chore: fix usdc send precision

[tomiir]

Description

• Number(4.1) * 1_000_000 = 4100000 (right?)
• A former PM of mine would say: haha, computers

• Adds Math.round and parseFloat to handle USDC amount parsing

Type of change

• Chore (non-breaking change that addresses non-functional tasks, maintenance, or code quality improvements)
• [] Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

• [] Code in this PR is covered by automated tests (Unit tests, E2E tests)
• My changes generate no new warnings
• I have reviewed my own code
• I have filled out all required sections
• I have tested my changes on the preview link
• Approver of this PR confirms that the changes are tested on the preview link

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Latest commit: 50015aa

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Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	47.69%	12267 / 25720
🔵	Statements	47.69%	12267 / 25720
🔵	Functions	34.26%	832 / 2428
🔵	Branches	76.89%	1308 / 1701

File Coverage

No changed files found.

Generated in workflow #7876 for commit 50015aa by the Vitest Coverage Report Action

[zoruka]

Could we have tests here?

[enesozturk]

We are using bignumber.js in AppKit for these kind of calculations (heavily used for swaps) - maybe we could have the same utility in lab for these calculations too? Or expose that utility from AppKit if it's helpful enough?