_empty_lines
+                ),
+            );
+            diagnostics.push(diagnostic);
+        }
+
         diagnostics
     }