Adding vibe mana curve

Chrono/Shared/Pages/DeckDetail.razor

@@ -38,6 +38,22 @@
                         <small class="text-danger ms-2 d-block d-md-inline">@deck.ValidationMessage</small>
                     }
                 </div>
+
+                @{
+                    var distribution = GetManaDistribution();
+                    var maxCount = distribution.Max(x => x.Count);
+                }
+                <div class="mana-curve">
+                    @foreach (var entry in distribution)
+                    {
+                        var height = maxCount > 0 ? (entry.Count * 100 / maxCount) : 0;
+                        <div class="mana-bar-container">
+                            <div class="mana-bar-label">@entry.Count</div>
+                            <div class="mana-bar" style="height: @($"{Math.Max(height, 5)}%")"></div>
+                            <div class="mana-cost">@(entry.Cost >= 10 ? "10+" : entry.Cost.ToString())</div>
+                        </div>
+                    }
+                </div>
             </header>
 
             @if (deck.Keycards.Count > 0)
@@ -274,6 +290,26 @@
         selectedCard = null;
     }
 
+    private List<(int Cost, int Count)> GetManaDistribution()
+    {
+        if (deck == null) return [];
+        var counts = new Dictionary<int, int>();
+        for (int i = 0; i <= 10; i++) counts[i] = 0;
+
+        foreach (var cardName in deck.Cards)
+        {
+            var card = LookupCard(cardName);
+            if (card?.Cost != null)
+            {
+                var cost = card.Cost.Value;
+                if (cost >= 10) cost = 10;
+                counts[cost]++;
+            }
+        }
+
+        return counts.OrderBy(x => x.Key).Select(x => (x.Key, x.Value)).ToList();
+    }
+
     private RenderFragment RenderDescription(string description)
     {
         return builder =>

Chrono/Shared/Pages/DeckDetail.razor.css

@@ -59,7 +59,51 @@
 .deck-card-count {
     font-size: 0.85rem;
     color: var(--text-muted);
-    margin: 0;
+    margin: 0 0 1.5rem;
+}
+
+.mana-curve {
+    display: flex;
+    align-items: flex-end;
+    gap: 0.5rem;
+    height: 80px;
+    margin-top: 1rem;
+    padding: 0 0.5rem;
+}
+
+.mana-bar-container {
+    flex: 1;
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+    height: 100%;
+    justify-content: flex-end;
+}
+
+.mana-bar-label {
+    font-size: 0.7rem;
+    color: var(--text-muted);
+    margin-bottom: 0.2rem;
+}
+
+.mana-bar {
+    width: 100%;
+    background: var(--accent);
+    border-radius: 4px 4px 0 0;
+    min-height: 4px;
+    transition: height 0.3s ease;
+}
+
+.mana-cost {
+    font-size: 0.75rem;
+    font-weight: 600;
+    color: var(--text-secondary);
+    margin-top: 0.4rem;
+    background: var(--bg-elevated);
+    width: 100%;
+    text-align: center;
+    border-radius: 4px;
+    padding: 0.1rem 0;
 }
 
 .deck-section {