fix: clamp convert_size_bytes_to_string at largest unit (#184)

[patchwright]

Describe your changes

Fixes #184. convert_size_bytes_to_string() raises IndexError for any size of 1024 YB or more (2**90 bytes and up). Confirmed on main HEAD c98dbf6.

Root cause: the unit-selection loop guard is factor <= factor_limit. When factor reaches the last index (YB) and the value is still >= 1024, the loop runs once more and increments factor past the end of SIZE_UNITS, so units[factor] is out of range.

Fix: change the guard to factor < factor_limit so the loop stops at the largest unit and the size saturates in YB. One line changed. Sizes below 2**90 are unaffected (byte-identical output).

Related issue

#184

How to test

Before this PR:

>>> convert_size_bytes_to_string(2**90)
IndexError: list index out of range

After this PR:

>>> convert_size_bytes_to_string(2**90)
'1024.00 YB'

Added a parametrized regression test (280, 290, 2**100). Full converter suite: 32 passed.

Backward compatibility

No breaking changes. Only inputs that previously raised IndexError change behavior.

Checklist before requesting a review

• I have performed a self-review of my code.
• I have added tests for the proposed changes.
• I have run the tests and there are not errors.

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Assisted-by: Claude (code generation, reviewed and tested locally)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.33%. Comparing base (c98dbf6) to head (4cc8abe).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #185   +/-   ##
=======================================
  Coverage   98.33%   98.33%           
=======================================
  Files          13       13           
  Lines         780      780           
=======================================
  Hits          767      767           
  Misses         13       13           

Flag	Coverage Δ
unittests	98.33% <100.00%> (ø)

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