feat(forms): enhance form validation and accessibility (#514)

[temisan0x]

Closes #514

Summary

The auth forms had incomplete validation feedback and accessibility gaps. This PR fixes both without touching any business logic or refactoring the form structure.

What changed

login/page.tsx

• Email and password inputs now show a red border when their field has an error
• Added aria-invalid and aria-describedby on both inputs so screen readers correctly associate error messages with their fields

signup/page.tsx

• Same aria-invalid, aria-describedby, and error border improvements across name, email, and password fields
• Added the missing confirmPassword field — it existed in the schema and validation but was never rendered in the form

What was not changed

• No schema changes
• No component refactoring
• No business logic touched
• All existing styles and structure preserved

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