Change: use byterate for beszel network field

[shamoon]

Proposed change

Closes #6401

Type of change

• New service widget
• Bug fix (non-breaking change which fixes an issue)
• New feature or enhancement (non-breaking change which adds functionality)
• Documentation only
• Other (please explain)

Checklist:

• If applicable, I have added corresponding documentation changes.
• If applicable, I have added or updated tests for new features and bug fixes (see testing).
• If applicable, I have reviewed the feature / enhancement and / or service widget guidelines.
• I have checked that all code style checks pass using pre-commit hooks and linting checks.
• If applicable, I have tested my code for new features & regressions on both mobile & desktop devices, using the latest version of major browsers.
• In the description above I have disclosed the use of AI tools in the coding of this PR.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.39%. Comparing base (b676424) to head (118a5de).
⚠️ Report is 1 commits behind head on dev.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #6402   +/-   ##
=======================================
  Coverage   88.39%   88.39%           
=======================================
  Files         520      520           
  Lines       24621    24624    +3     
  Branches     2162     2163    +1     
=======================================
+ Hits        21763    21767    +4     
+ Misses       2749     2748    -1     
  Partials      109      109           

Flag	Coverage Δ
shard-1	33.19% <0.00%> (-0.01%)	⬇️
shard-2	30.73% <0.00%> (-0.01%)	⬇️
shard-3	38.58% <0.00%> (-0.01%)	⬇️
shard-4	31.44% <100.00%> (+0.01%)	⬆️
vitest	88.36% <100.00%> (+<0.01%)	⬆️

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Files with missing lines	Coverage Δ
src/widgets/beszel/component.jsx	91.37% <100.00%> (+2.28%)	⬆️

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