Fix unbounded intensity cache issue

[Kyle-Ye]

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[augmentcode]

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[augmentcode]

host is weak, so host! can crash on a cache miss if this cache outlives the hosting view. Consider returning nil (or otherwise no-op) when host is nil before calling addInteraction(_:).

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 13.84%. Comparing base (75dff0e) to head (9a87c72).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #671   +/-   ##
=======================================
  Coverage   13.84%   13.84%           
=======================================
  Files         558      558           
  Lines       32492    32492           
=======================================
+ Hits         4499     4500    +1     
+ Misses      27993    27992    -1     

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