Integrate WelcomeFeature into AppFeature + rewrite WelcomeView

[kirich1409]

Summary

• AppFeature.State.Route.welcome now carries WelcomeFeature.State; added routeWelcome computed property mirroring routeMain and scoped the child reducer via .ifLet(\.routeWelcome, action: \.welcome).
• welcome(.delegate(.projectSelected(url))) is forwarded to .openProject(url), preserving the existing project-open pipeline.
• Default AppFeature.State route is now .welcome(WelcomeFeature.State()) — app launches with the Welcome screen by default.
• WelcomeView rewritten to consume StoreOf<WelcomeFeature> — removed @Query, @Environment(\.modelContext), and direct ProjectRepository instantiation. All project ops (open recent, toggle favorite, remove) now go through the store.
• RecentProjectRow updated to accept ProjectInfo (value type) instead of ProjectModel (SwiftData @model).
• AppRootView scopes into the welcome store via store.scope(state: \.routeWelcome, action: \.welcome).

Closes #144

Test plan

• xcodebuild build — BUILD SUCCEEDED
• swiftlint lint --strict — 0 violations in 146 files
• xcodebuild test — all unit tests pass (including WelcomeFeatureTests)
• Manual: launch app → Welcome appears; Open Project opens folder picker; Recent row opens project; favorite toggle + remove work end-to-end

Note: RelayUITests failures are pre-existing on main (worktree sidebar timeout unrelated to routing) and not introduced by this change.

Board item ID: PVTI_lADOA59kY84BUaDazgqBrek

[Copilot]

Pull request overview

This PR integrates WelcomeFeature into the app-level router (AppFeature) and rewrites the Welcome UI to be fully driven by TCA state/actions, removing direct SwiftData/repository access from the view layer.

Changes:

• Updates AppFeature.State.Route.welcome to carry WelcomeFeature.State, adds routeWelcome, and scopes WelcomeFeature via .ifLet.
• Forwards WelcomeFeature’s delegate event (projectSelected) into the existing .openProject(url) routing pipeline.
• Rewrites WelcomeView to take StoreOf<WelcomeFeature> and routes all recent-project interactions through feature actions, with RecentProjectRow now using ProjectInfo.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
MacApp/Relay/AppFeature.swift	Adds Welcome route state + reducer scoping and forwards delegate selection into .openProject.
MacApp/Relay/AppRootView.swift	Scopes and renders WelcomeView from the Welcome route.
MacApp/Relay/Welcome/WelcomeView.swift	Converts Welcome UI to StoreOf<WelcomeFeature> and moves project operations into TCA actions using ProjectInfo.

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