debug: add comprehensive logging for reading position calculation and event publishing

- Add logs in useReadingPosition: scroll position calculation (throttled to 5% changes)
- Add logs for scheduling and triggering auto-save
- Add detailed logs in ContentPanel handleSavePosition
- Add logs in saveReadingPosition: event creation, signing, publishing
- Add logs in publishEvent: event store addition, relay status, publishing
- All logs prefixed with [progress] for easy filtering
- Shows complete flow from scroll → calculate → save → create event → publish to relays

src/components/ContentPanel.tsx

@@ -151,7 +151,7 @@ const ContentPanel: React.FC<ContentPanelProps> = ({
   // Callback to save reading position
   const handleSavePosition = useCallback(async (position: number) => {
     if (!activeAccount || !relayPool || !eventStore || !articleIdentifier) {
-      console.log('⏭️ [ContentPanel] Skipping save - missing requirements:', {
+      console.log('[progress] ⏭️ ContentPanel: Skipping save - missing requirements:', {
         hasAccount: !!activeAccount,
         hasRelayPool: !!relayPool,
         hasEventStore: !!eventStore,
@@ -160,11 +160,18 @@ const ContentPanel: React.FC<ContentPanelProps> = ({
       return
     }
     if (!settings?.syncReadingPosition) {
-      console.log('⏭️ [ContentPanel] Sync disabled in settings')
+      console.log('[progress] ⏭️ ContentPanel: Sync disabled in settings')
       return
     }
 
-    console.log('💾 [ContentPanel] Saving position:', Math.round(position * 100) + '%', 'for article:', selectedUrl?.slice(0, 50))
+    const scrollTop = window.pageYOffset || document.documentElement.scrollTop
+    console.log('[progress] 💾 ContentPanel: Saving position:', {
+      position,
+      percentage: Math.round(position * 100) + '%',
+      scrollTop,
+      articleIdentifier: articleIdentifier.slice(0, 50) + '...',
+      url: selectedUrl?.slice(0, 50)
+    })
 
     try {
       const factory = new EventFactory({ signer: activeAccount })
@@ -176,11 +183,12 @@ const ContentPanel: React.FC<ContentPanelProps> = ({
         {
           position,
           timestamp: Math.floor(Date.now() / 1000),
-          scrollTop: window.pageYOffset || document.documentElement.scrollTop
+          scrollTop
         }
       )
+      console.log('[progress] ✅ ContentPanel: Save completed successfully')
     } catch (error) {
-      console.error('❌ [ContentPanel] Failed to save reading position:', error)
+      console.error('[progress] ❌ ContentPanel: Failed to save reading position:', error)
     }
   }, [activeAccount, relayPool, eventStore, articleIdentifier, settings?.syncReadingPosition, selectedUrl])