fix: handle undefined fUSDC in SwapPro component

[devin-ai-integration]

Fix undefined fUSDC in SwapPro component

Changes

• Added null check for fUSDC in formattedTokenPrice calculation
• Added early return with "0" when fUSDC is undefined
• Updated useMemo dependency array to properly include fUSDC

Testing

• Changes have been tested through:
  • Format checks (pnpm format:check)
  • Lint checks (pnpm lint:next)
  • Test linting (pnpm lint:tests)

Link to Devin run

https://app.devin.ai/sessions/ed26924500044f5eaf5960947774aa5f

[devin-ai-integration]

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[codecov]

Codecov Report

Attention: Patch coverage is 25.00000% with 3 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
web/src/components/SwapPro/index.tsx	25.00%	2 Missing and 1 partial ⚠️

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