chore(lint): SwiftLint-Config + 0-Warnings-Pass + Swift-6-Concurrency-Fixes

Bringt cards-native auf 0 SwiftLint-Violations bei 75 Files. Build-Status
unverändert grün (xcodebuild iOS Debug).

.swiftlint.yml
- identifier_name excludes erweitert um math/index-Konventionen
  (i, j, n, m, x, y, w, h, r, g, b, a, c, d, s, f, p, q, t, l) —
  in algorithmischem Code klarer als verbose
- opening_brace disabled — kollidiert mit SwiftFormats
  wrapMultilineStatementBraces (SwiftFormat ist im Pre-Commit-Hook
  und gewinnt)

Code-Modernisierungen (real, nicht nur Annotations)
- Cloze.swift: regex-Tuple bekommt `swiftlint:disable large_tuple`-
  Region — Regex-Output-Type ist Builder-bedingt nicht reduzierbar
- Media.swift: `data(using: .utf8)` → `Data(s.utf8)` (non-failable),
  `String(data:as:)` → `String(bytes:encoding:)`
- CardsTheme.swift: HSL-Wert-Typ statt anonymes 3-Tupel —
  konkretere Call-Sites, kein `large_tuple`-Warning mehr
- MediaCache.swift: `CacheEntry`-Struct statt 3-Tupel im Prune-Pfad
- GradeQueue / MediaCache / StudySession / MarketplaceStore: OSLog-
  Interpolations auf lokale Variablen ziehen — fixt Swift-6-Strict-
  Concurrency-Fail bei Actor-isolated-Property-Zugriff aus
  @Sendable-Autoclosure
- DeckMutations.swift, MarketplaceModeration.swift: verschachtelte
  VersionInfo-Sub-Types auf Top-Level (`PullUpdateVersion`,
  `OwnedMarketplaceVersion`) — fixt `nesting`-Warning
- Tests/UnitTests/*.swift: alle `""".data(using: .utf8)!` migriert auf
  `Data("""…""".utf8)`; force-cast `as!` in MutationEncodingTests
  durch guard-let + throw ersetzt

Pragmatische Disables (mit Doc-Comment-Begründung)
- DeckEditorView / MarketplacePublishView / DeckDetailView /
  PublicDeckView / DeckListView / CardEditorView / CardsAPI:
  `swiftlint:disable type_body_length` (+ teilweise file_length)
  als Region-Disable mit `enable` nach dem Struct. Begründung im
  Doc-Comment: Multi-State-Maschinen mit shared Toolbar + Sheets;
  Aufspalten würde nur @Binding-Plumbing produzieren

Auto-Format-Aufräumung
- Redundante `Sendable`-Conformance entfernt (Swift 6 leitet das
  bei Wert-Typen mit Sendable-Mitgliedern automatisch ab)
- EnvironmentValues nutzt jetzt @Entry-Macro statt manueller
  EnvironmentKey-Boilerplate
- Brace-Reformatting + Import-Sortierung auf allen 75 Files

Ergebnis: 80 Warnings + 3 Errors → 0 / 0.

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

Sources/Features/Study/CardRenderer.swift

@@ -38,7 +38,6 @@ struct CardRenderer: View {
         .frame(maxWidth: .infinity, maxHeight: .infinity)
     }
 
-    @ViewBuilder
     private func basicView(front frontKey: String, back backKey: String) -> some View {
         VStack(spacing: 16) {
             text(card.fields[frontKey] ?? "")
@@ -131,7 +130,6 @@ struct CardRenderer: View {
         }
     }
 
-    @ViewBuilder
     private var placeholderView: some View {
         VStack(spacing: 8) {
             Image(systemName: "questionmark.square.dashed")

Sources/Features/Study/MultipleChoiceCardView.swift

@@ -15,10 +15,10 @@ struct MultipleChoiceCardView: View {
     @State private var selected: String?
     @State private var phase: LoadPhase = .loading
 
-    enum LoadPhase: Sendable {
+    enum LoadPhase {
         case loading
         case ready
-        case tooFew   // < 1 Distractor → manueller Modus
+        case tooFew // < 1 Distractor → manueller Modus
         case failed
     }
 
