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>

project.yml

@@ -95,3 +95,20 @@ targets:
       base:
         PRODUCT_BUNDLE_IDENTIFIER: ev.mana.cards.uitests
         GENERATE_INFOPLIST_FILE: "YES"
+
+schemes:
+  CardsNative:
+    build:
+      targets:
+        CardsNative: all
+        CardsNativeTests: [test]
+        CardsNativeUITests: [test]
+    test:
+      targets:
+        - CardsNativeTests
+        - CardsNativeUITests
+      gatherCoverageData: false
+    run:
+      config: Debug
+    archive:
+      config: Release