v0.2.0 — Phase β-1 Decks lesen

Deck-Liste mit Web-Parität: alle eigenen Decks aus cardecky-api,
Card-/Due-Counts pro Deck (Web-Pattern: separate Calls), Pull-to-
Refresh, Offline-Read via SwiftData, Inbox-Banner für Marketplace-
Forks.

- Deck-Codable-DTO mit snake_case-CodingKeys (DeckCategory,
  DeckVisibility, FsrsSettings)
- ISO8601-Date-Decoder mit Fractional-Seconds-Toleranz
- CardsAPI.listDecks() + cardCount() + dueCount()
- CachedDeck SwiftData-Model mit lastFetchedAt
- DeckListStore (API + Cache, paralleles Counts-Fetching via TaskGroup)
- DeckListView mit forest-Theme, deck.color-Streifen, Inbox-Banner
- AccountView mit Sign-out
- DashboardView durch DeckListView ersetzt
- 6 Unit-Tests + 1 UI-Test grün

Phasen-Plan: mana/docs/playbooks/CARDS_NATIVE_GREENFIELD.md

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Sources/Core/Storage/CachedDeck.swift

@@ -0,0 +1,79 @@
+import Foundation
+import SwiftData
+
+/// Lokales Cache-Model für Decks. Spiegelt das Server-DTO + zwei
+/// computed Werte (cardCount, dueCount), die Web pro Deck als zusätzliche
+/// API-Calls holt.
+///
+/// Offline-Read: Liste sichtbar ohne Netz. Server bleibt Wahrheit —
+/// alle Edits laufen über die API, der Cache wird nur beim Re-Fetch
+/// aktualisiert.
+@Model
+final class CachedDeck {
+    @Attribute(.unique) var id: String
+    var userId: String
+    var name: String
+    var deckDescription: String?
+    var color: String?
+    var categoryRaw: String?
+    var visibilityRaw: String
+    var contentHash: String?
+    var forkedFromMarketplaceDeckId: String?
+    var forkedFromMarketplaceVersionId: String?
+    var archivedAt: Date?
+    var createdAt: Date
+    var updatedAt: Date
+
+    /// Anzahl Karten im Deck (über `/api/v1/cards?deck_id=...`).
+    var cardCount: Int = 0
+
+    /// Anzahl fälliger Reviews (über `/api/v1/reviews/due?deck_id=...`).
+    var dueCount: Int = 0
+
+    /// Zeitpunkt des letzten erfolgreichen Server-Pulls für dieses Deck.
+    var lastFetchedAt: Date
+
+    init(deck: Deck, cardCount: Int = 0, dueCount: Int = 0) {
+        id = deck.id
+        userId = deck.userId
+        name = deck.name
+        deckDescription = deck.description
+        color = deck.color
+        categoryRaw = deck.category?.rawValue
+        visibilityRaw = deck.visibility.rawValue
+        contentHash = deck.contentHash
+        forkedFromMarketplaceDeckId = deck.forkedFromMarketplaceDeckId
+        forkedFromMarketplaceVersionId = deck.forkedFromMarketplaceVersionId
+        archivedAt = deck.archivedAt
+        createdAt = deck.createdAt
+        updatedAt = deck.updatedAt
+        self.cardCount = cardCount
+        self.dueCount = dueCount
+        lastFetchedAt = .now
+    }
+
+    /// Übernimmt aktualisierte Felder vom Server-DTO.
+    func update(from deck: Deck, cardCount: Int, dueCount: Int) {
+        name = deck.name
+        deckDescription = deck.description
+        color = deck.color
+        categoryRaw = deck.category?.rawValue
+        visibilityRaw = deck.visibility.rawValue
+        contentHash = deck.contentHash
+        forkedFromMarketplaceDeckId = deck.forkedFromMarketplaceDeckId
+        forkedFromMarketplaceVersionId = deck.forkedFromMarketplaceVersionId
+        archivedAt = deck.archivedAt
+        updatedAt = deck.updatedAt
+        self.cardCount = cardCount
+        self.dueCount = dueCount
+        lastFetchedAt = .now
+    }
+
+    var category: DeckCategory? {
+        categoryRaw.flatMap(DeckCategory.init(rawValue:))
+    }
+
+    var isFromMarketplace: Bool {
+        forkedFromMarketplaceDeckId != nil
+    }
+}