refactor(#275): expose payload-less RevealPhase from HeaderPresenter

[GeneralD]

Closes #275

背景

HeaderPresenter.titleState / artistState は FetchState<String> で、decode の target 文字列 を public な @Published payload として保持していた。これは displayTitle / displayArtist と完全に重複しており、View は可視性ゲート（!= .idle）にしか使わず、target 自体は内部 dedup 専用だった。#273 で artworkData を private 化したのと同じ構造の問題。

変更

• payload なしの RevealPhase（.idle / .revealing / .revealed）を Entity に追加
• titleState / artistState → titlePhase / artistPhase: RevealPhase に置き換え
• dedup target を private titleTarget / artistTarget に分離
• HeaderView の可視性ゲートを titlePhase != .idle に更新
• tests は target payload assert（titleState == .success("Song")）を displayTitle + lifecycle 観測に置き換え

表示挙動・decode animation・artwork 表示は変更なし。

棚卸し（類似 Presenter state）

完了条件「類似する Presenter state を棚卸しし、残すものには理由がある」に対応。

Presenter	state	判定
Lyrics	lyricsState payload	残す — columns(in:) / updateActiveLineTick() が実データとして消費（doc 追記）
Wallpaper	isLoading	残す — debounce 元かつ lifecycle 観測対象（View 向けの showLoadingIndicator とは別物）
Ripple	isAnimating	残す — RippleView の TimelineView(paused:) が消費
App	layout	残す — window geometry、View 必須

唯一 payload を漏らしていたのは Header の titleState / artistState のみ。

テスト

swift test 全 937 件 green。

バージョン

2.13.18 → 2.13.19（patch / refactor）

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📥 Commits

Reviewing files that changed from the base of the PR and between 3aae13e and 7fc38de.

📒 Files selected for processing (9)

• .claude/CLAUDE.md
• Sources/Entity/RevealPhase.swift
• Sources/Presenters/Track/HeaderPresenter.swift
• Sources/Presenters/Track/LyricsPresenter.swift
• Sources/VersionHandler/Resources/version.txt
• Sources/Views/Header/HeaderView.swift
• Tests/PresentersTests/HeaderPresenterDuplicateTests.swift
• Tests/PresentersTests/HeaderPresenterTests.swift
• Tests/ViewsTests/ViewRenderingTests.swift

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• Create PR with unit tests
• Commit unit tests in branch refactor/275/presenter-state-separation

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