feat: improve relay hint selection to exclude non-content relays

- Add NON_CONTENT_RELAYS list and isContentRelay helper to classify relays
- Update ContentPanel to filter out non-content relays (e.g., relay.nsec.app) from naddr hints
- Update HighlightItem to prefer publishedRelays/seenOnRelays and filter using isContentRelay
- Ensures relay.nsec.app and other auth/utility relays are never suggested as content hints

src/components/ContentPanel.tsx

@@ -12,6 +12,8 @@ import { nip19 } from 'nostr-tools'
 import { getNostrUrl, getSearchUrl } from '../config/nostrGateways'
 import { RelayPool } from 'applesauce-relay'
 import { getActiveRelayUrls } from '../services/relayManager'
+import { isContentRelay } from '../config/relays'
+import { isLocalRelay } from '../utils/helpers'
 import { IAccount } from 'applesauce-accounts'
 import { NostrEvent } from 'nostr-tools'
 import { Highlight } from '../types/highlights'
@@ -432,9 +434,10 @@ const ContentPanel: React.FC<ContentPanelProps> = ({
 
     const dTag = currentArticle.tags.find(t => t[0] === 'd')?.[1] || ''
     const activeRelays = relayPool ? getActiveRelayUrls(relayPool) : []
-    const relayHints = activeRelays.filter(r => 
+    const relayHints = activeRelays
-      !r.includes('localhost') && !r.includes('127.0.0.1')
+      .filter(url => !isLocalRelay(url))
-    ).slice(0, 3)
+      .filter(url => isContentRelay(url))
+      .slice(0, 3)
 
     const naddr = nip19.naddrEncode({
       kind: 30023,

src/components/HighlightItem.tsx

@@ -10,6 +10,7 @@ import { Hooks } from 'applesauce-react'
 import { onSyncStateChange, isEventSyncing, isEventOfflineCreated } from '../services/offlineSyncService'
 import { areAllRelaysLocal, isLocalRelay } from '../utils/helpers'
 import { getActiveRelayUrls } from '../services/relayManager'
+import { isContentRelay } from '../config/relays'
 import { nip19 } from 'nostr-tools'
 import { formatDateCompact } from '../utils/bookmarkUtils'
 import { createDeletionRequest } from '../services/deletionService'
@@ -224,11 +225,23 @@ export const HighlightItem: React.FC<HighlightItemProps> = ({
   
   const getHighlightLinks = () => {
     // Encode the highlight event itself (kind 9802) as a nevent
-    // Get non-local relays for the hint
+    // Prefer relays we actually published to or saw the event on
+    const publishedRelays = highlight.publishedRelays || []
+    const seenOnRelays = highlight.seenOnRelays || []
+    
+    // Use published relays if available, else seen relays, else fall back to active relays
+    const baseRelays = publishedRelays.length > 0
+      ? publishedRelays
+      : (seenOnRelays.length > 0 ? seenOnRelays : [])
+    
     const activeRelays = relayPool ? getActiveRelayUrls(relayPool) : []
-    const relayHints = activeRelays.filter(r => 
+    const candidates = baseRelays.length > 0 ? baseRelays : activeRelays
-      !r.includes('localhost') && !r.includes('127.0.0.1')
+    
-    ).slice(0, 3) // Include up to 3 relay hints
+    // Filter to content-capable remote relays
+    const relayHints = candidates
+      .filter(url => !isLocalRelay(url))
+      .filter(url => isContentRelay(url))
+      .slice(0, 3) // Include up to 3 relay hints
     
     const nevent = nip19.neventEncode({
       id: highlight.id,

src/config/relays.ts

@@ -19,3 +19,20 @@ export const RELAYS = [
   'wss://proxy.nostr-relay.app/5d0d38afc49c4b84ca0da951a336affa18438efed302aeedfa92eb8b0d3fcb87',
 ]
 
+/**
+ * Relays that should NOT be used as content hints (auth/signer, etc.)
+ * These relays are fine for connection and other purposes, but shouldn't
+ * be suggested as places where posts/highlights are likely to be found.
+ */
+export const NON_CONTENT_RELAYS = [
+  'wss://relay.nsec.app',
+]
+
+/**
+ * Check if a relay URL is suitable for use as a content hint
+ * Returns true for remote relays that are reasonable for posts/highlights
+ */
+export function isContentRelay(url: string): boolean {
+  return !NON_CONTENT_RELAYS.includes(url)
+}
+