style(project): 🎨 improve all docstrings and centralize mail variables in mail_utils

tests/test_mail_reader.py

@@ -110,7 +110,7 @@ class OkProtocol:
 class OkAccount:
     """Account with a protocol that returns a version successfully."""
 
-    def __init__(self):  # noqa: D102
+    def __init__(self):  # noqa: D107
         self.protocol = OkProtocol()
 
 
@@ -380,7 +380,7 @@ def test_fetch_log_messages_folder_path(make_mock_account):
 # extract_log_lines(content) #
 ##############################
 def test_extract_log_lines_split_and_clean(original_log_dir: Path):
-    """Splits content, strips \r\n, removes empty lines."""
+    r"""Split content, strips '\r\n', removes empty lines."""
     file = original_log_dir / "CR_20260727110008.txt"
     content = file.read_text(encoding="windows-1252")
     lines = extract_log_lines(content)
@@ -412,7 +412,7 @@ def test_extract_log_lines_no_trailing_newline():
 
 
 def test_extract_log_lines_crlf():
-    """Handles Windows \r\n line endings."""
+    r"""Handles Windows \r\n line endings."""
     content = (
         "Répertoire scanné : \\192.168.60.40\\e$\\MDC_1110\\Logs\n"
         "\\192.168.60.40\\e$\\MDC_1110\\Logs\\26\\07\\27\\20260727083117.txt [27/07/2026 08:31:26] DOSSIER EN COURS : FLAMMIER [27/07/2026 08:31:53] Erreur FTP commande : Requested action not taken\r\n"