fix: OTP auto-submit not firing when typing manually

String.includes("") always returns true in JavaScript, so the condition
`!newValue.includes("")` was always false, preventing onComplete from
ever firing on manual input. Only paste worked because it uses a
separate code path. The length check alone is sufficient since empty
digits produce a shorter joined string.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/portal/src/components/molecules/OtpInput/OtpInput.tsx

@@ -65,7 +65,7 @@ function useOtpHandlers({
       const newValue = newDigits.join("");
       onChange(newValue);
       if (char && index < length - 1) focusInput(index + 1);
-      if (newValue.length === length && !newValue.includes("")) onComplete?.(newValue);
+      if (newValue.length === length) onComplete?.(newValue);
     },
     [digits, length, onChange, onComplete, focusInput]
   );