fix(auth): restore topnav auth button styling

Signed-off-by: czyt <czytcn@gmail.com>

Commit-Message-Assisted-by: Claude (via Claude Code)

Author: czyt

web/static/css/style.css

@@ -39,6 +39,7 @@ body{font-family:-apple-system,BlinkMacSystemFont,'PingFang SC','Helvetica Neue'
 /* Change Password Modal */
 .pwd-modal{position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,.5);display:flex;align-items:center;justify-content:center;z-index:500}
 .pwd-modal.hidden{display:none}
+.auth-btn{padding:5px 12px;border-radius:6px;border:1px solid var(--bd);font-size:13px;cursor:pointer;background:var(--bg);color:var(--tx2);transition:border-color .15s,color .15s,background .15s}
 .auth-btn:hover{border-color:var(--or);color:var(--or)}
 .auth-btn.primary{background:var(--or);color:#fff;border-color:var(--or)}
 .auth-btn.primary:hover{background:var(--or2)}