Fully handle permissions in Item capabilities

[claucambra]

No description provided.

[Copilot]

Pull Request Overview

This PR aims to fully handle permissions for Item capabilities by revising the logic to compute the capabilities based on metadata permissions and other flags.

• Updates capability determination by checking permission characters and metadata properties
• Replaces the earlier guard for locked metadata with inline checks and adjusts the handling for directories and files

[codecov]

Codecov Report

Attention: Patch coverage is 99.77629% with 1 line in your changes missing coverage. Please review.

Project coverage is 83.61%. Comparing base (36ba86a) to head (9d24b70).
Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
Sources/NextcloudFileProviderKit/Item/Item.swift	96.15%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #86      +/-   ##
==========================================
+ Coverage   83.00%   83.61%   +0.60%     
==========================================
  Files          70       70              
  Lines       14924    15337     +413     
==========================================
+ Hits        12388    12824     +436     
+ Misses       2536     2513      -23     

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