Fix ObservableExampleApp build issue for SUI

[Kyle-Ye]

No description provided.

[augmentcode]

🤖 Augment PR Summary

Summary: Fixes the ObservableExampleApp target failing to build when using SwiftUI by adjusting how imports are conditionally compiled.

Changes:

• Moves import OpenObservation inside the #if OPENSWIFTUI/#else branches so it’s consistently available alongside either OpenSwiftUI or SwiftUI.
• Removes the now-redundant unconditional import OpenObservation at the bottom of the import block.

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[augmentcode]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 13.71%. Comparing base (441a868) to head (cbbbef1).
⚠️ Report is 2 commits behind head on main.

❗ There is a different number of reports uploaded between BASE (441a868) and HEAD (cbbbef1). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (441a868)	HEAD (cbbbef1)
	2	1

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #803       +/-   ##
===========================================
- Coverage   27.63%   13.71%   -13.93%     
===========================================
  Files         657      622       -35     
  Lines       41224    37153     -4071     
===========================================
- Hits        11392     5094     -6298     
- Misses      29832    32059     +2227     

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