memory optimisation

src/search.rs

@@ -141,13 +141,10 @@ fn search_lines(
             // Read lines in this chunk efficiently (one seek, sequential reads)
             let lines = line_index.read_line_range(&mut file_handle, *start, *end);
 
-            // Process each line
+            // Process each line - only store line numbers, not content
             for (line_number, content) in lines {
                 if params.matches_line(&content, &regex_matcher) {
-                    chunk_results.push(FilteredLine {
-                        line_number,
-                        content,
-                    });
+                    chunk_results.push(FilteredLine { line_number });
                 }
             }