refactor: use isLocalOnly instead of isOfflineCreated

- isLocalOnly is more accurate - covers both offline and online-but-local-only scenarios
- Update tooltip to 'Local relays only - will sync when remote relays available'
- Better semantic meaning: highlights only published to local relays
- Covers cases where user is online but only connected to local relays

src/components/HighlightItem.tsx

@@ -306,8 +306,8 @@ export const HighlightItem: React.FC<HighlightItemProps> = ({
       }
     }
     
-    // Check if this highlight was created offline (flight mode)
-    const isOfflineCreated = highlight.isOfflineCreated
+    // Check if this highlight was only published to local relays
+    const isLocalOnly = highlight.isLocalOnly
     
     // Show highlighter icon with relay info if available
     if (highlight.publishedRelays && highlight.publishedRelays.length > 0) {
@@ -315,8 +315,8 @@ export const HighlightItem: React.FC<HighlightItemProps> = ({
         url.replace(/^wss?:\/\//, '').replace(/\/$/, '')
       )
       return {
-        icon: isOfflineCreated ? faPlane : faHighlighter,
-        tooltip: isOfflineCreated ? 'Created offline - will sync when online' : relayNames.join('\n'),
+        icon: isLocalOnly ? faPlane : faHighlighter,
+        tooltip: isLocalOnly ? 'Local relays only - will sync when remote relays available' : relayNames.join('\n'),
         spin: false
       }
     }

src/services/highlightCreationService.ts

@@ -135,7 +135,7 @@ export async function createHighlight(
   // Convert to Highlight with relay tracking info and return IMMEDIATELY
   const highlight = eventToHighlight(signedEvent)
   highlight.publishedRelays = expectedSuccessRelays
-  highlight.isOfflineCreated = isLocalOnly
+  highlight.isLocalOnly = isLocalOnly
 
   return highlight
 }

src/types/highlights.ts

@@ -15,10 +15,10 @@ export interface Highlight {
   comment?: string // optional comment about the highlight
   // Level classification (computed based on user's context)
   level?: HighlightLevel
-  // Relay tracking for offline highlights
+  // Relay tracking for local-only highlights
   publishedRelays?: string[] // URLs of relays where this was published (for user-created highlights)
   seenOnRelays?: string[] // URLs of relays where this event was fetched from
-  isOfflineCreated?: boolean // true if created while in flight mode (offline)
+  isLocalOnly?: boolean // true if only published to local relays
   isSyncing?: boolean // true if currently being synced to remote relays
 }