Add unit tests for the utils classification helpers

[Baskarayelu]

Closes #986

Summary

Basic implementation of: Add unit tests for the utils classification helpers

Changes

• Added src/utils/__tests__/classification.test.ts with 10 focused test cases
• Covers all classification branches: low_compliance, maturing_soon, action_required
• Tests exact boundary conditions (complianceScore < 70, daysRemaining <= 7, drawdown >= 800f maxLoss)
• Pins exact returned token strings to prevent silent styling drift
• Tests edge cases: non-numeric drawdown/maxLoss, empty input, multiple risk categories, fallback/filter behavior

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