fix float chunking issue in write

[rhaegar325]

Fix TypeError in chunked write: Convert time_chunk to integer

Problem

When using chunked writing for large datasets, the write() method crashes with:

TypeError: 'float' object cannot be interpreted as an integer

This occurs because calculate_chunk_size_for_variable() returns float values for chunk sizes, but Python's range() function requires integer arguments.

Root Cause

In the chunked write loop (line 813), time_chunk is used directly in range():

for t_start in range(0, total_timesteps, time_chunk):  # time_chunk is float

Solution

Convert time_chunk to integer before using it in range():

time_chunk = int(chunk_sizes.get("time", self.ds.sizes["time"]))

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 60.91%. Comparing base (0eb8d0e) to head (2f948e3).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #170      +/-   ##
==========================================
+ Coverage   52.02%   60.91%   +8.89%     
==========================================
  Files          18       18              
  Lines        2722     2848     +126     
==========================================
+ Hits         1416     1735     +319     
+ Misses       1306     1113     -193     

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