🔒 [security fix for third party cookies in WebView]

🎯 **What:** Disabled third-party cookies in WebViewLoginScreen.kt.
⚠️ **Risk:** Allowing third-party cookies increases the risk of cross-site tracking and potential CSRF attacks if third-party content is loaded in the WebView.
🛡️ **Solution:** Changed `setAcceptThirdPartyCookies` to `false` to restrict cookies strictly to the first-party domain.

Co-authored-by: alvin000009238 <107313913+alvin000009238@users.noreply.github.com>

Author: google-labs-jules[bot]

android/app/src/main/java/com/clhs/score/ui/WebViewLoginScreen.kt

@@ -219,7 +219,7 @@ private fun WebViewContent(
 
                 val cookieManager = CookieManager.getInstance()
                 cookieManager.setAcceptCookie(true)
-                cookieManager.setAcceptThirdPartyCookies(this, true)
+                cookieManager.setAcceptThirdPartyCookies(this, false)
 
                 val jsInterface = LoginJsInterface { studentNo ->
                     if (loginHandled || !isTrustedLoginPage) return@LoginJsInterface