#615 Add component tests for ShipmentFilters

[Demilade10]

Summary

• add component tests for ShipmentFilters
• cover initial state, status filtering, date filtering, and clearing filters
• add accessible labels for filter inputs
• add Shipments integration coverage for filtering and clearing filters

Testing

• pnpm --dir frontend test -- ShipmentFilters.test.tsx
• pnpm --dir frontend test -- Shipments.test.tsx

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