feat(xlsx): make Excel export production-grade

- Add merge cells for project/version groups.
- Add numeric Hours column and human-readable Spent Time.
- Add version/project/grand totals.
- Apply auto-width, freeze panes, auto-filter and styling.
- Respect --no-time: keep columns empty, skip totals.
- Pass no_time flag through formatter factory to all file formatters.
- Add tests for XLSX features and --no-time behavior.

Closes #38

redmine_reporter/formatters/odt.py

@@ -15,7 +15,7 @@ from .base import Formatter
 class ODTFormatter(Formatter):
     """Форматтер для экспорта в ODT."""
 
-    def __init__(self, author: str = "", from_date: str = "", to_date: str = ""):
+    def __init__(self, author: str = "", from_date: str = "", to_date: str = "", **_kwargs):
         """
         Инициализирует форматтер с параметрами для шапки отчета.
         """