Improve EventViewer UX

- Separate selected item from panel open state (closing panel keeps selection)
- Scroll selected item into view when detail panel opens
- Enter/Space opens detail panel, Escape closes it
- Remove browser focus outline on scroll container
- Add prefix prop to EventDetailHeader for labels
- Make timestamp optional in EventViewerRow
- Add close button to EventDetailHeader
- Fix title truncation with min-w-0
- Consolidate HttpResponseTimeline title generation
- Add ID/event labels to SSE detail header
- Remove fake timestamp from SSE events

Closes https://feedback.yaak.app/p/feedback-on-sse-viewer-ux-in-yaak

src-web/components/core/AutoScroller.tsx

@@ -80,7 +80,7 @@ export function AutoScroller<T>({
       {header ?? <span aria-hidden />}
       <div
         ref={containerRef}
-        className="h-full w-full overflow-y-auto"
+        className="h-full w-full overflow-y-auto focus:outline-none"
         onScroll={handleScroll}
         tabIndex={focusable ? 0 : undefined}
       >