feat(editor): Retrieve previous chat message on arrow-up (#8696)

Signed-off-by: Oleg Ivaniv <me@olegivaniv.com>

packages/editor-ui/src/stores/workflows.store.ts

@@ -125,6 +125,7 @@ export const useWorkflowsStore = defineStore(STORES.WORKFLOWS, {
 		executionWaitingForWebhook: false,
 		nodeMetadata: {},
 		isInDebugMode: false,
+		chatMessages: [],
 	}),
 	getters: {
 		// Workflow getters
@@ -277,6 +278,9 @@ export const useWorkflowsStore = defineStore(STORES.WORKFLOWS, {
 		getTotalFinishedExecutionsCount(): number {
 			return this.finishedExecutionsCount;
 		},
+		getPastChatMessages(): string[] {
+			return Array.from(new Set(this.chatMessages));
+		},
 	},
 	actions: {
 		getPinDataSize(pinData: Record<string, string | INodeExecutionData[]> = {}): number {
@@ -1436,5 +1440,13 @@ export const useWorkflowsStore = defineStore(STORES.WORKFLOWS, {
 				},
 			};
 		},
+
+		resetChatMessages(): void {
+			this.chatMessages = [];
+		},
+
+		appendChatMessage(message: string): void {
+			this.chatMessages.push(message);
+		},
 	},
 });