✨ Improve Signup Form: Show specific password validation errors

[SrinjoyeeDey]

🚀 Summary:

This PR Fixes #61 the password validation in the Signup page by:

✅ Displaying specific password validation errors (length, uppercase, lowercase) only when the user clicks SIGN-UP.

❌ Preventing signup if any validation fails.

📝 Showing field errors (name, email, avatar) alongside password errors for better UX.

🛠 Changes Made:

Password Validation Refactor

Each failing password rule now generates a specific error message.

Example: Password must contain at least one uppercase letter.

Validation Trigger

Errors are shown only on SIGN-UP click, keeping UI clean.

Prevents form submission until all rules are satisfied.

Error Display

Field and password errors are displayed individually in red, improving clarity.

Removed old checklist with green/red ticks.

Code Clean-Up

Simplified error state handling with errors object.

Removed unnecessary showErrors state for cleaner logic.

🎨 UI/UX Improvements:

Users now see exactly which password rule failed.

Errors appear after clicking SIGN-UP, avoiding confusion.

Form submission is blocked until all validations pass.

📸 Screenshots / GIFs:

⚡ How to Test:

Navigate to /signup.

Try submitting an empty form → field errors should appear.

Enter password failing each rule → see specific password error messages.

Fill all fields correctly → signup should succeed and redirect to /landing.

Try Google signup → avatar selection required; error appears if missing.