Add fallbackFont support

[Kyle-Ye]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 42 lines in your changes missing coverage. Please review.
✅ Project coverage is 30.04%. Comparing base (182cebe) to head (668aae8).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
...UICore/Data/Environment/EnvironmentAdditions.swift	0.00%	42 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #640      +/-   ##
==========================================
- Coverage   30.06%   30.04%   -0.03%     
==========================================
  Files         553      552       -1     
  Lines       33192    33220      +28     
==========================================
+ Hits         9979     9980       +1     
- Misses      23213    23240      +27     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.