Fix ruff issues: remove unused variables and empty comments

- Remove empty comment in git_time_tracker/format/cli.py:61
- Remove unused max_title_parts in git_time_tracker/format/icalendar.py:28
- Remove unused max_title_parts in git_time_tracker/source/csv_file.py:14

🤖 Generated with [Claude Code](https://claude.ai/code)

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

git_time_tracker/format/cli.py

@@ -57,8 +57,6 @@ def generate_report(
 
     time_and_label = [(duration, label) for label, duration in time_per_label.items()]
     time_and_label.sort(reverse=True)
-
-    #
     yield '-' * LINE_LENGTH
     yield '\n'
     for total_time, label in time_and_label:

git_time_tracker/format/icalendar.py

@@ -25,8 +25,6 @@ def create_title(sample: RealizedActivitySample) -> tuple[str, str]:
 def generate_calendar(
     samples: list[RealizedActivitySample],
 ) -> icalendar.Calendar:
-    max_title_parts = 2
-
     cal = icalendar.Calendar()
     cal.add('prodid', '-//personal_data_calendar//example.org//')
     cal.add('version', '2.0')

git_time_tracker/source/csv_file.py

@@ -11,7 +11,6 @@ logger = getLogger(__name__)
 
 def iterate_samples_from_dicts(rows: list[dict[str, Any]]) -> Iterator[ActivitySample]:
     assert len(rows) > 0
-    max_title_parts = 2
 
     if True:
         event_data = rows[len(rows) // 2]  # Hopefully select a useful representative.