Refactor: Improve validation schemas

src/components/auth/MFAChallenge.tsx

@@ -89,6 +89,7 @@ export function MFAChallenge({ factorId, onSuccess, onCancel }: MFAChallengeProp
             value={code}
             onChange={setCode}
             onComplete={handleVerify}
+            onPaste={(e) => e.preventDefault()}
           >
             <InputOTPGroup>
               <InputOTPSlot index={0} />

src/components/auth/TOTPSetup.tsx

@@ -220,6 +220,7 @@ export function TOTPSetup() {
                 id="verificationCode"
                 value={verificationCode}
                 onChange={(e) => setVerificationCode(e.target.value)}
+                onPaste={(e) => e.preventDefault()}
                 placeholder="000000"
                 maxLength={6}
                 className="text-center text-lg tracking-widest font-mono"