lanework/KanbanMobile/App/MobileApp.swift

import SwiftUI

/// The iPhone app's entry point. Two tabs, per the mobile MVP charter: Boards (the whole
/// board → lane → card navigation stack) and Settings.
@main
struct MobileApp: App {

    /// **The app's root model, owned here and nowhere else** — the container home, the one
    /// `NSMetadataQuery` the process runs, and the per-board session cache. `@State` because the
    /// scene owns its lifetime; every screen reaches it through `.environment`, never by
    /// constructing one.
    @State private var boardIndex = BoardIndexStore()

    var body: some Scene {
        WindowGroup {
            RootTabView()
                .environment(boardIndex)
        }
    }
}

struct RootTabView: View {
    var body: some View {
        TabView {
            Tab("Boards", systemImage: "rectangle.stack") {
                BoardsTabView()
            }
            Tab("Settings", systemImage: "gearshape") {
                SettingsTabView()
            }
        }
    }
}