feat: Add support for dark mode node icons and colors

packages/@n8n/nodes-langchain/nodes/agents/Agent/Agent.node.ts

@@ -234,6 +234,7 @@ export class Agent implements INodeType {
 		displayName: 'AI Agent',
 		name: 'agent',
 		icon: 'fa:robot',
+		iconColor: 'black',
 		group: ['transform'],
 		version: [1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6],
 		description: 'Generates an action plan and executes it. Can use external tools.',

packages/@n8n/nodes-langchain/nodes/embeddings/EmbeddingsOpenAI/EmbeddingsOpenAi.node.ts

@@ -71,7 +71,7 @@ export class EmbeddingsOpenAi implements INodeType {
 	description: INodeTypeDescription = {
 		displayName: 'Embeddings OpenAI',
 		name: 'embeddingsOpenAi',
-		icon: 'file:openAi.svg',
+		icon: { light: 'file:openAiLight.svg', dark: 'file:openAiLight.dark.svg' },
 		credentials: [
 			{
 				name: 'openAiApi',

packages/@n8n/nodes-langchain/nodes/llms/LMChatOpenAi/LmChatOpenAi.node.ts

@@ -16,7 +16,7 @@ export class LmChatOpenAi implements INodeType {
 		displayName: 'OpenAI Chat Model',
 		// eslint-disable-next-line n8n-nodes-base/node-class-description-name-miscased
 		name: 'lmChatOpenAi',
-		icon: 'file:openAi.svg',
+		icon: { light: 'file:openAiLight.svg', dark: 'file:openAiLight.dark.svg' },
 		group: ['transform'],
 		version: 1,
 		description: 'For advanced usage with an AI chain',

packages/@n8n/nodes-langchain/nodes/llms/LMOpenAi/LmOpenAi.node.ts

@@ -28,7 +28,7 @@ export class LmOpenAi implements INodeType {
 		displayName: 'OpenAI Model',
 		// eslint-disable-next-line n8n-nodes-base/node-class-description-name-miscased
 		name: 'lmOpenAi',
-		icon: 'file:openAi.svg',
+		icon: { light: 'file:openAiLight.svg', dark: 'file:openAiLight.dark.svg' },
 		group: ['transform'],
 		version: 1,
 		description: 'For advanced usage with an AI chain',