feat(decks): Tile-Redesign — Tap=Study, Edit-Icon, Explore-Konsistenz

User-Feedback umgesetzt:
- Tap auf Deck-Tile öffnet jetzt direkt den Study-Mode für dieses
  Deck (statt Deck-Detail). DeckRoute-Enum mit .study/.detail-Cases
  + programmatic NavigationPath.
- Edit-Icon (Pencil) unten rechts auf der Tile in Muted-Circle-Badge;
  Tap führt in den Deck-Detail-View (Browse Cards + Bearbeiten).
- Kategorie-Icon oben rechts jetzt in primary-Farbe (war muted) +
  größer (.title2 statt .title3) — visuell prominenter.
- Inbox-Banner ist jetzt als Button → Study-Mode mit dem ersten
  Inbox-Deck.

ExploreView/PublicDeckCard:
- Selbes Tile-Layout wie DeckStackTile (5:7 Aspect-Ratio, CardSurface,
  Kategorie-Icon oben rechts, Footer mit Counts + Owner).
- Featured-Star-Badge oben links statt rechts (damit Kategorie-Icon
  konsistent rechts bleibt).
- Star-Count als ausgefüllter Stern in warning-Farbe.
- Owner-Name unter den Counts, mit verified-Seal wenn vorhanden.

Build 10 → 11. 43 Tests grün.

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

Sources/Features/Marketplace/ExploreView.swift

@@ -124,57 +124,91 @@ enum MarketplaceRoute: Hashable {
 }
 
 /// Public-Deck-Karten-Tile in Featured/Trending-Carousels und Browse-Grid.
+/// Selbes Tile-Layout wie DeckStackTile (5:7 Aspect-Ratio,
+/// CardSurface, Kategorie-Icon oben rechts), aber für PublicDeckEntry-
+/// Daten. Star-Count statt Edit-Button unten rechts.
 struct PublicDeckCard: View {
     let entry: PublicDeckEntry
 
     var body: some View {
-        VStack(alignment: .leading, spacing: 8) {
-            HStack {
-                Text(entry.title)
-                    .font(.headline)
-                    .foregroundStyle(CardsTheme.foreground)
-                    .lineLimit(2)
-                Spacer()
+        ZStack {
+            CardSurface(size: .md, elevation: .standard, colorAccentHex: nil) {
+                cardContent
+            }
+        }
+        .aspectRatio(5.0 / 7.0, contentMode: .fit)
+        .frame(maxWidth: 280)
+    }
+
+    private var cardContent: some View {
+        VStack(alignment: .leading, spacing: 6) {
+            HStack(alignment: .top) {
                 if entry.isFeatured {
                     Image(systemName: "star.fill")
                         .font(.caption)
                         .foregroundStyle(CardsTheme.warning)
                 }
+                Spacer()
+                Image(systemName: categorySymbol)
+                    .font(.title2)
+                    .foregroundStyle(CardsTheme.primary.opacity(0.85))
             }
-            if let description = entry.description, !description.isEmpty {
-                Text(description)
-                    .font(.caption)
-                    .foregroundStyle(CardsTheme.mutedForeground)
-                    .lineLimit(2)
-            }
-            HStack(spacing: 12) {
-                Label("\(entry.cardCount)", systemImage: "rectangle.stack")
-                Label("\(entry.starCount)", systemImage: "star")
-                if entry.isPaid {
-                    Label("\(entry.priceCredits) Credits", systemImage: "creditcard")
-                        .foregroundStyle(CardsTheme.primary)
+
+            Spacer(minLength: 0)
+
+            VStack(alignment: .leading, spacing: 6) {
+                Text(entry.title)
+                    .font(.system(size: 17, weight: .semibold))
+                    .foregroundStyle(CardsTheme.foreground)
+                    .lineLimit(3)
+
+                if let description = entry.description, !description.isEmpty {
+                    Text(description)
+                        .font(.caption)
+                        .foregroundStyle(CardsTheme.mutedForeground)
+                        .lineLimit(2)
                 }
             }
-            .font(.caption2)
-            .foregroundStyle(CardsTheme.mutedForeground)
 
-            HStack(spacing: 4) {
-                Text(entry.owner.displayName)
-                    .font(.caption2)
-                    .foregroundStyle(CardsTheme.mutedForeground)
-                if entry.owner.verifiedMana {
-                    Image(systemName: "checkmark.seal.fill")
+            Spacer(minLength: 0)
+
+            VStack(alignment: .leading, spacing: 6) {
+                HStack(spacing: 8) {
+                    Label("\(entry.cardCount)", systemImage: "rectangle.stack")
                         .font(.caption2)
-                        .foregroundStyle(CardsTheme.primary)
+                        .foregroundStyle(CardsTheme.mutedForeground)
+                    Label("\(entry.starCount)", systemImage: "star.fill")
+                        .font(.caption2)
+                        .foregroundStyle(CardsTheme.warning)
+                    if entry.isPaid {
+                        Label("\(entry.priceCredits)", systemImage: "creditcard")
+                            .font(.caption2.weight(.semibold))
+                            .foregroundStyle(CardsTheme.primary)
+                    }
+                    Spacer()
+                }
+                HStack(spacing: 4) {
+                    Text(entry.owner.displayName)
+                        .font(.caption2)
+                        .foregroundStyle(CardsTheme.mutedForeground)
+                        .lineLimit(1)
+                    if entry.owner.verifiedMana {
+                        Image(systemName: "checkmark.seal.fill")
+                            .font(.caption2)
+                            .foregroundStyle(CardsTheme.primary)
+                    }
                 }
             }
         }
-        .padding(12)
-        .frame(width: 260, alignment: .leading)
-        .background(CardsTheme.surface, in: RoundedRectangle(cornerRadius: 10))
-        .overlay(
-            RoundedRectangle(cornerRadius: 10)
-                .stroke(CardsTheme.border, lineWidth: 1)
-        )
+        .frame(maxWidth: .infinity, maxHeight: .infinity, alignment: .topLeading)
+    }
+
+    private var categorySymbol: String {
+        guard let category = entry.category,
+              let parsed = DeckCategory(rawValue: category)
+        else {
+            return "rectangle.stack"
+        }
+        return parsed.systemImageName
     }
 }