feat(filter): add 'primary' filter

[linrongbin16]

No description provided.

[codecov]

Codecov Report

Attention: 38 lines in your changes are missing coverage. Please review.

Comparison is base (0e7a564) 20.41% compared to head (027041f) 16.92%.

Files	Patch %	Lines
lua/colorbox.lua	0.00%	38 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #21      +/-   ##
==========================================
- Coverage   20.41%   16.92%   -3.50%     
==========================================
  Files           3        3              
  Lines         240      260      +20     
==========================================
- Hits           49       44       -5     
- Misses        191      216      +25     

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