fix: added fix for prefix units not rendering in value panel

[ahrefabhi]

📄 Summary

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✅ Changes

• Added fix for value panel to render units that act as prefix instead of suffix.

ISSUE: #9362

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Note

Enhances ValueGraph to parse/render prefix and suffix units (including scientific notation), adds comprehensive tests and testids, and switches decimalPrecision fallback to nullish coalescing.

• Frontend
  • ValueGraph (frontend/src/components/ValueGraph/index.tsx):
    • Parse value into prefixUnit, numericValue, and suffixUnit (supports K/M/B and scientific notation) via useMemo.
    • Render prefix and suffix units with threshold-aware styling and test ids (value-graph-prefix-unit, value-graph-text, value-graph-suffix-unit).
  • NewWidget (frontend/src/container/NewWidget/index.tsx):
    • Use ?? for decimalPrecision default to preserve explicit falsy values.
• Tests
  • Add ValueGraph tests covering prefix/suffix units, K/M/B, decimals, scientific notation, and threshold styling/conflicts.
  • Update snapshot to include new test ids and unit rendering.

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