fix: resolve all basedpyright warnings

- Use collections.abc.Generator/Iterable instead of deprecated typing imports
- Replace Optional with union syntax (X | None)
- Add explicit type annotations to eliminate reportUnknownVariableType
- Use typing.cast for untyped mistletoe attributes (content, level, line_number)
- Replace mutable default arguments with None defaults (reportCallInDefaultInitializer)
- Add ClassVar annotation for model_config (reportIncompatibleVariableOverride)
- Add @override decorator for settings_customise_sources (reportImplicitOverride)
- Annotate class attributes in Tag (reportUnannotatedClassAttribute)
- Add parameter type annotations in test (reportMissingParameterType)
- Assign unused call result to _ (reportUnusedCallResult)

test/timesheet/test_extract_timesheets.py

@@ -4,13 +4,13 @@ from datetime import datetime, time
 
 import pytest
 
-from streamer.localize.localized_shard import LocalizedShard
-from streamer.timesheet.configuration import (
+from streamd.localize.localized_shard import LocalizedShard
+from streamd.timesheet.configuration import (
     TIMESHEET_DIMENSION_NAME,
     TimesheetPointType,
 )
-from streamer.timesheet.extract import extract_timesheets
-from streamer.timesheet.timecard import SpecialDayType, Timecard, Timesheet
+from streamd.timesheet.extract import extract_timesheets
+from streamd.timesheet.timecard import SpecialDayType, Timecard, Timesheet
 
 
 def point(at: datetime, type: TimesheetPointType) -> LocalizedShard:
@@ -243,7 +243,7 @@ class TestExtractTimesheets:
         ]
 
         with pytest.raises(ValueError, match=r"Last Timecard of .* is not a break"):
-            extract_timesheets(shards)
+            _ = extract_timesheets(shards)
 
     def test_two_special_day_types_same_day_is_invalid(self):
         """
@@ -257,7 +257,7 @@ class TestExtractTimesheets:
         ]
 
         with pytest.raises(ValueError, match=r"is both .* and .*"):
-            extract_timesheets(shards)
+            _ = extract_timesheets(shards)
 
     def test_points_with_mixed_dates_inside_one_group_raises(self):
         """
@@ -273,7 +273,7 @@ class TestExtractTimesheets:
         ]
 
         with pytest.raises(ValueError, match=r"Last Timecard of .* is not a break"):
-            extract_timesheets(shards)
+            _ = extract_timesheets(shards)
 
     def test_day_with_only_breaks_is_ignored(self):
         """