fix: preserve shortest float output with non_trailing_zero

[HerrCai0907]

Summary

• limit the f32 integer fast path under non_trailing_zero to the safe prefix where it matches shortest-float JSON output
• fall back to zmij::format_finite and trim only a .0 suffix for larger integral floats
• apply the same safe-prefix handling to f64 to avoid incorrect large integer fast-path output
• add regression coverage for large f32, scientific notation, and f64 boundary cases

Test

• cargo test test_serialize_float_non_trailing_zero
• cargo test --features non_trailing_zero test_serialize_float_non_trailing_zero
• cargo fmt --check

Note: cargo fmt --check prints existing nightly-only rustfmt configuration warnings, but exits successfully.

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

❌ Patch coverage is 95.12195% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.23%. Comparing base (03545a9) to head (4b3e644).

Files with missing lines	Patch %	Lines
src/format.rs	93.75%	1 Missing ⚠️
src/lazyvalue/value.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #243      +/-   ##
==========================================
+ Coverage   71.16%   71.23%   +0.07%     
==========================================
  Files          42       42              
  Lines        9762     9786      +24     
==========================================
+ Hits         6947     6971      +24     
  Misses       2815     2815              

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[liuq19]

LGTM

[liuq19]

LGTM