[Bug]: Newsletter Form Missing Email Validation & Storage

[suman20041]

Description

The newsletter form on the home page submits successfully but lacks proper email validation and doesn't store subscriber data, making it ineffective for collecting genuine leads.

Steps to Reproduce

• Navigate to the home page
• Scroll to the newsletter section at the bottom
• Enter an invalid email (e.g., "test" or "test@domain")
• Click Subscribe button
• Form submits without proper validation
• Success message appears regardless of email validity

Expected Behavior

• Form should validate email format using regex
• Show specific error message for invalid emails
• Store valid emails in localStorage
• Prevent duplicate subscriptions
• Display appropriate success/error messages

Actual Behavior

• Form accepts invalid email formats (e.g., "test", "test@", "@domain.com")
• No validation beyond HTML5 type="email" attribute
• Only shows a generic success message without storing subscriber information
• No duplicate email detection

[github-actions]

Thanks @suman20041! 👋
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[suman20041]

@sayeeg-11 please assign this issue under ECWoC26