Store url as a stored property instead of computed property

[nearfri]

Summary

• Change the generated url from a computed property to a stored property, computed once in init.

Why

On versions below iOS 26, URL.path(percentEncoded:) misbehaves, so standardizedFileURL is used to get a correct path. Because standardizedFileURL is relatively expensive, computing it on every url access (as a computed property) is wasteful — so it is now computed once in init and stored.

let url = URL(filePath: "Library", relativeTo: URL(fileURLWithPath: "/System"))
print(url.path(percentEncoded: false)) // iOS18: Library, iOS26: /System/Library
print(url.standardizedFileURL.path(percentEncoded: false)) // All: /System/Library

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.80%. Comparing base (c81a23f) to head (db336f4).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #49      +/-   ##
==========================================
+ Coverage   96.79%   96.80%   +0.01%     
==========================================
  Files         125      125              
  Lines        5612     5635      +23     
==========================================
+ Hits         5432     5455      +23     
  Misses        180      180              

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