Convert a Hexadecimal Address to Dotted IPv4

Convert a 32-bit hexadecimal address to dotted-decimal IPv4 notation. Implement `hex_to_ipv4(text: string) -> string`. ### Constraints & Assumptions The source reports a hex-to-IPv4 conversion without exact formatting rules. This practice contract uses network-order bytes: the leftmost byte is the first decimal octet. - Input length is at most 100. Accept exactly eight hexadecimal digits, optionally preceded by `0x` or `0X`. - Hexadecimal digits are case-insensitive. Whitespace, signs, separators, and any other length or character are invalid. - On valid input return four decimal octets separated by dots, without leading zeroes. On invalid input return `INVALID`. - Treat the value as an unsigned 32-bit bit pattern; addresses whose high bit is set are valid. ### Examples ```text hex_to_ipv4("C0A80101") -> "192.168.1.1" hex_to_ipv4("0xffffffff") -> "255.255.255.255" hex_to_ipv4("00000000") -> "0.0.0.0" hex_to_ipv4("1FF") -> "INVALID" ``` Explain how your byte-order choice and signed-integer handling affect the result. A solution that parses four two-character byte values can avoid signed 32-bit overflow entirely.