accessibility: add visible high-contrast focus rings to all form inputs in ProfileModal

[SourabhX16]

Problem Statement

Input fields in ProfileModal use low-contrast focus outlines that blend into background overlay.

Why It Matters

Keyboard navigators cannot clearly identify active text input field.

Expected Behaviour

Apply high-contrast focus ring styles (focus-visible:ring-2 focus-visible:ring-cyan-400).

Acceptance Criteria

• All inputs in ProfileModal display high-contrast focus ring when active.
• Tailwind focus-visible classes applied.
• Accessibility compliant.

Likely Affected Files / Components

• src/components/ProfileModal.tsx