Fix: Remove redundant conditional expression in file selection logic

[jayamrutiya]

Summary

Removed a redundant conditional operator in the upload logic that caused
a SonarQube TypeScript:S3923 issue.

Changes

• Simplified file selection:
  const file = multiple ? acceptedFiles[0] : acceptedFiles[0];
  → const file = acceptedFiles[0];

Motivation

• Improve readability and maintain clean, maintainable code.
• Ensure compliance with SonarQube rule TypeScript:S3923.

Impact

• No functional change.
• Code quality improvement only.

[vercel]

@jayamrutiya is attempting to deploy a commit to the Arc53 Team on Vercel.

A member of the Team first needs to authorize it.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 39.43%. Comparing base (498e2b7) to head (0ab4091).
⚠️ Report is 85 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2060      +/-   ##
==========================================
+ Coverage   34.67%   39.43%   +4.76%     
==========================================
  Files         131      135       +4     
  Lines        8703     9237     +534     
==========================================
+ Hits         3018     3643     +625     
+ Misses       5685     5594      -91     

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[ManishMadan2882]

good catch!