trade size under update

[rouzwelt]

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Summary by CodeRabbit

• New Features

  • Router trade sizing now searches for the most profitable input amount instead of always prioritizing the full trade size.
  • Full-size trades remain available when they provide the best result.
  • Improved support for routes with low-decimal tokens and price-impact limits.

• Bug Fixes

  • Improved retry handling when a trade exceeds available output balance.
  • Dry-run retries now recalculate the best trade size while excluding previously failed routes.

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