feat(v1.8.0): IMPL_022 Multi-Client Deletion Enhancement

Defensive improvements for server deletion detection:

1. Enhanced logging in detectServerDeletions():
   - Statistics: server/local/synced note counts
   - Summary log when deletions found

2. Explicit documentation:
   - Comment clarifying checklists are included
   - Both Notes and Checklists use same detection mechanism

3. Sync banner now shows deletion count:
   - '3 synced · 2 deleted on server'
   - New strings: sync_deleted_on_server_count (en + de)

4. DELETED_ON_SERVER → PENDING on edit:
   - Verified existing logic works correctly
   - All edited notes → PENDING (re-upload to server)
   - Added comments for clarity

Cross-client analysis confirmed:
- ✅ Android/Desktop/Web deletions detected correctly
- ⚠️ Obsidian .md-only deletions not detected (by design: JSON = source of truth)

IMPL_022_MULTI_CLIENT_DELETION.md

android/app/src/main/java/dev/dettmer/simplenotes/sync/WebDavSyncService.kt

@@ -1055,6 +1055,10 @@ class WebDavSyncService(private val context: Context) {
      * Keine zusätzlichen HTTP-Requests! Nutzt die bereits geladene
      * serverNoteIds-Liste aus dem PROPFIND-Request.
      * 
+     * Prüft ALLE Notizen (Notes + Checklists), da beide als
+     * JSON in /notes/{id}.json gespeichert werden.
+     * NoteType (NOTE vs CHECKLIST) spielt keine Rolle für die Detection.
+     * 
      * @param serverNoteIds Set aller Note-IDs auf dem Server (aus PROPFIND)
      * @param localNotes Alle lokalen Notizen
      * @return Anzahl der als DELETED_ON_SERVER markierten Notizen
@@ -1064,23 +1068,35 @@ class WebDavSyncService(private val context: Context) {
         localNotes: List<Note>
     ): Int {
         var deletedCount = 0
+        val syncedNotes = localNotes.filter { it.syncStatus == SyncStatus.SYNCED }
         
-        localNotes.forEach { note ->
+        // 🆕 v1.8.0 (IMPL_022): Statistik-Log für Debugging
+        Logger.d(TAG, "🔍 detectServerDeletions: " +
+            "serverNotes=${serverNoteIds.size}, " +
+            "localSynced=${syncedNotes.size}, " +
+            "localTotal=${localNotes.size}")
+        
+        syncedNotes.forEach { note ->
             // Nur SYNCED-Notizen prüfen:
             // - LOCAL_ONLY: War nie auf Server → irrelevant
             // - PENDING: Soll hochgeladen werden → nicht überschreiben
             // - CONFLICT: Wird separat behandelt
             // - DELETED_ON_SERVER: Bereits markiert
-            if (note.syncStatus == SyncStatus.SYNCED && note.id !in serverNoteIds) {
+            if (note.id !in serverNoteIds) {
                 val updatedNote = note.copy(syncStatus = SyncStatus.DELETED_ON_SERVER)
                 storage.saveNote(updatedNote)
                 deletedCount++
                 
-                Logger.d(TAG, "Note '${note.title}' (${note.id}) " +
+                Logger.d(TAG, "🗑️ Note '${note.title}' (${note.id}) " +
                     "was deleted on server, marked as DELETED_ON_SERVER")
             }
         }
         
+        if (deletedCount > 0) {
+            Logger.d(TAG, "📊 Server deletion detection complete: " +
+                "$deletedCount of ${syncedNotes.size} synced notes deleted on server")
+        }
+        
         return deletedCount
     }
     

android/app/src/main/java/dev/dettmer/simplenotes/ui/editor/NoteEditorViewModel.kt

@@ -231,6 +231,8 @@ class NoteEditorViewModel(
                     }
                     
                     val note = if (existingNote != null) {
+                        // 🆕 v1.8.0 (IMPL_022): syncStatus wird immer auf PENDING gesetzt
+                        // beim Bearbeiten - gilt für SYNCED, CONFLICT, DELETED_ON_SERVER, etc.
                         existingNote!!.copy(
                             title = title,
                             content = content,
@@ -272,6 +274,8 @@ class NoteEditorViewModel(
                     }
                     
                     val note = if (existingNote != null) {
+                        // 🆕 v1.8.0 (IMPL_022): syncStatus wird immer auf PENDING gesetzt
+                        // beim Bearbeiten - gilt für SYNCED, CONFLICT, DELETED_ON_SERVER, etc.
                         existingNote!!.copy(
                             title = title,
                             content = "", // Empty for checklists

android/app/src/main/java/dev/dettmer/simplenotes/ui/main/MainViewModel.kt

@@ -559,10 +559,18 @@ class MainViewModel(application: Application) : AndroidViewModel(application) {
                 }
                 
                 if (result.isSuccess) {
-                    val bannerMessage = if (result.syncedCount > 0) {
+                    // 🆕 v1.8.0 (IMPL_022): Erweiterte Banner-Nachricht mit Löschungen
-                        getString(R.string.toast_sync_success, result.syncedCount)
+                    val bannerMessage = buildString {
-                    } else {
+                        if (result.syncedCount > 0) {
-                        getString(R.string.snackbar_nothing_to_sync)
+                            append(getString(R.string.toast_sync_success, result.syncedCount))
+                        }
+                        if (result.deletedOnServerCount > 0) {
+                            if (isNotEmpty()) append(" · ")
+                            append(getString(R.string.sync_deleted_on_server_count, result.deletedOnServerCount))
+                        }
+                        if (isEmpty()) {
+                            append(getString(R.string.snackbar_nothing_to_sync))
+                        }
                     }
                     SyncStateManager.markCompleted(bannerMessage)
                     loadNotes()

android/app/src/main/res/values-de/strings.xml

@@ -73,6 +73,9 @@
     <string name="sync_legend_deleted_label">Auf Server gelöscht</string>
     <string name="sync_legend_deleted_desc">Diese Notiz wurde auf einem anderen Gerät oder direkt auf dem Server gelöscht. Sie existiert noch lokal.</string>
     
+    <!-- 🆕 v1.8.0 (IMPL_022): Sync-Banner Löschungsanzahl -->
+    <string name="sync_deleted_on_server_count">%d auf Server gelöscht</string>
+    
     <!-- ============================= -->
     <!-- DELETE DIALOGS                -->
     <!-- ============================= -->

android/app/src/main/res/values/strings.xml

@@ -80,6 +80,9 @@
     <string name="sync_legend_deleted_label">Deleted on server</string>
     <string name="sync_legend_deleted_desc">This note was deleted on another device or directly on the server. It still exists locally.</string>
     
+    <!-- 🆕 v1.8.0 (IMPL_022): Sync banner deletion count -->
+    <string name="sync_deleted_on_server_count">%d deleted on server</string>
+    
     <!-- ============================= -->
     <!-- DELETE DIALOGS                -->
     <!-- ============================= -->