feat: add option to draw rectangle with start and end points

[gmorador-tribu]

Added support for creating rectangle annotations using two clicks to define the start and end points. Existing functionality remains unchanged.

[codecov]

Codecov Report

❌ Patch coverage is 96.15385% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 99.48%. Comparing base (5589e5c) to head (5660e06).

Files with missing lines	Patch %	Lines
src/annotator/draw-tool.tsx	96.15%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7489      +/-   ##
==========================================
- Coverage   99.50%   99.48%   -0.02%     
==========================================
  Files         271      271              
  Lines       11027    11076      +49     
  Branches     2656     2666      +10     
==========================================
+ Hits        10972    11019      +47     
- Misses         55       57       +2     

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