fix(uploader): properly handle chunked uploads

[susnux]

After some tests in apps discovered that chunking was not properly working:

• join of absolute URL vs absolute path
• double added queue jobs
• chunk slices

🤖 AI (if applicable)

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[codecov]

Codecov Report

❌ Patch coverage is 86.66667% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.93%. Comparing base (3eb88af) to head (21f8a17).

Files with missing lines	Patch %	Lines
lib/upload/utils/upload.ts	75.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1686      +/-   ##
==========================================
+ Coverage   85.15%   85.93%   +0.77%     
==========================================
  Files          44       44              
  Lines        1098     1102       +4     
  Branches      274      275       +1     
==========================================
+ Hits          935      947      +12     
+ Misses        127      117      -10     
- Partials       36       38       +2     

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