fix: use correct Plugin type import

[LouisHaftmann]

fixes#423

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[danielroe]

Thank you! ❤️

However, #app is the correct location to import Plugin from, so I will need to investigate why it's being stripped from the build output types.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (68b2832) 83.36% compared to head (03ebce7) 83.36%.
Report is 22 commits behind head on main.

❗ Current head 03ebce7 differs from pull request most recent head 400e142. Consider uploading reports for the commit 400e142 to get more accurate results

Additional details and impacted files

@@ Coverage Diff @@## main #478 +/- ##
=======================================
Coverage 83.36% 83.36% =======================================
Files 9 9 Lines 493 493 Branches 30 30 =======================================
Hits 411 411 Misses 82 82 

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