feat(signup): add password strength and breach check using HIBP API

- Implemented frontend password validation for minimum strength:
  - Requires 8+ characters with uppercase, lowercase, digit, and special character.
- Integrated haveibeenpwned (HIBP) k-anonymity API to detect breached passwords.
- Display appropriate error messages for weak or pwned passwords.
- Updated Message component to support "error" and "default" types with styling.
- Cleaned up SignupPage form UI and removed unused refs (e.g., roleElement).
- Created passwordUtils.js to isolate SHA-1 hashing and API call logic.

Frontend/src/components/Message.jsx

@@ -1,12 +1,18 @@
 import React from "react";
 
-const Message = ({ message }) => {
+const Message = ({ message, type = "error" }) => {
   const date = new Date();
+
+  const background =
+    type === "error"
+      ? "bg-red-100 border border-red-400 text-red-700"
+      : "bg-gray-100 border border-gray-300 text-gray-800";
+
   return (
-    <div className="w-auto h-auto bg-gray-200 rounded-md text-start p-3 mx-4">
-      <p className="">{message}</p>
-      <p className="text-end text-sm ">
-        {date.getDate()}/{date.getMonth()}/{date.getFullYear()}{" "}
+    <div className={`rounded-md p-3 ${background}`}>
+      <p className="font-medium">{message}</p>
+      <p className="text-end text-sm text-gray-600">
+        {date.getDate()}/{date.getMonth() + 1}/{date.getFullYear()}{" "}
         {date.toLocaleTimeString()}
       </p>
     </div>