feat: integrate sync status indicator into highlights panel

- Updated HighlightsTab to accept syncStatus and syncErrorMessage props
- Added SyncStatusIndicator component import and display in highlights panel
- Enhanced BibleReaderApp with sync status tracking state (synced/syncing/pending/error)
- Modified performSync function to update sync status based on result
- Updated VersDetailsPanel to pass sync status props through to HighlightsTab
- Sync status now visible to users in the Highlights tab with real-time updates

Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

components/bible/bible-reader-app.tsx

@@ -36,6 +36,8 @@ export function BibleReaderApp() {
   const [booksLoading, setBooksLoading] = useState(true)
   const [highlights, setHighlights] = useState<Map<string, BibleHighlight>>(new Map())
   const syncManager = useRef<HighlightSyncManager | null>(null)
+  const [syncStatus, setSyncStatus] = useState<'synced' | 'syncing' | 'pending' | 'error'>('synced')
+  const [syncError, setSyncError] = useState<string | null>(null)
 
   // Load books on mount or when locale changes
   useEffect(() => {
@@ -281,17 +283,19 @@ export function BibleReaderApp() {
     if (!syncManager.current) return
 
     try {
-      const pending = await syncManager.current.getPendingSyncItems()
-      if (pending.length === 0) return
+      setSyncStatus('syncing')
+      const result = await syncManager.current.performSync()
 
-      await syncManager.current.markSyncing(pending.map(h => h.id))
-
-      // TODO: POST to /api/highlights/bulk in Phase 2.1B
-
-      await syncManager.current.markSynced(pending.map(h => h.id))
+      if (result.errors > 0) {
+        setSyncStatus('error')
+        setSyncError(`Failed to sync ${result.errors} highlights`)
+      } else {
+        setSyncStatus('synced')
+        setSyncError(null)
+      }
     } catch (error) {
-      console.error('Sync failed:', error)
-      // Mark items with error status
+      setSyncStatus('error')
+      setSyncError(error instanceof Error ? error.message : 'Unknown error')
     }
   }
 
@@ -370,6 +374,8 @@ export function BibleReaderApp() {
         onHighlightVerse={handleHighlightVerse}
         onChangeHighlightColor={handleChangeHighlightColor}
         onRemoveHighlight={handleRemoveHighlight}
+        syncStatus={syncStatus}
+        syncErrorMessage={syncError || undefined}
       />
 
       {/* Settings panel */}

components/bible/highlights-tab.tsx

@@ -1,6 +1,7 @@
 'use client'
 import { Box, Button, Typography, Divider } from '@mui/material'
 import { BibleVerse, HighlightColor } from '@/types'
+import { SyncStatusIndicator } from './sync-status-indicator'
 
 const HIGHLIGHT_COLORS: HighlightColor[] = ['yellow', 'orange', 'pink', 'blue']
 
@@ -17,6 +18,8 @@ interface HighlightsTabProps {
   currentColor: HighlightColor | null
   onToggleHighlight: () => void
   onColorChange: (color: HighlightColor) => void
+  syncStatus?: 'synced' | 'syncing' | 'pending' | 'error'
+  syncErrorMessage?: string
 }
 
 export function HighlightsTab({
@@ -24,7 +27,9 @@ export function HighlightsTab({
   isHighlighted,
   currentColor,
   onToggleHighlight,
-  onColorChange
+  onColorChange,
+  syncStatus,
+  syncErrorMessage
 }: HighlightsTabProps) {
   if (!verse) return null
 
@@ -80,6 +85,18 @@ export function HighlightsTab({
 
           <Divider sx={{ my: 2 }} />
 
+          {syncStatus && (
+            <Box sx={{ mt: 2 }}>
+              <Typography variant="subtitle2" sx={{ mb: 1 }}>
+                Sync Status
+              </Typography>
+              <SyncStatusIndicator
+                status={syncStatus}
+                errorMessage={syncErrorMessage}
+              />
+            </Box>
+          )}
+
           <Typography variant="body2" color="textSecondary">
             You can highlight the same verse multiple times with different colors.
           </Typography>

components/bible/verse-details-panel.tsx

@@ -17,6 +17,8 @@ interface VersDetailsPanelProps {
   onHighlightVerse?: (color: HighlightColor) => void
   onChangeHighlightColor?: (color: HighlightColor) => void
   onRemoveHighlight?: () => void
+  syncStatus?: 'synced' | 'syncing' | 'pending' | 'error'
+  syncErrorMessage?: string
 }
 
 export function VersDetailsPanel({
@@ -31,6 +33,8 @@ export function VersDetailsPanel({
   onHighlightVerse,
   onChangeHighlightColor,
   onRemoveHighlight,
+  syncStatus,
+  syncErrorMessage,
 }: VersDetailsPanelProps) {
   const theme = useTheme()
   const isMobile = useMediaQuery(theme.breakpoints.down('sm'))
@@ -141,6 +145,8 @@ export function VersDetailsPanel({
               }
             }}
             onColorChange={(color) => onChangeHighlightColor?.(color)}
+            syncStatus={syncStatus}
+            syncErrorMessage={syncErrorMessage}
           />
         )}