diff --git a/tools/server/webui/src/lib/constants/attachment-labels.ts b/tools/server/webui/src/lib/constants/attachment-labels.ts
new file mode 100644
index 0000000000..2a32e4e18b
--- /dev/null
+++ b/tools/server/webui/src/lib/constants/attachment-labels.ts
@@ -0,0 +1,3 @@
+export const ATTACHMENT_LABEL_FILE = 'File';
+export const ATTACHMENT_LABEL_PDF_FILE = 'PDF File';
+export const ATTACHMENT_LABEL_MCP_PROMPT = 'MCP Prompt';
diff --git a/tools/server/webui/src/lib/constants/code-blocks.ts b/tools/server/webui/src/lib/constants/code-blocks.ts
new file mode 100644
index 0000000000..0f7265104d
--- /dev/null
+++ b/tools/server/webui/src/lib/constants/code-blocks.ts
@@ -0,0 +1,8 @@
+export const CODE_BLOCK_SCROLL_CONTAINER_CLASS = 'code-block-scroll-container';
+export const CODE_BLOCK_WRAPPER_CLASS = 'code-block-wrapper';
+export const CODE_BLOCK_HEADER_CLASS = 'code-block-header';
+export const CODE_BLOCK_ACTIONS_CLASS = 'code-block-actions';
+export const CODE_LANGUAGE_CLASS = 'code-language';
+export const COPY_CODE_BTN_CLASS = 'copy-code-btn';
+export const PREVIEW_CODE_BTN_CLASS = 'preview-code-btn';
+export const RELATIVE_CLASS = 'relative';
diff --git a/tools/server/webui/src/lib/markdown/enhance-code-blocks.ts b/tools/server/webui/src/lib/markdown/enhance-code-blocks.ts
index 02cdff3974..168de97403 100644
--- a/tools/server/webui/src/lib/markdown/enhance-code-blocks.ts
+++ b/tools/server/webui/src/lib/markdown/enhance-code-blocks.ts
@@ -13,6 +13,16 @@
 import type { Plugin } from 'unified';
 import type { Root, Element, ElementContent } from 'hast';
 import { visit } from 'unist-util-visit';
+import {
+	CODE_BLOCK_SCROLL_CONTAINER_CLASS,
+	CODE_BLOCK_WRAPPER_CLASS,
+	CODE_BLOCK_HEADER_CLASS,
+	CODE_BLOCK_ACTIONS_CLASS,
+	CODE_LANGUAGE_CLASS,
+	COPY_CODE_BTN_CLASS,
+	PREVIEW_CODE_BTN_CLASS,
+	RELATIVE_CLASS
+} from '$lib/constants/code-blocks';
 
 declare global {
 	interface Window {
@@ -42,7 +52,7 @@ function createCopyButton(codeId: string): Element {
 		type: 'element',
 		tagName: 'button',
 		properties: {
-			className: ['copy-code-btn'],
+			className: [COPY_CODE_BTN_CLASS],
 			'data-code-id': codeId,
 			title: 'Copy code',
 			type: 'button'
@@ -56,7 +66,7 @@ function createPreviewButton(codeId: string): Element {
 		type: 'element',
 		tagName: 'button',
 		properties: {
-			className: ['preview-code-btn'],
+			className: [PREVIEW_CODE_BTN_CLASS],
 			'data-code-id': codeId,
 			title: 'Preview code',
 			type: 'button'
@@ -75,18 +85,18 @@ function createHeader(language: string, codeId: string): Element {
 	return {
 		type: 'element',
 		tagName: 'div',
-		properties: { className: ['code-block-header'] },
+		properties: { className: [CODE_BLOCK_HEADER_CLASS] },
 		children: [
 			{
 				type: 'element',
 				tagName: 'span',
-				properties: { className: ['code-language'] },
+				properties: { className: [CODE_LANGUAGE_CLASS] },
 				children: [{ type: 'text', value: language }]
 			},
 			{
 				type: 'element',
 				tagName: 'div',
-				properties: { className: ['code-block-actions'] },
+				properties: { className: [CODE_BLOCK_ACTIONS_CLASS] },
 				children: actions
 			}
 		]
@@ -97,7 +107,7 @@ function createScrollContainer(preElement: Element): Element {
 	return {
 		type: 'element',
 		tagName: 'div',
-		properties: { className: ['code-block-scroll-container'] },
+		properties: { className: [CODE_BLOCK_SCROLL_CONTAINER_CLASS] },
 		children: [preElement]
 	};
 }
@@ -106,7 +116,7 @@ function createWrapper(header: Element, preElement: Element): Element {
 	return {
 		type: 'element',
 		tagName: 'div',
-		properties: { className: ['code-block-wrapper', 'relative'] },
+		properties: { className: [CODE_BLOCK_WRAPPER_CLASS, RELATIVE_CLASS] },
 		children: [header, createScrollContainer(preElement)]
 	};
 }
diff --git a/tools/server/webui/src/lib/services/chat.service.ts b/tools/server/webui/src/lib/services/chat.service.ts
index ebdd4374f8..9abe0515ff 100644
--- a/tools/server/webui/src/lib/services/chat.service.ts
+++ b/tools/server/webui/src/lib/services/chat.service.ts
@@ -1,5 +1,9 @@
 import { getJsonHeaders, formatAttachmentText, isAbortError } from '$lib/utils';
 import { AGENTIC_REGEX } from '$lib/constants/agentic';
+import {
+	ATTACHMENT_LABEL_PDF_FILE,
+	ATTACHMENT_LABEL_MCP_PROMPT
+} from '$lib/constants/attachment-labels';
 import { AttachmentType, ContentPartType, MessageRole, ReasoningFormat } from '$lib/enums';
 import type { ApiChatMessageContentPart, ApiChatCompletionToolCall } from '$lib/types/api';
 import type { DatabaseMessageExtraMcpPrompt } from '$lib/types';
@@ -764,7 +768,7 @@ export class ChatService {
 			} else {
 				contentParts.push({
 					type: ContentPartType.TEXT,
-					text: formatAttachmentText('PDF File', pdfFile.name, pdfFile.content)
+					text: formatAttachmentText(ATTACHMENT_LABEL_PDF_FILE, pdfFile.name, pdfFile.content)
 				});
 			}
 		}
@@ -778,7 +782,7 @@ export class ChatService {
 			contentParts.push({
 				type: ContentPartType.TEXT,
 				text: formatAttachmentText(
-					'MCP Prompt',
+					ATTACHMENT_LABEL_MCP_PROMPT,
 					mcpPrompt.name,
 					mcpPrompt.content,
 					mcpPrompt.serverName
diff --git a/tools/server/webui/src/lib/stores/chat.svelte.ts b/tools/server/webui/src/lib/stores/chat.svelte.ts
index 869206aa70..7bb5e3b5f4 100644
--- a/tools/server/webui/src/lib/stores/chat.svelte.ts
+++ b/tools/server/webui/src/lib/stores/chat.svelte.ts
@@ -432,7 +432,7 @@ class ChatStore {
 		return await DatabaseService.createMessageBranch(
 			{
 				convId: activeConv.id,
-				type: 'text',
+				type: MessageType.TEXT,
 				role: MessageRole.ASSISTANT,
 				content: '',
 				timestamp: Date.now(),
@@ -1234,7 +1234,7 @@ class ChatStore {
 			const assistantMessage = await DatabaseService.createMessageBranch(
 				{
 					convId: activeConv.id,
-					type: 'text',
+					type: MessageType.TEXT,
 					timestamp: Date.now(),
 					role: MessageRole.ASSISTANT,
 					content: '',