feat(FilePicker): Improve pick and navigation logic to match user expectation

[artonge]

• Set cursor as pointer on file rows
• Expose new canPick option
• Prevent navigation to non-readable nodes

Before	After

• Needed by fix(FilesPicker): Prevent selection of nodes without create permission nextcloud/server#55796

[codecov]

Codecov Report

❌ Patch coverage is 0% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 49.32%. Comparing base (b040333) to head (c6dd72c).
⚠️ Report is 33 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/filepicker-builder.ts	0.00%	10 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2033      +/-   ##
==========================================
- Coverage   49.93%   49.32%   -0.62%     
==========================================
  Files          22       22              
  Lines         803      813      +10     
  Branches      102      102              
==========================================
  Hits          401      401              
- Misses        401      411      +10     
  Partials        1        1              

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[susnux]

I would just insist on the CSS one, the other comment is just an idea.
Meaning otherwise its really nice!

[artonge]

/backport to stable6