fix(operation): report actual file total_lines instead of content slice line count (#2771)

Author: tusharmath

crates/forge_app/src/operation.rs

@@ -271,7 +271,7 @@ impl ToolOperation {
                         "display_lines",
                         format!("{}-{}", output.info.start_line, output.info.end_line),
                     )
-                    .attr("total_lines", content.lines().count())
+                    .attr("total_lines", output.info.total_lines)
                     .cdata(content);
 
                 // Track read operations

crates/forge_app/src/snapshots/forge_app__operation__tests__fs_read_with_explicit_range.snap

@@ -5,7 +5,7 @@ expression: to_value(actual)
 <file
   path="/home/user/test.txt"
   display_lines="2-3"
-  total_lines="3"
+  total_lines="5"
 ><![CDATA[2:Line 1
 3:Line 2
 4:Line 3]]>

crates/forge_app/src/snapshots/forge_app__operation__tests__fs_read_with_truncation_path.snap

@@ -5,6 +5,6 @@ expression: to_value(actual)
 <file
   path="/home/user/large_file.txt"
   display_lines="1-100"
-  total_lines="1"
+  total_lines="200"
 ><![CDATA[1:Truncated content]]>
 </file>