feat(usability): explain deleted bookings and linked transfer undo (U10)

src/Duempelkas.App/Components/Accounts/EntryTable.razor

@@ -1,3 +1,7 @@
+@if (Entries.Any(e => e.IsDeleted))
+{
+    <label class="history-toggle"><input type="checkbox" @bind="showDeleted" /> Gelöschte Buchungen anzeigen (@Entries.Count(e => e.IsDeleted))</label>
+}
 <div class="table-responsive entry-list">
     <table class="table table-hover table-sm align-middle">
         <thead class="table-light">
@@ -10,7 +14,7 @@
             </tr>
         </thead>
         <tbody>
-            @foreach (var entry in Entries)
+            @foreach (var entry in VisibleEntries)
             {
                 <EntryRow @key="entry.Id" Highlighted="@(entry.Id == HighlightedEntryId)" Entry="entry" OnDelete="OnDeleteEntry" OnRestore="OnRestoreEntry" OnEdit="OnEditEntry" />
             }
@@ -18,7 +22,7 @@
     </table>
 </div>
 
-@if (!Entries.Any())
+@if (!VisibleEntries.Any())
 {
     <div class="text-center py-3 text-muted">@EmptyMessage</div>
 }