Merge remote-tracking branch 'origin/main' into work_branch

# Conflicts:
#	Assets/Darkmatter/Code/Features/ColorbookFlow/Features.Colorbook.asmdef
#	Assets/Darkmatter/Code/Features/ColorbookFlow/System/ColorbookFlowController.cs

Assets/Darkmatter/Code/Core/Contracts/Features/Coloring/IColoringController.cs

@@ -0,0 +1,17 @@
+using System.Collections.Generic;
+using System.Threading;
+using Cysharp.Threading.Tasks;
+using Darkmatter.Core.Contracts.Features.DrawingCatalog;
+using UnityEngine;
+
+namespace Darkmatter.Core.Contracts.Features.Coloring;
+
+public interface IColoringController
+{
+    UniTask InitializeRegionsAsync(IDrawingTemplate template, IReadOnlyDictionary<string, Color> savedColors,
+        CancellationToken ct);
+
+    void PaintRegion(string regionId, Color color);
+    IReadOnlyDictionary<string, Color> GetCurrentColors();
+    void Clear();
+}

Assets/Darkmatter/Code/Core/Contracts/Features/Coloring/IColoringController.cs.meta

@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: b5ba5a7108234751ac286a57795fac06
+timeCreated: 1779971202

Assets/Darkmatter/Code/Core/Contracts/Features/DrawingCatalog/IDrawingTemplate.cs

@@ -10,8 +10,10 @@ namespace Darkmatter.Core.Contracts.Features.DrawingCatalog
         string Id { get; }
         string DisplayName { get; }
         Sprite DefaultThumbnail { get; }
-        GameObject Prefab { get; }
+        GameObject DrawingPrefab { get; }
+        GameObject ColoringPrefab { get; }
         IReadOnlyList<ShapeSO> Pieces { get; }
         IReadOnlyList<ColorRegionDTO> Regions { get; }
+        string ColorPaletteId { get; }
     }
 }

Assets/Darkmatter/Code/Core/Contracts/Features/GameplayFlow/IGameplayFlowController.cs

@@ -0,0 +1,12 @@
+using Cysharp.Threading.Tasks;
+
+namespace Darkmatter.Core.Contracts.Features.GameplayFlow
+{
+    public interface IGameplayFlowController
+    {
+        UniTask BackAsync();
+        UniTask SaveAsync();
+        UniTask NextAsync();
+        void OnApplicationPaused();
+    }
+}

Assets/Darkmatter/Code/Core/Contracts/Features/GameplayFlow/IGameplayFlowController.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: fee5907f5643d492ab8ba177f84c30f6

Assets/Darkmatter/Code/Core/Contracts/Features/GameplayFlow/IGameplaySceneRefs.cs

@@ -5,9 +5,4 @@ namespace Darkmatter.Core.Contracts.Features.GameplayFlow;
 public interface IGameplaySceneRefs
 {
     RectTransform PaperRoot { get; }
-    RectTransform SlotsParent { get; }
-    RectTransform PiecesParent { get; }
-    RectTransform RegionsParent { get; }
-    RectTransform HudRoot { get; }
-    RectTransform TrayPanel { get; }
 }

Assets/Darkmatter/Code/Core/Contracts/Features/History/IUndoStack.cs

@@ -7,9 +7,11 @@ namespace Darkmatter.Core.Contracts.Features.History
         event Action OnStackChanged;
         bool CanUndo { get; }
         bool CanRedo { get; }
-        void Push(ICommand cmd); // executes + appends
+        void Push(ICommand cmd); 
+        void Append(ICommand cmd); 
         void Undo();
         void Redo();
-        void Clear();
+        void Clear(); // reverts every command via Undo, then drops (user-facing "wipe" semantics)
+        void Drop();  // drops the list without reverting (controller cleanup — avoids touching destroyed views)
     }
 }

Assets/Darkmatter/Code/Core/Contracts/Features/Progression/IProgressionSystem.cs

@@ -12,6 +12,9 @@ namespace Darkmatter.Core.Contracts.Features.Progression
         IReadOnlyCollection<string> CompletedTemplateIds { get; }
         void MarkCompleted(string templateId);
 
+        string LastOpenedTemplateId { get; }
+        UniTask SetLastOpenedAsync(string templateId);
+
         DrawingProgress? GetProgress(string templateId);
         UniTask SaveProgressAsync(DrawingProgress progress);
         UniTask SaveProgressAsync(DrawingProgress progress, byte[] thumbnailPng);