@@ -82,7 +82,10 @@ struct MultipleChoiceCardView: View {
             }
             .padding(.vertical, 12)
             .padding(.horizontal, 14)
-            .background(background(isCorrect: isCorrect, isSelected: isSelected), in: RoundedRectangle(cornerRadius: 10, style: .continuous))
+            .background(
+                background(isCorrect: isCorrect, isSelected: isSelected),
+                in: RoundedRectangle(cornerRadius: 10, style: .continuous)
+            )
             .overlay(
                 RoundedRectangle(cornerRadius: 10, style: .continuous)
                     .stroke(border(isCorrect: isCorrect, isSelected: isSelected), lineWidth: 1)

Sources/Features/Study/RatingBar.swift

@@ -1,7 +1,7 @@
 import SwiftUI
 
 #if canImport(UIKit)
-import UIKit
+    import UIKit
 #endif
 
 /// Vier Rating-Buttons mit emphasis auf "Good" (full-width primary).
@@ -85,9 +85,9 @@ struct RatingBar: View {
 
     private func triggerHaptic(for rating: Rating) {
         #if canImport(UIKit)
-        let style: UIImpactFeedbackGenerator.FeedbackStyle =
-            rating == .easy ? .heavy : .medium
-        UIImpactFeedbackGenerator(style: style).impactOccurred()
+            let style: UIImpactFeedbackGenerator.FeedbackStyle =
+                rating == .easy ? .heavy : .medium
+            UIImpactFeedbackGenerator(style: style).impactOccurred()
         #endif
     }
 }

Sources/Features/Study/StudySession.swift

@@ -8,7 +8,7 @@ import SwiftData
 @MainActor
 @Observable
 final class StudySession {
-    enum Phase: Sendable {
+    enum Phase {
         case loading
         case studying
         case finished
@@ -55,7 +55,9 @@ final class StudySession {
             } else {
                 phase = .studying
             }
-            Log.study.info("Session start — \(self.queue.count, privacy: .public) due in deck \(self.deckId, privacy: .public)")
+            let count = queue.count
+            let id = deckId
+            Log.study.info("Session start — \(count, privacy: .public) due in deck \(id, privacy: .public)")
         } catch {
             let msg = (error as? LocalizedError)?.errorDescription ?? String(describing: error)
             phase = .failed(msg)
@@ -86,7 +88,8 @@ final class StudySession {
         isFlipped = false
         if currentIndex >= queue.count {
             phase = .finished
-            Log.study.info("Session finished — graded \(self.totalGraded, privacy: .public)")
+            let count = totalGraded
+            Log.study.info("Session finished — graded \(count, privacy: .public)")
         }
     }
 }

Sources/Features/Study/TypingCardView.swift

@@ -19,8 +19,13 @@ struct TypingCardView: View {
     @State private var result: TypingMatch?
     @FocusState private var inputFocused: Bool
 
-    private var answer: String { card.fields["answer"] ?? "" }
-    private var aliases: String? { card.fields["aliases"] }
+    private var answer: String {
+        card.fields["answer"] ?? ""
+    }
+
+    private var aliases: String? {
+        card.fields["aliases"]
+    }
 
     var body: some View {
         VStack(alignment: .leading, spacing: 16) {
@@ -67,9 +72,9 @@ struct TypingCardView: View {
                         .stroke(inputFocused ? CardsTheme.primary : CardsTheme.border, lineWidth: 1)
                 )
                 .autocorrectionDisabled()
-                #if os(iOS)
+            #if os(iOS)
                 .textInputAutocapitalization(.never)
-                #endif
+            #endif
                 .onSubmit { submit() }
 
             Button {
@@ -140,9 +145,9 @@ struct TypingCardView: View {
 
     private func triggerHaptic() {
         #if canImport(UIKit)
-        let style: UIImpactFeedbackGenerator.FeedbackStyle =
-            result == .correct ? .heavy : .light
-        UIImpactFeedbackGenerator(style: style).impactOccurred()
+            let style: UIImpactFeedbackGenerator.FeedbackStyle =
+                result == .correct ? .heavy : .light
+            UIImpactFeedbackGenerator(style: style).impactOccurred()
         #endif
     }
 
@@ -183,5 +188,5 @@ struct TypingCardView: View {
 }
 
 #if canImport(UIKit)
-import UIKit
+    import UIKit
 #endif