fix: resolve all linting errors and type issues

- Remove unused setShowOfflineIndicator calls
- Remove unused areAllRelaysLocal import
- Fix duplicate key 'failedRelays' in console.log
- Replace 'any' types with proper HighlightEvent interface
- Add eslint-disable comments for intentionally excluded useEffect dependencies
- All linting errors resolved, type checks pass

src/components/HighlightItem.tsx

@@ -140,8 +140,6 @@ export const HighlightItem: React.FC<HighlightItemProps> = ({
         setIsSyncing(syncingState)
         // When sync completes successfully, update highlight to show all relays
         if (!syncingState) {
-          setShowOfflineIndicator(false)
-          
           // Update the highlight with all relays after successful sync
           if (onHighlightUpdate && highlight.isLocalOnly && relayPool) {
             const updatedHighlight = {
@@ -285,9 +283,6 @@ export const HighlightItem: React.FC<HighlightItemProps> = ({
         onHighlightUpdate(updatedHighlight)
       }
       
-      // Update local state
-      setShowOfflineIndicator(false)
-      
     } catch (error) {
       console.error('❌ Failed to rebroadcast:', error)
     } finally {