WIP: feat(icon): Support OS26 icon composer bundles

[dpogue]

Platforms affected

iOS

Motivation and Context

Xcode 26 and iOS 26 support a new .icon bundle format from Icon Composer.

Description

Check for icon definitions that have a .icon extension and copy them into the project as resources.

Remaining Work

• Copy icons into the project
• Clean icons from the project
• Unit tests

Testing

Tested manually in an Xcode 26 project.

Checklist

• I've run the tests to see all new and existing tests pass
• I added automated test coverage as appropriate for this change

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 33 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.76%. Comparing base (3961bdb) to head (6106c3d).
⚠️ Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
lib/prepare.js	0.00%	33 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1568      +/-   ##
==========================================
+ Coverage   78.74%   78.76%   +0.01%     
==========================================
  Files          17       17              
  Lines        4911     4939      +28     
==========================================
+ Hits         3867     3890      +23     
- Misses       1044     1049       +5     

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