test(utils): add unit tests for portfolio allocation utilities (#1974)

[s6pa1rta3n-lab]

Summary

• Adds src/utils/portfolioAllocation.ts exporting pure functions aggregateByRiskProfile, aggregateByAsset, and formatAllocationValue.
• Adds unit test suite in src/utils/tests/portfolioAllocation.test.ts covering grouping/summing behavior, unknown risk profile fallback color (#666), palette cycling past length, and non-numeric amount handling.

Changes

• src/utils/portfolioAllocation.ts: Implements pure allocation aggregation functions with TypeScript contracts and JSDoc documentation.
• src/utils/tests/portfolioAllocation.test.ts: Vitest test suite asserting:
  • aggregateByRiskProfile: Groups commitments by risk profile, sums parsed amounts, assigns configured risk colors, defaults undefined types to Unknown with fallback color #666, assigns fallback color #666 for unrecognized profile names, treats non-numeric amounts as zero, and handles empty input.
  • aggregateByAsset: Groups commitments by asset, sums amounts, defaults missing asset names to Unknown, treats non-numeric amounts as zero, cycles asset palette colors past length 10, and handles empty input.
  • formatAllocationValue: Formats numbers with locale separators up to two decimal places, handles integers, and rounds decimal values.

Verification

• pnpm exec vitest run src/utils/tests/portfolioAllocation.test.ts passes (13/13 tests).
• pnpm exec vitest --coverage run src/utils/tests/portfolioAllocation.test.ts reports 100% statement, branch, function, and line coverage on src/utils/portfolioAllocation.ts.
• pnpm exec prettier --check src/utils/portfolioAllocation.ts src/utils/tests/portfolioAllocation.test.ts passes.
• pnpm exec eslint src/utils/portfolioAllocation.ts src/utils/tests/portfolioAllocation.test.ts passes with zero errors.

Closes #1974

Payout Routing

• EVM (Base/Arbitrum/Polygon/ETH): 0xF46C9F6d70C50BF81ef3588AB523a90a594a2F89
• Stellar: GCL6OXAMLD75BMTINA6EMRUDWK5THQUSHMYNLSNBCJAPZJHNYJTUNIBC

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