Assets/Darkmatter/Code/Core/Data/Dynamic/Features/Coloring/ColorRegionDTO.cs

@@ -1,18 +1,19 @@
 using UnityEngine;
+using UnityEngine.UI;
 
 namespace Darkmatter.Core.Data.Dynamic.Features.Coloring
 {
     public readonly struct ColorRegionDTO
     {
-        public string RegionId { get; }
+        public string Id { get; }
-        public Sprite Sprite { get; }
+        public Image Image { get; }
         public Vector2 AnchoredPosition { get; }
         public Color InitialColor { get; }
 
-        public ColorRegionDTO(string regionId, Sprite sprite, Vector2 anchoredPosition, Color initialColor)
+        public ColorRegionDTO(string id, Image image, Vector2 anchoredPosition, Color initialColor)
         {
-            RegionId = regionId;
+            Id = id;
-            Sprite = sprite;
+            Image = image;
             AnchoredPosition = anchoredPosition;
             InitialColor = initialColor;
         }

Assets/Darkmatter/Code/Core/Data/Dynamic/Features/Progression/ProgressionRootDto.cs

@@ -7,5 +7,6 @@ namespace Darkmatter.Core.Data.Dynamic.Features.Progression
     public struct ProgressionRootDto
     {
         public List<DrawingProgress> records;
+        public string lastOpenedTemplateId;
     }
 }

Assets/Darkmatter/Code/Core/Data/Signals/Features/ShapeBuilder/ShapeBuilderStartedSignal.cs

@@ -0,0 +1,4 @@
+namespace Darkmatter.Core.Data.Signals.Features.ShapeBuilder
+{
+    public record struct ShapeBuilderStartedSignal(string TemplateId);
+}

Assets/Darkmatter/Code/Core/Data/Signals/Features/ShapeBuilder/ShapeBuilderStartedSignal.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 40f2733e19ad34fe5ba5d63aa2e9a39b

Assets/Darkmatter/Code/Core/Data/Static/Features/DrawingTemplate/DrawingTemplateSO.cs

@@ -12,8 +12,10 @@ namespace Darkmatter.Core.Data.Static.Features.DrawingTemplate
         [field: SerializeField] public string Id { get; private set; }
         [field: SerializeField] public string DisplayName { get; private set; }
         [field: SerializeField] public Sprite DefaultThumbnail { get; private set; }
-        [field: SerializeField] public GameObject Prefab { get; private set; }
+        [field: SerializeField] public GameObject DrawingPrefab { get; private set; }
+        [field: SerializeField] public GameObject ColoringPrefab { get; private set; }
         [field: SerializeField] public IReadOnlyList<ShapeSO> Pieces { get; private set; }
         [field: SerializeField] public IReadOnlyList<ColorRegionDTO> Regions { get; private set; }
+        [field: SerializeField] public string ColorPaletteId { get; private set; } = "defaultPalette";
     }
 }

Assets/Darkmatter/Code/Core/Data/Static/Features/ShapeBuilder/ShapeBuilderConfig.cs

@@ -8,7 +8,6 @@ namespace Darkmatter.Core.Data.Static.Features.ShapeBuilder
     {
         [Header("Radii (canvas units; reference resolution 2048x2048)")]
         [SerializeField] private float snapRadius          = 100f;
-        [SerializeField] private float snapGraceMultiplier = 1.5f;
         [SerializeField] private float previewRadius       = 200f;
 
         [Header("Tween durations (seconds)")]

Assets/Darkmatter/Code/Core/Enums/Services/Audio/SfxId.cs

@@ -6,5 +6,6 @@ namespace Darkmatter.Core.Enums.Services.Audio
         ShapeHover   = 100,
         ShapeSnap    = 101,
         ShapeReturn  = 102,
+        UiTap        = 200,
     }
 }

Assets/Darkmatter/Code/Features/ColorbookFlow/Features.Colorbook.asmdef

@@ -4,9 +4,11 @@
     "references": [
         "GUID:6a0a834eb41764f12ba55c3fb04a40cb",
         "GUID:c1c03c0e5b2f4412b9f2be1c20d6a9b1",
+        "GUID:c176ee863a5e74e88a6517f9f102cf92",
+        "GUID:b4c9f7fbf1e144933a1797dc208ece5f",
         "GUID:b0214a6008ed146ff8f122a6a9c2f6cc",
         "GUID:f51ebe6a0ceec4240a699833d6309b23",
-        "GUID:b4c9f7fbf1e144933a1797dc208ece5f"
+        "GUID:80ecb87cae9c44d19824e70ea7229748"
     ],
     "includePlatforms": [],
     "excludePlatforms": [],

