fix: resolve navigation-cache regressions and todo UX

apps/lib/features/todo/data/todo_repository.dart

@@ -46,11 +46,7 @@ class TodoRepository {
     );
     if (cached != null) {
       final next = cached.value
-          .map(
-            (todo) => todo.id == id
-                ? todo.copyWith(status: 'completed', completedAt: now())
-                : todo,
-          )
+          .where((todo) => todo.id != id)
           .toList(growable: false);
       await store.write<CacheEntry<List<TodoResponse>>>(
         pendingListKey,
@@ -58,9 +54,9 @@ class TodoRepository {
       );
     }
 
-    invalidator.invalidate(pendingListKey);
     try {
       await api.completeTodo(id);
+      invalidator.invalidate(pendingListKey);
     } catch (error) {
       if (cached != null) {
         await store.write<CacheEntry<List<TodoResponse>>>(