fix: User-facing Strings Cards → Cardecky komplett, Build 3

User-facing Rebrand:
- LoginView Heading (war schon in v0.8.5)
- NotificationManager.title (war schon in v0.8.5)
- ShareEditorView Footer-Text: "...in der Cards-App" → "...in der Cardecky-App"
- StudyAppIntents Description: "Öffnet Cards" → "Öffnet Cardecky"
- Localizable.xcstrings: "Cards" key → "Cardecky"
- NSPhotoLibraryUsageDescription: "Cards greift..." → "Cardecky greift..."
- Log.app.info("Cards starting") → "Cardecky starting"
- MARKETING_COPY.md: alle "Cards"-Treffer in DE + EN auf Cardecky
- RELEASE_CHECKLIST: App-Name "Cards" → "Cardecky"

Build-Nummer 2 → 3 (Apple lehnt doppelte Build-Nummern ab, Code-
Hash hat sich geändert).

Code-Identifier bleiben: CardsAPI, CardsTheme, CardsNativeApp,
CardsWidgetExtension, CardsShareExtension — interne Symbol-Namen,
nicht user-facing.

Archive verifiziert: CFBundleDisplayName=Cardecky, Build=3.

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

Sources/App/CardsNativeApp.swift

@@ -18,7 +18,7 @@ struct CardsNativeApp: App {
         auth.bootstrap()
         _auth = State(initialValue: auth)
         mediaCache = MediaCache(api: CardsAPI(auth: auth))
-        Log.app.info("Cards starting — auth status: \(String(describing: auth.status), privacy: .public)")
+        Log.app.info("Cardecky starting — auth status: \(String(describing: auth.status), privacy: .public)")
     }
 
     var body: some Scene {

Sources/Core/Intents/StudyAppIntents.swift

@@ -7,7 +7,7 @@ import SwiftUI
 struct StudyCardsIntent: AppIntent {
     static let title: LocalizedStringResource = "Karten lernen"
     static let description = IntentDescription(
-        "Öffnet Cards und zeigt deine Decks mit fälligen Karten.",
+        "Öffnet Cardecky und zeigt deine Decks mit fälligen Karten.",
         categoryName: "Lernen"
     )
     static let openAppWhenRun: Bool = true

Sources/Resources/Localizable.xcstrings

@@ -31,7 +31,7 @@
     "Card-Type »%@« kommt in einer späteren Phase" : {
 
     },
-    "Cards" : {
+    "Cardecky" : {
 
     },
     "Changelog" : {