Assets/Darkmatter/Code/Features/ColorbookFlow/System/ColorbookFlowController.cs

@@ -5,7 +5,9 @@ using Cysharp.Threading.Tasks;
 using Darkmatter.Core;
 using Darkmatter.Core.Contracts.Features.DrawingCatalog;
 using Darkmatter.Core.Contracts.Features.Loading;
+using Darkmatter.Core.Contracts.Features.Progression;
 using Darkmatter.Core.Contracts.Services.Scenes;
+using Darkmatter.Core.Data.Signals.Features.Drawing;
 using Darkmatter.Core.Enums.Services.Scenes;
 using Darkmatter.Libs.Observer;
 using VContainer.Unity;
@@ -16,17 +18,24 @@ public class ColorbookFlowController : IAsyncStartable, IDisposable
 {
     private readonly IDrawingCatalogController _drawingCatalog;
     private readonly ILoadingScreen _loadingScreen;
-    private readonly IEventBus _eventBus;
+    private readonly IProgressionSystem _progression;
-    private readonly ISceneService _sceneService;
+    private readonly ISceneService _scenes;
+    private readonly IEventBus _bus;
 
-    private IDisposable _returnToMainMenuSubscription;
+    private IDisposable _selectedSub;
 
-    public ColorbookFlowController(IDrawingCatalogController drawingCatalog, ILoadingScreen loadingScreen, IEventBus eventBus, ISceneService sceneService)
+    public ColorbookFlowController(
+        IDrawingCatalogController drawingCatalog,
+        ILoadingScreen loadingScreen,
+        IProgressionSystem progression,
+        ISceneService scenes,
+        IEventBus bus)
     {
         _drawingCatalog = drawingCatalog;
         _loadingScreen = loadingScreen;
-        _eventBus = eventBus;
+        _progression = progression;
-        _sceneService = sceneService;
+        _scenes = scenes;
+        _bus = bus;
     }
 
     public async UniTask StartAsync(CancellationToken cancellation = new CancellationToken())
@@ -34,25 +43,23 @@ public class ColorbookFlowController : IAsyncStartable, IDisposable
         _returnToMainMenuSubscription = _eventBus.Subscribe<ReturnToMainMenuSignal>(OnReturnToMainMenu);
         _loadingScreen.SetProgress(1f);
         await _drawingCatalog.InitializeAsync(cancellation);
+        _selectedSub = _bus.Subscribe<DrawingSelectedSignal>(OnDrawingSelected);
         _loadingScreen.Hide();
     }
 
-    private void OnReturnToMainMenu(ReturnToMainMenuSignal signal)
+    private void OnDrawingSelected(DrawingSelectedSignal signal)
     {
-        LoadMainMenuSceneAsync().Forget(UnityEngine.Debug.LogException);
+        HandleSelectionAsync(signal.TemplateId).Forget();
     }
 
-    private async UniTask LoadMainMenuSceneAsync(CancellationToken ct = default)
+    private async UniTaskVoid HandleSelectionAsync(string templateId)
     {
-        _loadingScreen.Show();
+        await _progression.SetLastOpenedAsync(templateId);
-        var progress = new Progress<float>(p => _loadingScreen.SetProgress(p * 0.5f));
+        await _scenes.LoadSceneAsync(GameScene.Gameplay, progress: null, cancellationToken: default);
-        await _sceneService.LoadSceneAsync(nameof(GameScene.MainMenu), progress, ct);
-        var mappedProgress = new Progress<float>(p => _loadingScreen.SetProgress(0.5f + p * 0.25f));
-        await _sceneService.UnloadSceneAsync(nameof(GameScene.Colorbook), mappedProgress, ct);
     }
 
     public void Dispose()
     {
-        _returnToMainMenuSubscription?.Dispose();
+        _selectedSub?.Dispose();
     }
 }

