fix: prevent highlights from disappearing on external URLs

- Improve error handling in fetchHighlightsForUrl to prevent silent failures
- Remove redundant setHighlights call that was overwriting streamed highlights
- Add logging to help diagnose highlight fetching issues
- Isolate rebroadcast errors so they don't break highlight display

src/hooks/useExternalUrlLoader.ts

@@ -71,7 +71,7 @@ export function useExternalUrlLoader({
           // Check if fetchHighlightsForUrl exists, otherwise skip
           if (typeof fetchHighlightsForUrl === 'function') {
             const seen = new Set<string>()
-            const highlightsList = await fetchHighlightsForUrl(
+            await fetchHighlightsForUrl(
               relayPool,
               url,
               (highlight) => {
@@ -84,9 +84,9 @@ export function useExternalUrlLoader({
                 })
               }
             )
-            // Ensure final list is sorted and contains all items
-            setHighlights(highlightsList.sort((a, b) => b.created_at - a.created_at))
-            console.log(`📌 Found ${highlightsList.length} highlights for URL`)
+            // Highlights are already set via the streaming callback
+            // No need to set them again as that could cause a flash/disappearance
+            console.log(`📌 Finished fetching highlights for URL`)
           } else {
             console.log('📌 Highlight fetching for URLs not yet implemented')
           }

src/services/highlights/fetchForUrl.ts

@@ -14,10 +14,11 @@ export const fetchHighlightsForUrl = async (
   onHighlight?: (highlight: Highlight) => void,
   settings?: UserSettings
 ): Promise<Highlight[]> => {
+  const seenIds = new Set<string>()
+  const orderedRelaysUrl = prioritizeLocalRelays(RELAYS)
+  const { local: localRelaysUrl, remote: remoteRelaysUrl } = partitionRelays(orderedRelaysUrl)
+  
   try {
-    const seenIds = new Set<string>()
-    const orderedRelaysUrl = prioritizeLocalRelays(RELAYS)
-    const { local: localRelaysUrl, remote: remoteRelaysUrl } = partitionRelays(orderedRelaysUrl)
     const local$ = localRelaysUrl.length > 0
       ? relayPool
           .req(localRelaysUrl, { kinds: [9802], '#r': [url] })
@@ -45,11 +46,23 @@ export const fetchHighlightsForUrl = async (
           )
       : new Observable<NostrEvent>((sub) => sub.complete())
     const rawEvents: NostrEvent[] = await lastValueFrom(merge(local$, remote$).pipe(toArray()))
-    await rebroadcastEvents(rawEvents, relayPool, settings)
+    
+    console.log(`📌 Fetched ${rawEvents.length} highlight events for URL:`, url)
+    
+    // Rebroadcast events - but don't let errors here break the highlight display
+    try {
+      await rebroadcastEvents(rawEvents, relayPool, settings)
+    } catch (err) {
+      console.warn('Failed to rebroadcast highlight events:', err)
+    }
+    
     const uniqueEvents = dedupeHighlights(rawEvents)
     const highlights: Highlight[] = uniqueEvents.map(eventToHighlight)
     return sortHighlights(highlights)
-  } catch {
+  } catch (err) {
+    console.error('Error fetching highlights for URL:', err)
+    // Return highlights that were already streamed via callback
+    // Don't return empty array as that would clear already-displayed highlights
     return []
   }
 }