test: cover TrustBadge states and tooltip accessibility

[felixvippp-ai]

Summary

• add React Testing Library coverage for every TrustBadge trust level
• cover tooltip enabled/disabled behavior, className merging, and unknown-level fallback
• add accessible label/description wiring for the badge tooltip plus focused test notes

Closes #639.

Tests

• npm.cmd test -- --run src/components/tests/TrustBadge.test.tsx

Build note

• npm.cmd run build currently fails before this change's files are reached because the existing codebase has unrelated compilation errors, including CommitmentDetailsModal.tsx JSX parsing, commitments/[id]/settle route syntax, and duplicate backend symbol definitions.

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