Inform system of items' shared status

[claucambra]

No description provided.

[Copilot]

Pull Request Overview

This PR adds computed properties to inform the system whether an item is shared and if it is shared by the current user, as well as to expose the owner's name components when applicable.

• Adds computed property isShared to determine if an item is shared
• Adds computed property isSharedByCurrentUser to determine if the current user is the owner
• Adds computed property ownerNameComponents to retrieve owner name data for shared items

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.67%. Comparing base (41c1a7f) to head (eedde0c).
Report is 64 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #69      +/-   ##
==========================================
+ Coverage   81.60%   81.67%   +0.07%     
==========================================
  Files          62       62              
  Lines       12882    12942      +60     
==========================================
+ Hits        10512    10571      +59     
- Misses       2370     2371       +1     

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