Exercise 2: A Real BrandAccent Color Set Used in TaskListView — Possible Solution
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Steps (in Xcode):

1. In Assets.xcassets, add a new Color Set named BrandAccent.
2. In the Attributes Inspector, change "Appearances" from "None" to
   "Any, Dark" - this splits the color into two real, distinct
   slots: "Any Appearance" and "Dark".
3. Set the "Any Appearance" slot to a real light-mode-appropriate
   color (e.g. a deep green), and the "Dark" slot to a real,
   distinct dark-mode-appropriate color (e.g. a lighter, more
   saturated green that reads better against a dark background).

// Using it in TaskListView:
.navigationTitle("TaskFlow")
.toolbarColorScheme(.light, for: .navigationBar) // optional, illustrative only
// A more direct, real usage - styling the title text itself:
.toolbarBackground(Color("BrandAccent"), for: .navigationBar)

// Or, more simply, applied to a visible element within the view:
Text("TaskFlow")
    .font(.largeTitle)
    .foregroundStyle(Color("BrandAccent"))

HOW IT WORKS: Defining BrandAccent as a real Color Set with separate
"Any Appearance" and "Dark" values means Color("BrandAccent") is a
single, real, named reference that automatically resolves to whichever
of the two defined values matches the system's own current real
appearance setting - no manual @Environment(\.colorScheme) check or
if/else branching is needed anywhere in the view code itself, exactly
as the chapter's own established pattern demonstrated.

Using Color("BrandAccent") directly in TaskListView (whether applied
to a Text view's own foregroundStyle, or to the navigation bar's own
background) means the color genuinely adapts on its own the moment the
user switches between light and dark mode, or when the system's own
appearance setting changes for any other real reason - a single line
of usage automatically stays correct as the appearance changes, with
zero further code needed.

ANSWER: A Color Set named BrandAccent, defined with distinct "Any
Appearance" and "Dark" values in the asset catalog, and referenced via
Color("BrandAccent") inside TaskListView, correctly adapts the
displayed color automatically between light and dark mode with no
manual appearance-checking code required anywhere in the view.

WHY THIS WORKS AS AN ANSWER
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This correctly defines a real, appearance-aware Color Set and applies
it in the view using the chapter's own established Color("...") usage
pattern, demonstrating the automatic light/dark resolution directly.