feat(webchat): add personal assistant mode controls in settings

src/gateway/ui/style.css

@@ -1366,6 +1366,52 @@ tr:hover td {
   border-color: var(--accent);
 }
 
+.assistant-mode-grid {
+  display: grid;
+  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
+  gap: 10px;
+  margin-bottom: 12px;
+}
+
+.assistant-toggle,
+.assistant-field {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  background-color: var(--bg-secondary);
+  border: 1px solid var(--border);
+  border-radius: var(--radius);
+  padding: 10px 12px;
+  color: var(--text-secondary);
+  font-size: var(--font-size-sm);
+}
+
+.assistant-field {
+  flex-direction: column;
+  align-items: flex-start;
+}
+
+.assistant-field input[type="number"],
+.assistant-field input[type="text"] {
+  width: 100%;
+  padding: 8px;
+  background-color: var(--bg-input);
+  color: var(--text-primary);
+  border: 1px solid var(--border);
+  border-radius: var(--radius);
+  outline: none;
+}
+
+.assistant-field input:focus {
+  border-color: var(--accent);
+}
+
+.assistant-actions {
+  display: flex;
+  align-items: center;
+  gap: 12px;
+}
+
 .btn {
   padding: 8px 16px;
   font-family: var(--font-mono);