[WIP] Implement Email Format Validation

[Merango]

Implement Email Format Validation

Description

Task

Implement Email Format Validation

Acceptance Criteria

• Implement RFC 5322 standard email format validation regex
  Ensure email validation prevents registration with invalid email formats
  Add database-level unique constraint on email field
  Create unit tests covering at least 10 different email format scenarios (valid and invalid)
  Implement case-insensitive email uniqueness check

Summary of Work

This pull request introduces email format validation to enhance form input validation and improve user experience. The primary objective is to ensure that email addresses entered by users follow a standard, valid format before submission.

Changes Made

• Add email validation utility function
• Implement regex-based email format check
• Create validation logic for email input fields

Tests

• Verify email validation handles valid email formats
• Check rejection of invalid email formats
• Test edge cases for email validation

Signatures

Staking Key

Gkn3eRUR8rbiHgjXYmXWKgBQnGQWEhJk1n9rvecfFxTm: 23Xo3CJZBGTog9GWCUzKY6UCk1cNsSzpuuEvvtwYxcWF6BTx95HQv7B2HCEGQQ6nShkz4yHTsfAAA5DhC78ANngBy5bMPkAL1cHo5eHiNS4ShJFa9yg3mSgXAzSTXJVeRuW1hUit9hzsgZHqV7NUng9eq65cmFut3MmDKK9h1GiHS9nAF2Rh4XtM2smpGWB2Ur5k9bTwgVCk1oi5YG3E2DeDAjhA7WfnQ7pZRGbL8bbVyxnzHrkwdgBv4xGpYbVPCXVQVnHJ2jrNxL45DAkYtZ9VJmKbvjeRLdBE2wyv8MTnssAmXNHbKHSp5rE1AwYhsWUBTm3gTr5hXKi4ZArc5LL1S2ztgR99MRbaiwbgRHdLvyC96SNza27KiKju2YvVrQFUUf49hKANyhWtXzgFQgT9KF4ruLFN

Public Key

Gq6qy4e4ja8P8iQiawFZvBSYYd62G4X2swAb5rr2axvw: cR9AqHpEah3GUAFx7YZFybTRGvsdYMz66kuQwJPqZ1huj6yAWfZZ6hmewv4aMgopB6F7zmGUcXt7vL1gdPcftgWvkTab4kFtWEBhs5VcqML1kg15wyckkiAcwsH4xzcMZbZr5JNQ6VrNnUT9o4i9KQ8UsrCScJMW9FAmZMGFJRHLNkRzvBbXrGSjJLVsBqBiMsURMWavmwcXhxa5LGSpemGsGAivVWVVSHQVMo6iswX3ve8nY7LMoE7nX4PFSnFpATryXRmxoR25PpHiAhVTdr5KmxTLMAxDJHubmAZqFUviWRdBUUxR8ktPyj57z3r7LHTaS8xRcq1TaMUY3HiPBR1jNdaDGJVPDVtZGcWSQQxpi6KiLgRRUS2PHrq1zDPMpePYqcCaChfQPSytxWjpg6dfJ9fhqNU