[Frontend] frontend/src/components/Stats.tsx has no test asserting it renders a graceful fallback when the backend stats endpoint returns no data

[grantfox-oss]

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Why this matters

Separately, Stats.tsx is flagged for shipping hardcoded fake TVL/stream-count numbers. Once that's fixed to pull real data, there needs to be test coverage for the case where the stats endpoint returns zero, null, or a network error, so the component doesn't render NaN, undefined, or a broken layout to visitors on the marketing homepage.

Acceptance criteria

• Add tests for zero-value, null, and error-response scenarios once real data wiring lands
• Assert a sensible fallback (e.g. "--" or a loading skeleton) rather than NaN/undefined text

Files to touch

• frontend/src/components/Stats.tsx

Out of scope

• Replacing the hardcoded numbers with real data (tracked separately)
• Redesigning the stats section layout

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[supreme2580]

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[nonso7]

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