Assets/Darkmatter/Code/Features/Coloring/Commands/ColorRegionCommand.cs

@@ -0,0 +1,22 @@
+using Darkmatter.Core.Contracts.Features.History;
+using Darkmatter.Features.Coloring.UI;
+using UnityEngine;
+
+namespace Darkmatter.Features.Coloring.Commands;
+
+public class ColorRegionCommand : ICommand
+{
+    private readonly ColorRegionView _view;
+    private readonly Color _from;
+    private readonly Color _to;
+
+    public ColorRegionCommand(ColorRegionView view, Color from, Color to)
+    {
+        _view = view;
+        _from = from;
+        _to = to;
+    }
+
+    public void Execute() => _view.SetColor(_to);
+    public void Undo()    => _view.SetColor(_from);
+}

Assets/Darkmatter/Code/Features/Coloring/Commands/ColorRegionCommand.cs.meta

@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: c212dc9aaa7e4445968fee229a715b3b
+timeCreated: 1779972906

Assets/Darkmatter/Code/Features/Coloring/Installers/ColoringFeatureModule.cs

@@ -1,14 +1,28 @@
+using Darkmatter.Core.Contracts.Features.Coloring;
+using Darkmatter.Features.Coloring.Systems;
+using Darkmatter.Features.Coloring.UI;
 using Darkmatter.Libs.Installers;
 using UnityEngine;
 using VContainer;
+using VContainer.Unity;
 
 namespace Darkmatter.Features.Coloring
 {
     public class ColoringFeatureModule : MonoBehaviour, IModule
     {
+        [SerializeField] private ColorPaletteHolderView paletteHolderView;
+
         public void Register(IContainerBuilder builder)
         {
+            if (paletteHolderView != null)
+            {
+                builder.RegisterComponent(paletteHolderView);
+                builder.RegisterEntryPoint<ColorPaletteHolderPresenter>().WithParameter(paletteHolderView);
+            }
 
+            builder.Register<IColorButtonFactory, ColorButtonFactory>(Lifetime.Singleton);
+            builder.Register<ColoringStateRepository>(Lifetime.Singleton);
+            builder.Register<IColoringController, ColoringController>(Lifetime.Singleton);
         }
     }
 }

Assets/Darkmatter/Code/Features/Coloring/Systems.meta

@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: 569e45483f54348a593b6571740cd8a2
+folderAsset: yes
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/Darkmatter/Code/Features/Coloring/Systems/ColorButtonFactory.cs

@@ -0,0 +1,30 @@
+using Darkmatter.Core.Contracts.Services.Audio;
+using Darkmatter.Features.Coloring.UI;
+using UnityEngine;
+
+namespace Darkmatter.Features.Coloring.Systems;
+
+public class ColorButtonFactory : IColorButtonFactory
+{
+    private readonly ColorPaletteHolderView _holder;
+    private readonly ColoringStateRepository _repository;
+    private readonly ISfxPlayer _sfx;
+
+    public ColorButtonFactory(
+        ColorPaletteHolderView holder,
+        ColoringStateRepository repository,
+        ISfxPlayer sfx)
+    {
+        _holder = holder;
+        _repository = repository;
+        _sfx = sfx;
+    }
+
+    public ColorButton Create(GameObject prefab, Color color)
+    {
+        var go = Object.Instantiate(prefab, _holder.SpawnRoot);
+        var btn = go.GetComponent<ColorButton>();
+        btn.Setup(color, _repository, _sfx);
+        return btn;
+    }
+}

Assets/Darkmatter/Code/Features/Coloring/Systems/ColorButtonFactory.cs.meta

@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: 1bba9a928a76471391068acd46c4f684
+timeCreated: 1779970637

