fix(#316): hide ads when opening a post via widget, push, deeplink, or shortcut

[cassio-rossi]

Closes #316

Problem

Opening a post from in-app navigation correctly hides ads for users who purchased ad removal. Opening the same post via widget, push notification, deeplink, or Home Screen shortcut still shows ads.

Root cause

Ad removal is driven by the patr cookie, written by MMWebView from @Environment(\.removeAds) (MMWebView.swift:7, 182-187). Default value is false (EnvironmentValuesExtensions.swift:26).

\.removeAds is injected only on the MainView subtree (MacMagazineApp.swift:134). All four external entry points set viewModel.deepLinkPostURL, presented by a single .fullScreenCover attached at the SceneView.body level (MacMagazineApp.swift:55-66) — a sibling of MainView, not a descendant. So DeepLinkNewsDetailView → MMWebView read the default false and wrote patr="false", showing ads.

\.theme is injected at the body level, which is why the deeplink article was themed correctly but ads were not hidden — a confirming detail.

Fix

Re-inject \.removeAds on the fullScreenCover content, alongside the modelContainer and analytics dependencies already re-injected there. One line fixes all four entry points, since they share one presentation.

DeepLinkNewsDetailView(url: url) { viewModel.deepLinkPostURL = nil }
    .modelContainer(viewModel.storage.sharedModelContainer)
    .environment(\.removeAds, viewModel.settingsViewModel.removeAds)   // added
    .environmentObject(viewModel.analytics)

Paths covered (all share the same cover)

• Widget / deeplink — onOpenURL (MacMagazineApp.swift:48)
• Push — newContentAvailable + cold-launch .task (MacMagazineApp.swift:76,104)
• Shortcut — shortcutManager.url (MacMagazineApp.swift:85)

Testing

• The cookie contract this relies on is already covered by CookiesTests.makeCookiesRemoveAds / makeCookiesNoRemoveAds. The fix itself is SwiftUI environment-tree wiring (not unit-testable per .claude/rules/testing.md), so no new test was added.
• Build succeeded (iPhone 17 Pro Max sim, OS 26.5 — iPhone 17 Pro not installed on this machine).
• Full MacMagazine test plan: 491 passed, 0 failed.
• swiftlint --strict: 0 violations.

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