feat(ui): implement client-side email format validation on signup (#3874)

[singhanurag0317-bit]

Add regex-based email validation with real-time feedback on Signup.jsx and AdminSignup.jsx. Closes #3874

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Reviewing files that changed from the base of the PR and between da8faf2 and c26f8bb.

📒 Files selected for processing (2)

• Frontend/src/pages/AdminSignup.jsx
• Frontend/src/pages/Signup.jsx

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