Assets/Darkmatter/Code/Features/Coloring/Systems/ColoringController.cs

@@ -0,0 +1,146 @@
+using System;
+using System.Collections.Generic;
+using System.Threading;
+using Cysharp.Threading.Tasks;
+using Darkmatter.Core.Contracts.Features.Coloring;
+using Darkmatter.Core.Contracts.Features.DrawingCatalog;
+using Darkmatter.Core.Contracts.Features.GameplayFlow;
+using Darkmatter.Core.Contracts.Features.History;
+using Darkmatter.Core.Contracts.Services.Assets;
+using Darkmatter.Core.Data.Signals.Features.Coloring;
+using Darkmatter.Core.Data.Static.Features.Coloring;
+using Darkmatter.Features.Coloring.Commands;
+using Darkmatter.Features.Coloring.UI;
+using Darkmatter.Libs.Observer;
+using UnityEngine;
+using ZLinq;
+
+namespace Darkmatter.Features.Coloring.Systems;
+
+public class ColoringController : IColoringController, IDisposable
+{
+    private const string ColorButtonPrefabKey = "colorButton";
+
+    private readonly ColoringStateRepository _repository;
+    private readonly IColorButtonFactory _buttonFactory;
+    private readonly IEventBus _bus;
+    private readonly IAssetProviderService _assetProviderService;
+    private readonly IUndoStack _history;
+    private readonly IGameplaySceneRefs _refs;
+
+    private GameObject _colorInstance;
+    private GameObject _colorButtonPrefab;
+    private readonly List<ColorRegionView> _regions = new();
+    private readonly List<ColorButton> _buttons = new();
+
+    public ColoringController(
+        ColoringStateRepository repository,
+        IColorButtonFactory buttonFactory,
+        IEventBus bus,
+        IAssetProviderService assetProviderService,
+        IUndoStack history,
+        IGameplaySceneRefs refs)
+    {
+        _repository = repository;
+        _buttonFactory = buttonFactory;
+        _bus = bus;
+        _assetProviderService = assetProviderService;
+        _history = history;
+        _refs = refs;
+    }
+
+    public async UniTask InitializeRegionsAsync(IDrawingTemplate template,
+        IReadOnlyDictionary<string, Color> savedColors, CancellationToken ct)
+    {
+        Clear();
+        await TryLoadColorButtonPrefabAsync(ct);
+        ct.ThrowIfCancellationRequested();
+        await TryLoadColorPaletteAsync(template, ct);
+        ct.ThrowIfCancellationRequested();
+        CreateColorButtonInstances();
+        InitializeColorRegions(template, savedColors);
+    }
+
+    public void PaintRegion(string regionId, Color color)
+    {
+        var region = _regions.AsValueEnumerable().FirstOrDefault(r => r.RegionId == regionId);
+        if (region == null) return;
+
+        var from = region.Color;
+        _history.Push(new ColorRegionCommand(region, from, color));
+        _bus.Publish(new ColorAppliedSignal(regionId, color));
+    }
+
+    public IReadOnlyDictionary<string, Color> GetCurrentColors()
+    {
+        var snapshot = new Dictionary<string, Color>(_regions.Count);
+        foreach (var region in _regions)
+            snapshot[region.RegionId] = region.Color;
+        return snapshot;
+    }
+
+    public void Clear()
+    {
+        _history.Drop();
+
+        foreach (var button in _buttons)
+            if (button != null) UnityEngine.Object.Destroy(button.gameObject);
+        _buttons.Clear();
+
+        _regions.Clear();
+
+        if (_colorInstance != null)
+        {
+            UnityEngine.Object.Destroy(_colorInstance);
+            _colorInstance = null;
+        }
+    }
+
+    public void Dispose() => Clear();
+
+    private void InitializeColorRegions(IDrawingTemplate template, IReadOnlyDictionary<string, Color> savedColors)
+    {
+        _colorInstance = UnityEngine.Object.Instantiate(template.ColoringPrefab, _refs.PaperRoot);
+        var views = _colorInstance.GetComponentsInChildren<ColorRegionView>(includeInactive: true);
+
+        foreach (var region in views)
+        {
+            var id = region.RegionId;
+            var authoredColor = region.Color;
+            var resumeColor = savedColors != null && savedColors.TryGetValue(id, out var saved)
+                ? saved
+                : authoredColor;
+
+            if (resumeColor != authoredColor)
+                _history.Append(new ColorRegionCommand(region, authoredColor, resumeColor));
+
+            _regions.Add(region);
+            region.Initialize(resumeColor, () => PaintRegion(id, _repository.SelectedColor));
+        }
+    }
+
+    private async UniTask TryLoadColorButtonPrefabAsync(CancellationToken ct)
+    {
+        if (_colorButtonPrefab != null) return;
+
+        _colorButtonPrefab = await _assetProviderService.LoadAssetAsync<GameObject>(
+            ColorButtonPrefabKey, progress: null, cancellationToken: ct);
+        if (_colorButtonPrefab == null)
+            throw new Exception($"No color button prefab at '{ColorButtonPrefabKey}'");
+    }
+
+    private async UniTask TryLoadColorPaletteAsync(IDrawingTemplate template, CancellationToken ct)
+    {
+        var palette = await _assetProviderService.LoadAssetAsync<ColorPaletteSO>(
+            template.ColorPaletteId, progress: null, cancellationToken: ct);
+        if (palette == null)
+            throw new Exception($"No color palette at '{template.ColorPaletteId}'");
+        _repository.SetPalette(palette);
+    }
+
+    private void CreateColorButtonInstances()
+    {
+        foreach (var color in _repository.SelectedPalette.Colors)
+            _buttons.Add(_buttonFactory.Create(_colorButtonPrefab, color));
+    }
+}

