fix: Sync-Indikator Listener-Cleanup und CSS-Zustände

useSyncIndicator gibt die Unsubscribe-Funktion von subscribeToSyncState
zurück. conn-status-Klassen berücksichtigen jetzt auch den aktiven
Sync-Lauf (syncing) statt nur die Queue-Länge.

Co-authored-by: Cursor <cursoragent@cursor.com>

client/src/App.css

@@ -2172,6 +2172,12 @@ html.scheme-dark .themed-select-option.is-selected {
   100% { background-position: 0 0; }
 }
 
+.conn-status.syncing {
+  background: rgba(59, 130, 246, 0.1);
+  color: #60a5fa;
+  border: 1px solid rgba(59, 130, 246, 0.25);
+}
+
 .conn-status.warning {
   background: rgba(251, 191, 36, 0.1);
   color: #fbbf24;

client/src/components/LogbookDashboard.tsx

@@ -31,7 +31,7 @@ export default function LogbookDashboard({ onSelectLogbook, onLogout, onOpenProf
   const [online, setOnline] = useState(navigator.onLine)
   const [username] = useState(localStorage.getItem('active_username') || 'Skipper')
 
-  const { pendingCount, showSpinner, showPendingWarning } = useSyncIndicator()
+  const { pendingCount, showSpinner, showPendingWarning, connStatusClassName } = useSyncIndicator()
 
   // Listen to connectivity changes
   useEffect(() => {
@@ -271,7 +271,7 @@ export default function LogbookDashboard({ onSelectLogbook, onLogout, onOpenProf
         <div className="header-actions">
           {/* Connection Indicator */}
           <div
-            className={`conn-status ${online ? (pendingCount > 0 ? 'unsynced' : 'online') : 'offline'}`}
+            className={connStatusClassName(online)}
             title={
               online
                 ? showSpinner

client/src/components/UserProfilePage.tsx

@@ -129,7 +129,12 @@ export default function UserProfilePage({ onBack, onLogout }: UserProfilePagePro
   const [pendingRecoveryPhrase, setPendingRecoveryPhrase] = useState<string | null>(null)
   const [recoveryCopied, setRecoveryCopied] = useState(false)
 
-  const { pendingCount: pendingSyncCount, showSpinner, showPendingWarning } = useSyncIndicator()
+  const {
+    pendingCount: pendingSyncCount,
+    showSpinner,
+    showPendingWarning,
+    connStatusClassName
+  } = useSyncIndicator()
 
   const sharedLogbookCount = useLiveQuery(
     () => db.logbooks.filter((lb) => lb.isShared === 1).count(),
@@ -528,7 +533,7 @@ export default function UserProfilePage({ onBack, onLogout }: UserProfilePagePro
                 <h3>{t('profile.device_title')}</h3>
               </div>
               <p className="profile-section-desc">{t('profile.device_desc')}</p>
-              <div className={`profile-device-status conn-status ${online ? (pendingSyncCount > 0 ? 'warning' : 'online') : 'offline'}`}>
+              <div className={`profile-device-status ${connStatusClassName(online)}`}>
                 {online ? (
                   showSpinner ? (
                     <>

client/src/hooks/useSyncIndicator.ts

@@ -3,6 +3,20 @@ import { useLiveQuery } from 'dexie-react-hooks'
 import { db } from '../services/db.js'
 import { subscribeToSyncState } from '../services/sync.js'
 
+export type SyncConnStatusVariant = 'offline' | 'syncing' | 'pending' | 'online'
+
+/** Maps sync/online state to conn-status CSS modifier classes. */
+export function syncConnStatusClassName(
+  online: boolean,
+  showSpinner: boolean,
+  pendingCount: number
+): string {
+  if (!online) return 'conn-status offline'
+  if (showSpinner) return 'conn-status syncing'
+  if (pendingCount > 0) return 'conn-status warning'
+  return 'conn-status online'
+}
+
 /** Sync queue depth and whether a sync pass is running (for header indicators). */
 export function useSyncIndicator(logbookId?: string | null) {
   const [isSyncing, setIsSyncing] = useState(false)
@@ -16,13 +30,19 @@ export function useSyncIndicator(logbookId?: string | null) {
       [logbookId]
     ) ?? 0
 
-  useEffect(() => subscribeToSyncState(setIsSyncing), [])
+  useEffect(() => {
+    return subscribeToSyncState(setIsSyncing)
+  }, [])
+
+  const showSpinner = isSyncing
+  const showPendingWarning = pendingCount > 0 && !isSyncing
 
   return {
     isSyncing,
     pendingCount,
-    /** Spin only while a sync pass is active — not for stale queue counts. */
-    showSpinner: isSyncing,
-    showPendingWarning: pendingCount > 0 && !isSyncing
+    showSpinner,
+    showPendingWarning,
+    connStatusClassName: (online: boolean) =>
+      syncConnStatusClassName(online, showSpinner, pendingCount)
   }
 }