fix(hashing): address trunk lint issues in composite archive hashing

- Use AnyioPath.stat() instead of os.path.getmtime in async context (ASYNC240)
- Add assert to narrow rom_md5_h/rom_sha1_h from HASH|None to HASH (mypy/union-attr)
- Auto-formatted long log.error calls in archive_7zip.py (ruff)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/handler/filesystem/roms_handler.py

@@ -678,7 +678,8 @@ class FSRomsHandler(FSHandler):
                 )
 
             if archive_entries:
-                archive_mtime = os.path.getmtime(rom_dir)
+                archive_mtime = (await AnyioPath(rom_dir).stat()).st_mtime
+                assert rom_md5_h is not None and rom_sha1_h is not None
                 for internal_name, entry_size, chunks in archive_entries:
                     crc_c = 0
                     md5_h = hashlib.md5(usedforsecurity=False)

backend/utils/archive_7zip.py

@@ -117,7 +117,11 @@ def read_7z_archive_files(
             timeout=SEVEN_ZIP_TIMEOUT,
             shell=False,  # trunk-ignore(bandit/B603)
         )
-    except (subprocess.TimeoutExpired, subprocess.CalledProcessError, FileNotFoundError) as e:
+    except (
+        subprocess.TimeoutExpired,
+        subprocess.CalledProcessError,
+        FileNotFoundError,
+    ) as e:
         log.error(f"Error listing 7z archive {file_path}: {e}")
         return []
 
@@ -169,11 +173,15 @@ def read_7z_archive_files(
                     while chunk := process.stdout.read(FILE_READ_CHUNK_SIZE):
                         if time.monotonic() - start_time > SEVEN_ZIP_TIMEOUT:
                             process.terminate()
-                            log.error("7z extraction timed out during multi-file archive read")
+                            log.error(
+                                "7z extraction timed out during multi-file archive read"
+                            )
                             return output
                         chunks.append(chunk)
             if process.returncode != 0:
-                log.error(f"7z extraction of {name} failed with code {process.returncode}")
+                log.error(
+                    f"7z extraction of {name} failed with code {process.returncode}"
+                )
                 continue
         except (OSError, ValueError) as e:
             log.error(f"Error extracting {name} from {file_path}: {e}")