feat(ui): add reusable Label component

[peternnadi1999]

Summary

Introduces a reusable Label component for form fields using Radix UI, reducing duplicated markup and improving form accessibility. Refactors part of RegisterClient to compose Label with Input instead of using inline wrappers.

Changes

• Added src/components/ui/label.tsx
• Built the component using @radix-ui/react-label
• Matched the existing text-sm font-medium styling
• Ensured labels are correctly associated with inputs using htmlFor and matching id attributes
• Refactored at least one field in RegisterClient to use the new Label component with Input
• Reduced duplicated form wrapper markup and improved component consistency

Verification

• npm run typecheck
• npm run format:check

Notes

closes #85

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