Assets/Darkmatter/Code/Features/Coloring/Systems/ColoringController.cs.meta

@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: 0849f8cc757842278c38ee6f4d61b985
+timeCreated: 1779971175

Assets/Darkmatter/Code/Features/Coloring/Systems/ColoringStateRepository.cs

@@ -0,0 +1,33 @@
+using System;
+using Darkmatter.Core.Contracts.Features.Coloring;
+using UnityEngine;
+
+namespace Darkmatter.Features.Coloring.Systems;
+
+public class ColoringStateRepository
+{
+    public IColorPalette SelectedPalette { get; private set; }
+    public int SelectedIndex { get; private set; }
+    public Color SelectedColor =>
+        SelectedPalette != null && SelectedIndex >= 0 && SelectedIndex < SelectedPalette.Colors.Count
+            ? SelectedPalette.Colors[SelectedIndex]
+            : Color.white;
+
+    public event Action SelectedIndexChanged;
+
+    public void SetPalette(IColorPalette palette)
+    {
+        SelectedPalette = palette;
+        SelectedIndex = 0;
+        SelectedIndexChanged?.Invoke();
+    }
+
+    public void SelectColor(Color color)
+    {
+        if (SelectedPalette == null) return;
+        var idx = SelectedPalette.Colors.IndexOf(color);
+        if (idx < 0) return;
+        SelectedIndex = idx;
+        SelectedIndexChanged?.Invoke();
+    }
+}

Assets/Darkmatter/Code/Features/Coloring/Systems/ColoringStateRepository.cs.meta

@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: a288824e4f554000994bec451c09957c
+timeCreated: 1779970861

Assets/Darkmatter/Code/Features/Coloring/Systems/IColorButtonFactory.cs

@@ -0,0 +1,9 @@
+using Darkmatter.Features.Coloring.UI;
+using UnityEngine;
+
+namespace Darkmatter.Features.Coloring.Systems;
+
+public interface IColorButtonFactory
+{
+    ColorButton Create(GameObject prefab,Color color);
+}

Assets/Darkmatter/Code/Features/Coloring/Systems/IColorButtonFactory.cs.meta

@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: 91b71be7f45a41cbb17492f82a3f0967
+timeCreated: 1779970564

Assets/Darkmatter/Code/Features/Coloring/UI.meta

@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: 416f96737010f40c085ac404743fa8ef
+folderAsset: yes
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/Darkmatter/Code/Features/Coloring/UI/ColorButton.cs

@@ -0,0 +1,54 @@
+using Darkmatter.Core.Contracts.Services.Audio;
+using Darkmatter.Core.Enums.Services.Audio;
+using Darkmatter.Features.Coloring.Systems;
+using UnityEngine;
+using UnityEngine.UI;
+
+namespace Darkmatter.Features.Coloring.UI
+{
+    [RequireComponent(typeof(Button))]
+    public class ColorButton : MonoBehaviour
+    {
+        [SerializeField] private Image swatch;
+        [SerializeField] private GameObject selectedUI;
+        private Button _button;
+        private Color _color;
+        private ColoringStateRepository _repository;
+        private ISfxPlayer _sfx;
+
+        private void Awake()
+        {
+            _button = GetComponent<Button>();
+        }
+
+        public void Setup(Color color, ColoringStateRepository repository, ISfxPlayer sfx)
+        {
+            _color = color;
+            _repository = repository;
+            _sfx = sfx;
+            swatch.color = color;
+
+            _button.onClick.AddListener(OnClick);
+            _repository.SelectedIndexChanged += UpdateSelectedUI;
+            UpdateSelectedUI();
+        }
+
+        private void OnClick()
+        {
+            _sfx.Play(SfxId.UiTap);
+            _repository.SelectColor(_color);
+        }
+
+        private void UpdateSelectedUI()
+        {
+            if (selectedUI != null)
+                selectedUI.SetActive(_repository.SelectedColor == _color);
+        }
+
+        private void OnDestroy()
+        {
+            if (_button != null) _button.onClick.RemoveListener(OnClick);
+            if (_repository != null) _repository.SelectedIndexChanged -= UpdateSelectedUI;
+        }
+    }
+}

