fix(frontend): add Full Name and Work Email validation in ContactSales Get Started form

[Aryanbansal-05]

🎯 Summary

Resolves #4031 by adding client-side validation to the Full Name and Work Email fields in the ContactSales form, preventing invalid values like a12d! or abc@a from being submitted.

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🛠️ Changes Made

Frontend/src/pages/ContactSales.tsx

Added errors state to track field-level validation errors.

Added validateForm() function:

• Full Name: validated against /^[a-zA-Z\s'\-]{2,100}$/ — only letters, spaces, hyphens, apostrophes allowed
• Work Email: validated against /^[^\s@]+@[^\s@]+\.[^\s@]{2,}$/ — requires valid domain with TLD (e.g. john@company.com, rejects abc@a)

Updated handleSubmit():

• Calls validateForm() before submission — blocks submit if validation fails

Updated handleChange():

• Clears field error on user input for better UX

Added inline error messages:

• Red border on invalid fields
• Error text displayed below Full Name and Work Email inputs

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✅ Fixes

• a12d! rejected in Full Name field with clear error message
• abc@a rejected in Work Email field — requires valid TLD
• Numbers and special characters blocked in Full Name
• Form no longer proceeds to submission with invalid values
• Error clears automatically when user corrects the input

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Closes #4031

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[Aryanbansal-05]

Hi @riteshbonthalakoti! The issue has been resolved and the PR is ready to get merged. Thankyou!