Stop meta box drops when all unlocks obtained, add next-step hints

- BoxEngine: treat meta box chain items as "already obtained" when
  the entire meta unlock sequence is complete, preventing useless
  box_meta_mastery drops that only contain more boxes.
- Add progression hints under completion tracker showing lore fragment
  count, adventure completion count, and a teaser for the final adventure.

content/strings/en.json

@@ -43,6 +43,9 @@
   "loot.category": "Category",
   "ui.feature_unlocked": "NEW FEATURE UNLOCKED: {0}",
   "ui.completion": "Completion: {0}%",
+  "hint.lore": "Lore Fragments: {0}/{1}",
+  "hint.adventures": "Adventures completed: {0}/{1}",
+  "hint.destiny": "Complete all adventures to unlock the final adventure…",
   "prompt.what_do": "What do you do?",
   "prompt.invalid_choice": "Please enter a number between 1 and {0}.",
 

content/strings/fr.json

@@ -43,6 +43,9 @@
   "loot.category": "Catégorie",
   "ui.feature_unlocked": "NOUVELLE FONCTIONNALITÉ : {0}",
   "ui.completion": "Complétion : {0}%",
+  "hint.lore": "Fragments de Lore : {0}/{1}",
+  "hint.adventures": "Aventures terminées : {0}/{1}",
+  "hint.destiny": "Termine toutes les aventures pour débloquer l'aventure finale…",
   "prompt.what_do": "Que fais-tu ?",
   "prompt.invalid_choice": "Entre un nombre entre 1 et {0}.",
 

src/OpenTheBox/Program.cs

@@ -1013,6 +1013,27 @@ public static class Program
                      + _state.VisibleStats.Count;
 
         _renderContext.CompletionPercent = total > 0 ? (int)(unlocked * 100.0 / total) : 0;
+
+        // Build next-step hints
+        var hints = new List<string>();
+
+        // Lore fragments
+        var totalLore = _registry.Items.Values.Count(i => i.Category == ItemCategory.LoreFragment);
+        var ownedLore = _state.Inventory.Count(i =>
+            _registry.GetItem(i.DefinitionId)?.Category == ItemCategory.LoreFragment);
+        if (ownedLore < totalLore)
+            hints.Add(_loc.Get("hint.lore", ownedLore, totalLore));
+
+        // Adventures completed
+        var completedAdv = _state.CompletedAdventures.Count;
+        if (completedAdv < totalAdventures)
+            hints.Add(_loc.Get("hint.adventures", completedAdv, totalAdventures));
+
+        // Destiny adventure not yet unlocked — show condition
+        if (!_state.UnlockedAdventures.Contains(AdventureTheme.Destiny))
+            hints.Add(_loc.Get("hint.destiny"));
+
+        _renderContext.NextHints = hints;
     }
 
     private static string GetUIFeatureLocKey(UIFeature feature) => feature switch

src/OpenTheBox/Rendering/RenderContext.cs

@@ -40,6 +40,9 @@ public sealed class RenderContext
     /// <summary>Completion percentage (0-100), updated before each render call.</summary>
     public int CompletionPercent { get; set; }
 
+    /// <summary>Short hints about what to do next, displayed under completion tracker.</summary>
+    public List<string> NextHints { get; set; } = [];
+
     /// <summary>
     /// Builds a <see cref="RenderContext"/> that mirrors the features already unlocked in a
     /// <see cref="GameState"/>.

src/OpenTheBox/Rendering/SpectreRenderer.cs

@@ -497,7 +497,11 @@ public sealed class SpectreRenderer : IRenderer
             rightItems.Add(CraftingPanel.Render(state, _registry, _loc));
 
         if (context.HasCompletionTracker)
+        {
             rightItems.Add(new Markup($"[bold cyan]{Markup.Escape(_loc.Get("ui.completion", context.CompletionPercent))}[/]"));
+            foreach (var hint in context.NextHints)
+                rightItems.Add(new Markup($"  [dim]{Markup.Escape(hint)}[/]"));
+        }
 
         IRenderable rightPanel = rightItems.Count > 0
             ? new Rows(rightItems)
@@ -545,6 +549,10 @@ public sealed class SpectreRenderer : IRenderer
             AnsiConsole.Write(CraftingPanel.Render(state, _registry, _loc));
 
         if (context.HasCompletionTracker)
+        {
             AnsiConsole.Write(new Rule($"[bold cyan]{Markup.Escape(_loc.Get("ui.completion", context.CompletionPercent))}[/]").RuleStyle("cyan"));
+            foreach (var hint in context.NextHints)
+                AnsiConsole.MarkupLine($"  [dim]{Markup.Escape(hint)}[/]");
+        }
     }
 }

src/OpenTheBox/Simulation/BoxEngine.cs

@@ -221,6 +221,10 @@ public class BoxEngine(ContentRegistry registry)
         if (itemDef.MetaUnlock.HasValue && state.UnlockedUIFeatures.Contains(itemDef.MetaUnlock.Value))
             return true;
 
+        // Meta box chain: treat as obtained when the entire chain is exhausted
+        if (Array.IndexOf(MetaBoxChain, itemDefId) >= 0 && MetaEngine.GetNextMetaItemId(state, registry) is null)
+            return true;
+
         // Resource visibility already unlocked (only Meta items, not consumables)
         if (itemDef.ResourceType.HasValue && itemDef.Category == ItemCategory.Meta
             && state.VisibleResources.Contains(itemDef.ResourceType.Value))