webui: display prompt processing stats (#18146)

* webui: display prompt processing stats

* feat: Improve UI of Chat Message Statistics

* chore: update webui build output

* refactor: Post-review improvements

* chore: update webui build output

---------

Co-authored-by: Aleksander Grygier <aleksander.grygier@gmail.com>

tools/server/webui/src/lib/enums/chat.ts

@@ -0,0 +1,4 @@
+export enum ChatMessageStatsView {
+	GENERATION = 'generation',
+	READING = 'reading'
+}

tools/server/webui/src/lib/enums/index.ts

@@ -1,5 +1,7 @@
 export { AttachmentType } from './attachment';
 
+export { ChatMessageStatsView } from './chat';
+
 export {
 	FileTypeCategory,
 	FileTypeImage,