Assets/Darkmatter/Code/Features/Coloring/UI/ColorButton.cs.meta

@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: 7e64b829b90144faa3bd2c7f5c0ad291
+timeCreated: 1779970210

Assets/Darkmatter/Code/Features/Coloring/UI/ColorPaletteHolderPresenter.cs

@@ -0,0 +1,32 @@
+using System;
+using Darkmatter.Core.Data.Signals.Features.ShapeBuilder;
+using Darkmatter.Libs.Observer;
+using VContainer.Unity;
+
+namespace Darkmatter.Features.Coloring.UI
+{
+    public class ColorPaletteHolderPresenter : IStartable, IDisposable
+    {
+        private readonly ColorPaletteHolderView _view;
+        private readonly IEventBus _bus;
+
+        private IDisposable _assembledSub;
+
+        public ColorPaletteHolderPresenter(ColorPaletteHolderView view, IEventBus bus)
+        {
+            _view = view;
+            _bus = bus;
+        }
+
+        public void Start()
+        {
+            _view.HideInstant();
+            _assembledSub = _bus.Subscribe<ShapeAssembledSignal>(_ => _view.Show());
+        }
+
+        public void Dispose()
+        {
+            _assembledSub?.Dispose();
+        }
+    }
+}

Assets/Darkmatter/Code/Features/Coloring/UI/ColorPaletteHolderPresenter.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: cc0590d8f6fce4487943575bfb96c32a

Assets/Darkmatter/Code/Features/Coloring/UI/ColorPaletteHolderView.cs

@@ -0,0 +1,76 @@
+using PrimeTween;
+using UnityEngine;
+
+namespace Darkmatter.Features.Coloring.UI
+{
+    [RequireComponent(typeof(CanvasGroup))]
+    public class ColorPaletteHolderView : MonoBehaviour
+    {
+        [SerializeField] private RectTransform spawnRoot;
+        [SerializeField] private RectTransform animatedRoot;
+        [SerializeField] private float showDuration = 0.35f;
+        [SerializeField] private float hideDuration = 0.25f;
+        [SerializeField] private Vector2 hiddenOffset = new(1500f, 0f);
+
+        private CanvasGroup _canvasGroup;
+        private Vector2 _shownAnchoredPos;
+        private Sequence _activeSequence;
+
+        public RectTransform SpawnRoot => spawnRoot;
+
+        private void Awake()
+        {
+            _canvasGroup = GetComponent<CanvasGroup>();
+            if (animatedRoot == null) animatedRoot = (RectTransform)transform;
+            _shownAnchoredPos = animatedRoot.anchoredPosition;
+        }
+
+        public Sequence Show()
+        {
+            KillActive();
+            gameObject.SetActive(true);
+            _canvasGroup.interactable = true;
+            _canvasGroup.blocksRaycasts = true;
+
+            _activeSequence = Sequence.Create()
+                .Group(Tween.UIAnchoredPosition(animatedRoot, _shownAnchoredPos, showDuration, Ease.OutBack))
+                .Group(Tween.Alpha(_canvasGroup, 1f, showDuration, Ease.OutQuad));
+            return _activeSequence;
+        }
+
+        public Sequence Hide()
+        {
+            KillActive();
+            _canvasGroup.interactable = false;
+            _canvasGroup.blocksRaycasts = false;
+
+            var hiddenPos = _shownAnchoredPos + hiddenOffset;
+            _activeSequence = Sequence.Create()
+                .Group(Tween.UIAnchoredPosition(animatedRoot, hiddenPos, hideDuration, Ease.InQuad))
+                .Group(Tween.Alpha(_canvasGroup, 0f, hideDuration, Ease.InQuad))
+                .ChainCallback(() => gameObject.SetActive(false));
+            return _activeSequence;
+        }
+
+        public void HideInstant()
+        {
+            KillActive();
+            animatedRoot.anchoredPosition = _shownAnchoredPos + hiddenOffset;
+            _canvasGroup.alpha = 0f;
+            _canvasGroup.interactable = false;
+            _canvasGroup.blocksRaycasts = false;
+            gameObject.SetActive(false);
+        }
+
+        private void KillActive()
+        {
+            if (_activeSequence.isAlive) _activeSequence.Stop();
+            _activeSequence = default;
+        }
+
+        private void OnDisable()
+        {
+            KillActive();
+        }
+    }
+}

