feat(dashboard): add assistant activation checklist and guided controls

src/gateway/ui/style.css

@@ -1594,6 +1594,46 @@ tr:hover td {
   margin: 10px 0;
 }
 
+.assistant-setup {
+  margin-top: 12px;
+  padding: 12px;
+  border: 1px solid var(--border);
+  border-radius: var(--radius);
+  background-color: var(--bg-secondary);
+}
+
+.assistant-checklist {
+  list-style: none;
+  margin: 10px 0;
+  padding: 0;
+  display: grid;
+  gap: 6px;
+}
+
+.assistant-checklist li {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  color: var(--text-secondary);
+  font-size: var(--font-size-sm);
+}
+
+.assistant-checklist li.done {
+  color: var(--text-primary);
+}
+
+.assistant-check {
+  width: 18px;
+  text-align: center;
+  font-weight: 700;
+}
+
+.assistant-setup-grid {
+  display: grid;
+  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
+  gap: 8px;
+}
+
 .assistant-preview-header {
   display: flex;
   justify-content: space-between;