feat(admin): add toggle switch CSS for test publish settings

Author: lb1192176991-lab

admin/src/styles.css

@@ -2022,3 +2022,41 @@ body {
     padding: 16px;
   }
 }
+
+/* Test mode toggle switch */
+.test-mode-toggle {
+  margin-bottom: 1rem;
+}
+.toggle-label {
+  display: flex;
+  align-items: center;
+  gap: 0.75rem;
+  cursor: pointer;
+}
+.toggle-switch {
+  position: relative;
+  width: 44px;
+  height: 24px;
+  background: #374151;
+  border-radius: 12px;
+  transition: background 0.2s;
+  display: inline-block;
+}
+.toggle-switch.on { background: #22c55e; }
+.toggle-switch.off { background: #6b7280; }
+.toggle-knob {
+  position: absolute;
+  top: 2px;
+  left: 2px;
+  width: 20px;
+  height: 20px;
+  background: white;
+  border-radius: 50%;
+  transition: transform 0.2s;
+}
+.toggle-switch.on .toggle-knob { transform: translateX(20px); }
+.toggle-hint {
+  margin-top: 0.25rem;
+  font-size: 0.75rem;
+  color: #9ca3af;
+}