v0.8.0 — Phase β-7 App-Store-Vorbereitung

Feature-komplett für TestFlight. App-Icon-Platzhalter, Siri-Shortcut,
Share-Extension, Release-Checklist mit allen externen Apple-Schritten.

- scripts/make-appicon.swift: CoreGraphics-basierter Generator für
  1024×1024 forest-green PNG mit "C"-Letter und Karten-Stack-Schatten
- Asset-Catalog auf Single-Size-AppIcon-Pattern umgestellt
- StudyCardsIntent + CardsAppShortcuts (App Intents): Siri-
  Shortcut "Karten lernen mit Cards" / "Mit Cards lernen"
- CardsShareExtension Target: ShareViewController (UIKit-Bootstrap +
  SwiftUI-Hosting), ShareEditorView mit Text-Edit
- PendingShare + PendingShareStore shared in App-Group
  group.ev.mana.cards
- DeckListView zeigt PendingShare-Banner; Tap navigiert zu
  PendingShareConsumeView mit Deck-Picker + Front/Back-Felder, Submit
  → POST /cards, danach store.remove
- Info.plist: NSPhotoLibraryUsageDescription für Image-Occlusion-
  Picker, NSUserActivityTypes für Universal-Links
- docs/RELEASE_CHECKLIST.md mit externen Schritten: Apple-Developer-
  Portal, App-IDs, App-Group, AASA, Xcode-Archive, TestFlight-Plan,
  App-Store-Connect-Felder, Compliance-Verifikation
- UI-Test robuster (akzeptiert Login oder Decks/Entdecken als
  Launch-Erfolg, unabhängig vom Simulator-Keychain-State)
- 35 Tests + 1 UI-Test grün, alle drei Targets bauen

App-Store-Submission selbst ist externe Aktion und passiert nicht
durch dieses Repo — Schritte in docs/RELEASE_CHECKLIST.md.

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

ShareExtension/ShareViewController.swift

@@ -0,0 +1,78 @@
+import SwiftUI
+import UIKit
+import UniformTypeIdentifiers
+
+/// Share-Extension-Entrypoint. Liest geteilten Text/URL aus
+/// `extensionContext`, persistiert als `PendingShare` in der App-Group,
+/// schließt sich nach Bestätigung.
+final class ShareViewController: UIViewController {
+    private var sharedText: String = ""
+    private var sharedURL: String?
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        view.backgroundColor = .systemBackground
+        loadSharedContent { [weak self] in
+            self?.presentEditor()
+        }
+    }
+
+    private func loadSharedContent(completion: @escaping () -> Void) {
+        guard let item = extensionContext?.inputItems.first as? NSExtensionItem,
+              let providers = item.attachments
+        else {
+            completion()
+            return
+        }
+
+        let group = DispatchGroup()
+        for provider in providers {
+            if provider.hasItemConformingToTypeIdentifier(UTType.url.identifier) {
+                group.enter()
+                provider.loadItem(forTypeIdentifier: UTType.url.identifier, options: nil) { item, _ in
+                    if let url = item as? URL {
+                        self.sharedURL = url.absoluteString
+                        if self.sharedText.isEmpty { self.sharedText = url.absoluteString }
+                    }
+                    group.leave()
+                }
+            } else if provider.hasItemConformingToTypeIdentifier(UTType.plainText.identifier) {
+                group.enter()
+                provider.loadItem(forTypeIdentifier: UTType.plainText.identifier, options: nil) { item, _ in
+                    if let text = item as? String { self.sharedText = text }
+                    group.leave()
+                }
+            }
+        }
+        group.notify(queue: .main, execute: completion)
+    }
+
+    private func presentEditor() {
+        let host = UIHostingController(rootView: ShareEditorView(
+            text: sharedText,
+            sourceURL: sharedURL,
+            onSave: { [weak self] cleanedText in
+                self?.saveAndClose(text: cleanedText)
+            },
+            onCancel: { [weak self] in
+                self?.cancel()
+            }
+        ))
+        host.modalPresentationStyle = .formSheet
+        present(host, animated: true)
+    }
+
+    private func saveAndClose(text: String) {
+        let share = PendingShare(text: text, sourceURL: sharedURL)
+        PendingShareStore.append(share)
+        dismiss(animated: true) { [weak self] in
+            self?.extensionContext?.completeRequest(returningItems: nil)
+        }
+    }
+
+    private func cancel() {
+        dismiss(animated: true) { [weak self] in
+            self?.extensionContext?.cancelRequest(withError: NSError(domain: "ev.mana.cards.share", code: 0))
+        }
+    }
+}