fix(sdk): tighten percentageString validator and guard BigInt pct parsing

[devtechedge]

Fixes #266

Summary of Changes

• Validator schema tightening: Updated percentageString regex in packages/sdk/src/api/validators.ts from /^\d+(\.\d+)?$/ to /^\d+$/ so percentage strings with decimal points are caught and rejected at the validation boundary rather than crashing downstream consumers.
• Defensive BigInt conversion: In packages/sdk/src/actions/getSuggestedFees.ts, wrapped pct assignments in parseSuggestedFees with safe parsing (toBigIntPct) so unexpected float strings will not throw an uncaught SyntaxError: Cannot convert ... to a BigInt at runtime.
• Changeset: Added @across-protocol/app-sdk patch changeset via .changeset/fix-suggested-fees-pct-bigint.md.
• Unit Tests: Added test cases in test/unit/api/suggested-fees.test.ts verifying decimal rejection by percentageString and safe conversion in parseSuggestedFees.

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The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@across-protocol/app-sdk	Patch

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[devtechedge]

Hi - light nudge on this suggested-fees parsing harden whenever review time opens up.

percentageString accepted values like 12.5, which later blew up as SyntaxError: Cannot convert ... to a BigInt in parseSuggestedFees (Fixes #266).

The PR tightens the validator regex to /^\d+$/, wraps pct assignments with a safe toBigIntPct helper, and adds unit coverage for decimal rejection plus safe conversion, with a patch changeset for @across-protocol/app-sdk.

Diff is localized to validators.ts, getSuggestedFees.ts, and the suggested-fees tests.

Happy to rebase, expand fixtures, or adjust the error messaging if that helps - no pressure on timing.