Rebrand to 比特骆驼自动化对冲系统; clear login autofill and sim subtitle.

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/src/styles/app.css

@@ -144,7 +144,7 @@ input {
 
 @media (max-width: 900px) {
   .topnav-side.left .brand {
-    max-width: 9em;
+    max-width: 11em;
   }
 }
 
@@ -400,7 +400,8 @@ input {
 
 .login-box h1 {
   margin: 0;
-  font-size: 22px;
+  font-size: 20px;
+  line-height: 1.35;
 }
 
 .login-title-row {
@@ -408,7 +409,7 @@ input {
   align-items: flex-start;
   justify-content: space-between;
   gap: 10px;
-  margin-bottom: 6px;
+  margin-bottom: 20px;
 }
 
 .login-box p {
@@ -417,6 +418,10 @@ input {
   font-size: 13px;
 }
 
+.login-box .err {
+  margin-bottom: 14px;
+}
+
 .field {
   display: grid;
   gap: 6px;