Exercise 1: Swipe-to-Delete with onDelete(perform:) — Possible Solution
==============================================================================

// Added to TaskStore:
func delete(at offsets: IndexSet) {
    tasks.remove(atOffsets: offsets)
}

// Updated TaskListView's List:
List {
    Section {
        QuoteHeaderView()
    }
    Section("Tasks") {
        ForEach(store.tasks) { task in
            NavigationLink(value: task) {
                TaskRow(task: task)
            }
        }
        .onDelete { offsets in
            store.delete(at: offsets)
        }
    }
}

HOW IT WORKS: TaskStore.delete(at:) takes a real IndexSet - the exact
type SwiftUI's own real .onDelete(perform:) modifier hands back when
the user performs a swipe-to-delete gesture on one or more rows -
and forwards it directly to Array's own real remove(atOffsets:)
method, which removes every element at those specific positions from
tasks in one call.

.onDelete is attached directly to the ForEach (not the whole List or
Section), which is the real, required placement - it needs to know
specifically which dynamic, ForEach-generated rows the deletion
gesture applies to. Because tasks is a property on the shared
@Observable TaskStore, removing an item there automatically updates
every view holding that same store instance (per this chapter's own
finding-box) - TaskListView's own List immediately reflects the
deletion with no separate refresh step needed.

ANSWER: Adding func delete(at offsets: IndexSet) to TaskStore (calling
tasks.remove(atOffsets: offsets)) and attaching .onDelete { store.delete(at: $0) }
directly to the ForEach inside the "Tasks" Section correctly enables
real swipe-to-delete, with the shared @Observable store automatically
propagating the removal back to the list's own display.

WHY THIS WORKS AS AN ANSWER
------------------------------
This correctly implements the real onDelete(perform:) pattern attached
to the ForEach specifically, and forwards the resulting IndexSet to a
new TaskStore method using the real, matching Array API.