ui: Constants refactor (#26908)

* refactor: Constants

* refactor: Constants/Enums cleanup

* refactor: Constant objects instead of multiple single value constants

* refactor: Cleanup constants

tools/ui/src/lib/enums/attachment.enums.ts

@@ -47,6 +47,16 @@ export enum AttachmentAction {
 	MCP_RESOURCES_CLICK = 'onMcpResourcesClick'
 }
 
+/**
+ * Human-readable labels used when embedding attachments in outgoing messages.
+ */
+export enum AttachmentLabel {
+	FILE = 'File',
+	PDF_FILE = 'PDF File',
+	MCP_PROMPT = 'MCP Prompt',
+	MCP_RESOURCE = 'MCP Resource'
+}
+
 /**
  * Visibility conditions for attachment menu items.
  */