Integrate WelcomeFeature into AppFeature + rewrite WelcomeView

[kirich1409]

Epic: Welcome Screen (#139)

Task ID: T-3 · Wave: 2 · Complexity: M

Описание

Интегрировать WelcomeFeature в AppFeature routing и переписать WelcomeView на TCA.

1. AppFeature.State.Route.welcome → .welcome(WelcomeFeature.State)
2. routeWelcome computed property (аналогично routeMain)
3. Scope через .ifLet(\.routeWelcome, action: \.welcome)
4. Delegate: .welcome(.delegate(.projectSelected(url))) → .openProject(url)
5. Переписать WelcomeView: убрать @query, @Environment(.modelContext), ProjectRepository. Принимать StoreOf<WelcomeFeature>.
6. RecentProjectRow принимает ProjectInfo вместо ProjectModel
7. Default init: .welcome(WelcomeFeature.State())

Module: MacApp/Relay/AppFeature.swift, MacApp/Relay/AppRootView.swift, MacApp/Relay/Welcome/

Acceptance Criteria

• AppFeature.Route.welcome(WelcomeFeature.State) компилируется
• WelcomeView принимает StoreOf<WelcomeFeature>, не содержит @query / @Environment(.modelContext) / ProjectRepository
• RecentProjectRow принимает ProjectInfo
• Открытие проекта (recent + folder) end-to-end
• Favorites toggle и удаление работают
• Приложение стартует с Welcome Screen по умолчанию

Dependencies

• Cloud: replace git worktree with git clone for session isolation #140 (T-1: WelcomeFeature reducer)