Add Shared assets for Example project

[Kyle-Ye]

No description provided.

[augmentcode]

🤖 Augment PR Summary

Summary: This PR consolidates shared Example assets and source files into a new Example/Shared folder to be reused across the sample apps and UI tests.

Changes:

• Renames SharedExample → Shared and updates file headers accordingly.
• Moves app icons, colors, and images into a shared Assets.xcassets under Example/Shared/Assets and removes per-target asset catalog files.
• Updates snapshot/UI tests to reuse shared example views (e.g. ForEachOffsetExample, ForEachKeyPathExample).
• Wires the Shared folder into the TestingHost target via file-system synchronized groups.
• Adds the Equatable SwiftPM product to TestingHost and OpenSwiftUIUITests to support shared demo views.

Technical Notes: Xcode project settings are adjusted to reflect the new shared structure and dependencies.

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[augmentcode]

Review completed. 1 suggestion posted.

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[augmentcode]

By adding the Shared synchronized group to TestingHost, this also changes which Shared sources get built into the test host (notably interpose.c, which interposes swift_dynamicCast/kdebug_is_enabled). Worth double-checking this broader linkage is intended for TestingHost in all configurations.

Severity: medium

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 27.39%. Comparing base (de7cbe7) to head (fe4d8d4).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #813       +/-   ##
===========================================
+ Coverage   13.98%   27.39%   +13.40%     
===========================================
  Files         624      659       +35     
  Lines       37822    42366     +4544     
===========================================
+ Hits         5290    11605     +6315     
+ Misses      32532    30761     -1771     

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