Restore exact old mobile button styling (162px)

Match the original button dimensions from when
Consulting/Console buttons were present.

Author: claude

src/css/custom.css

@@ -914,16 +914,8 @@ html[data-theme="dark"] .sign-in-button {
 
   .start-free-button, .sign-in-button {
     display: flex;
-    width: 200px;
+    width: 162px;
     justify-content: center;
-    white-space: nowrap;
-    padding: 0.5rem 1.5rem;
-  }
-
-  /* Ensure buttons fill available width in mobile sidebar */
-  .navbar-sidebar__item .start-free-button,
-  .navbar-sidebar__item .sign-in-button {
-    width: 200px;
   }
 }
 /* Start - Card styling for resources and careers page */