fix diff file

src/ai_reviewer/diff.py

@@ -61,7 +61,7 @@ def run_git_diff(repo: str, base: str, head: str) -> str:
 def parse_diff(diff_text: str) -> list[FileDiff]:
     files: list[FileDiff] = []
     current_path: str | None = None
-    header_ lines: list[str] = []
+    header_lines: list[str] = []
     hunks: list[Hunk] = []
     current_hunk_header: str | None = None
     current_hunk_lines: list[str] = []
@@ -89,9 +89,9 @@ def parse_diff(diff_text: str) -> list[FileDiff]:
         if line.startswith("diff --git "):
             flush_file()
             header_lines = [line]
-            p = line.split()
-            if len(parts) >= 4 and p[3].startswith("b/"):
-                current_path = p[3][len("b/") :]
+            parts = line.split()
+            if len(parts) >= 4 and parts[3].startswith("b/"):
+                current_path = parts[3][len("b/") :]
             else:
                 current_path = None
             continue