Cache save details on the controller

Keep a copy of the instance saves details on the controller so that
saves can be queried even when the host is disconnected and the
controller can properly track and provide updates on the saves to
its clients.

packages/controller/src/ControlConnection.ts

@@ -85,6 +85,7 @@ export default class ControlConnection extends BaseConnection {
 		this.handle(lib.InstanceConfigSetFieldRequest, this.handleInstanceConfigSetFieldRequest.bind(this));
 		this.handle(lib.InstanceConfigSetPropRequest, this.handleInstanceConfigSetPropRequest.bind(this));
 		this.handle(lib.InstanceAssignRequest, this.handleInstanceAssignRequest.bind(this));
+		this.handle(lib.InstanceSaveDetailsListRequest, this.handleInstanceSaveDetailsListRequest.bind(this));
 		this.handle(lib.InstanceRenameSaveRequest, controller.sendRequestToHostByInstanceId.bind(controller));
 		this.handle(lib.InstanceCopySaveRequest, controller.sendRequestToHostByInstanceId.bind(controller));
 		this.handle(lib.InstanceDeleteSaveRequest, controller.sendRequestToHostByInstanceId.bind(controller));
@@ -277,6 +278,10 @@ export default class ControlConnection extends BaseConnection {
 		await this._controller.instanceAssign(request.instanceId, request.hostId);
 	}
 
+	async handleInstanceSaveDetailsListRequest() {
+		return [...this._controller.saves.values()];
+	}
+
 	async handleInstanceDownloadSaveRequest(request: lib.InstanceDownloadSaveRequest) {
 		let { instanceId, name } = request;
 		let stream = await routes.createProxyStream(this._controller.app);