Fix plot_daily for missing dates and add timezone/DST tests

[staskh]

Summary

This PR fixes a bug in plot_daily that caused a KeyError when processing timeseries with missing dates, and adds comprehensive unittests for timezone-aware data and DST transitions.

Changes

Bug Fix

• Fixed plot_daily to handle timeseries with missing dates correctly
• Changed from resample('D') to groupby(normalize()) to only include days with data
• Prevents KeyError when trying to get groups for days without data

Tests Added

• Test missing dates (non-continuous timeseries)
• Test multiple missing dates
• Test single day in middle of range
• Test timezone-aware (non-UTC) timeseries
• Test DST spring forward (losing an hour)
• Test DST fall back (gaining an hour)

Version

• Bumped version to 0.4.3

Testing

All existing tests pass, and new tests verify the functionality works correctly with:

• Missing dates
• Timezone-aware data
• DST transitions in both directions

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.38%. Comparing base (1c7a730) to head (17cb51d).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.
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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #18      +/-   ##
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+ Coverage   90.37%   90.38%   +0.01%     
==========================================
  Files          46       46              
  Lines        1797     1799       +2     
==========================================
+ Hits         1624     1626       +2     
  Misses        173      173              

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