perf: reduce package and drawing bundle size

[ghiscoding]

Summary

• Publish only compiled dist files in the npm package.
• Remove runtime dependencies on Chart and Picture from Drawings.
• Use the drawing interface to resolve relationship targets, allowing unused
  drawing implementations to be tree-shaken.
• Preserve the existing ESM-only package format and source maps.
• Strengthen drawing relationship regression tests.

Size impact

• npm package: 109,334 → 74,819 bytes (~32% smaller)
• Drawings: 4.93 → 1.96 kB gzip
• Drawings + Picture: 4.93 → 2.99 kB gzip
• Factory with picture drawings: 13.68 → 11.78 kB gzip
• Complete build: 67.49 → 67.34 kB

The complete root bundle has a smaller reduction because it intentionally
exports every drawing implementation. Consumers importing individual APIs
receive the larger tree-shaking improvements.

Testing

• 270 unit tests passed
• 100% statement, function, and line coverage
• 22 real-browser XLSX export tests passed
• Picture and chart relationship targets are explicitly tested
• TypeScript type-check passed
• Biome checks passed
• Production package build passed
• Packed npm contents verified

AI assistance

Bundle analysis, implementation assistance, and verification were performed
using OpenAI Codex (GPT-5.6 Sol). The resulting changes were reviewed and accepted
by the maintainer.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.0%. Comparing base (1b0abaa) to head (83a109f).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #216   +/-   ##
=======================================
  Coverage   100.0%   100.0%           
=======================================
  Files          25       25           
  Lines        1887     1882    -5     
  Branches      373      372    -1     
=======================================
- Hits         1887     1882    -5     

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[github-actions]

🎉 This pull request is included in version 5.2.4 📦
🔗 The release notes are available at: GitHub Release 🚀