fix: handle decimal string input in intword()

[jtvhd6]

Bug: intword("12400.9") returns "12400.9" instead of "12.4 thousand" because int("12400.9") raises a ValueError in Python.
Fix: Changed value = int(value) to value = int(float(value)) so decimal strings are handled correctly, consistent with how intcomma() already handles this case.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.55%. Comparing base (c2c410c) to head (4f0797a).

Additional details and impacted files

@@ Coverage Diff @@## main #332 +/- ##
=======================================
Coverage 99.55% 99.55% =======================================
Files 12 12 Lines 900 900 =======================================
Hits 896 896 Misses 4 4 

Flag	Coverage Δ
macos-latest	97.55% <100.00%> (ø)
ubuntu-latest	97.55% <100.00%> (ø)
windows-latest	95.66% <100.00%> (ø)

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[codspeed-hq]

Merging this PR will not alter performance

✅ 15 untouched benchmarks

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_{Comparing jtvhd6:main (4f0797a) with main (c2c410c)}

[hugovk]

Thanks for the PR, please could you add test cases that failed before and pass with this fix?

For example, ("1234.5", "1.2 thousand") and ("1234.9", "1.2 thousand") to test_intword.