feat(mcp): add preset setup and capability mentions

webui/src/lib/mcp-preset-events.ts

@@ -0,0 +1,20 @@
+import type { McpPresetInfo, McpPresetsPayload } from "@/lib/types";
+
+export const MCP_PRESETS_CHANGED_EVENT = "nanobot:mcp-presets-changed";
+
+export function isMcpPresetsPayload(value: unknown): value is McpPresetsPayload {
+  return !!value
+    && typeof value === "object"
+    && Array.isArray((value as { presets?: unknown }).presets);
+}
+
+export function installedMcpPresetsFromPayload(payload: McpPresetsPayload): McpPresetInfo[] {
+  return payload.presets.filter((preset) => preset.installed && preset.configured);
+}
+
+export function notifyMcpPresetsChanged(payload: McpPresetsPayload): void {
+  if (typeof window === "undefined") return;
+  window.dispatchEvent(new CustomEvent<McpPresetsPayload>(MCP_PRESETS_CHANGED_EVENT, {
+    detail: payload,
+  }));
+}