Updates in legend

[hanjinliu]

• Name filter.
• Improve the legend title positions.

[codecov]

Codecov Report

Attention: Patch coverage is 81.48148% with 10 lines in your changes missing coverage. Please review.

Project coverage is 83.32%. Comparing base (81ae136) to head (87babb7).
Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
whitecanvas/layers/_primitive/line.py	65.00%	2 Missing and 5 partials ⚠️
whitecanvas/layers/group/_collections.py	50.00%	1 Missing and 1 partial ⚠️
tests/test_logics.py	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #58      +/-   ##
==========================================
- Coverage   83.34%   83.32%   -0.03%     
==========================================
  Files         195      196       +1     
  Lines       21168    21195      +27     
  Branches     3436     3440       +4     
==========================================
+ Hits        17643    17660      +17     
- Misses       2597     2608      +11     
+ Partials      928      927       -1     

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