fix: reduce ClickHouse CPU by increasing flush interval, rename LIVE→AUTO labels

- Increase ingestion flush interval from 500ms to 5000ms to reduce MV merge storms
- Reduce ClickHouse background_schedule_pool_size from 8 to 4
- Rename LIVE/PAUSED badge labels to AUTO/MANUAL across all pages
- Update design system to v0.1.29

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ui/src/api/queries/use-refresh-interval.ts

@@ -10,9 +10,9 @@ export function useRefreshInterval(intervalMs: number): number | false {
 }
 
 /**
- * Returns `enabled` and `refetchInterval` tied to the LIVE/PAUSED toggle.
- * - LIVE: enabled=true, refetchInterval=intervalMs (fetch + poll)
- * - PAUSED: enabled=true, refetchInterval=false (fetch once, no polling)
+ * Returns `enabled` and `refetchInterval` tied to the AUTO/MANUAL toggle.
+ * - AUTO: enabled=true, refetchInterval=intervalMs (fetch + poll)
+ * - MANUAL: enabled=true, refetchInterval=false (fetch once, no polling)
  */
 export function useLiveQuery(intervalMs: number) {
   const { autoRefresh } = useGlobalFilters();