Assets/Darkmatter/Code/Features/Coloring/UI/ColorPaletteHolderView.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: c960fbf3dc5a54f5399178665d20b1ce

Assets/Darkmatter/Code/Features/Coloring/UI/ColorRegionView.cs

@@ -0,0 +1,44 @@
+using System;
+using UnityEngine;
+using UnityEngine.EventSystems;
+using UnityEngine.UI;
+
+namespace Darkmatter.Features.Coloring.UI
+{
+    [RequireComponent(typeof(Image))]
+    public class ColorRegionView : MonoBehaviour, IPointerClickHandler
+    {
+        [field: SerializeField] public string RegionId { get; private set; }
+        [SerializeField, Range(0f, 1f)] private float alphaHitThreshold = 0.5f;
+        public Color Color => _image.color;
+
+        private Image _image;
+        private event Action OnRegionClicked;
+        private void Awake()
+        {
+            _image = GetComponent<Image>();
+            _image.alphaHitTestMinimumThreshold = alphaHitThreshold;
+        }
+
+        public void Initialize(Color color, Action onRegionClicked)
+        {
+            _image.color = color;
+            OnRegionClicked = onRegionClicked;
+        }
+
+        public void SetColor(Color color)
+        {
+            _image.color = color;
+        }
+
+        public void OnPointerClick(PointerEventData eventData)
+        {
+            OnRegionClicked?.Invoke();
+        }
+
+        private void OnDestroy()
+        {
+            OnRegionClicked = null;
+        }
+    }
+}

Assets/Darkmatter/Code/Features/Coloring/UI/ColorRegionView.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 7667901d8aea645d28b5125a2ed546ce

Assets/Darkmatter/Code/Features/GameplayFlow/Features.GameplayFlow.asmdef

@@ -3,8 +3,12 @@
     "rootNamespace": "Darkmatter.Features.GameplayFlow",
     "references": [
         "GUID:6a0a834eb41764f12ba55c3fb04a40cb",
+        "GUID:c1c03c0e5b2f4412b9f2be1c20d6a9b1",
+        "GUID:c176ee863a5e74e88a6517f9f102cf92",
+        "GUID:b4c9f7fbf1e144933a1797dc208ece5f",
         "GUID:b0214a6008ed146ff8f122a6a9c2f6cc",
-        "GUID:c1c03c0e5b2f4412b9f2be1c20d6a9b1"
+        "GUID:f51ebe6a0ceec4240a699833d6309b23",
+        "GUID:80ecb87cae9c44d19824e70ea7229748"
     ],
     "includePlatforms": [],
     "excludePlatforms": [],

Assets/Darkmatter/Code/Features/GameplayFlow/Installers/GameplayFlowFeatureModule.cs

@@ -1,5 +1,6 @@
 using Darkmatter.Core.Contracts.Features.GameplayFlow;
 using Darkmatter.Features.GameplayFlow.SceneRefs;
+using Darkmatter.Features.GameplayFlow.Systems;
 using Darkmatter.Libs.Installers;
 using UnityEngine;
 using VContainer;
@@ -15,6 +16,10 @@ namespace Darkmatter.Features.GameplayFlow
         {
             if (sceneRefs != null)
                 builder.RegisterComponent<IGameplaySceneRefs>(sceneRefs);
+
+            builder.Register<GameplayFlowController>(Lifetime.Singleton)
+                   .As<IGameplayFlowController>()
+                   .As<IAsyncStartable>();
         }
     }
 }

Assets/Darkmatter/Code/Features/GameplayFlow/SceneRefs/GameplaySceneRefs.cs

@@ -6,19 +6,7 @@ namespace Darkmatter.Features.GameplayFlow.SceneRefs
     public class GameplaySceneRefs : MonoBehaviour, IGameplaySceneRefs
     {
         [SerializeField] private RectTransform paperRoot;
-        [SerializeField] private RectTransform slotsParent;
-        [SerializeField] private RectTransform piecesParent;
-        [SerializeField] private RectTransform regionsParent;
-
-        [SerializeField] private RectTransform hudRoot;
-        [SerializeField] private RectTransform trayPanel;
-
 
         public RectTransform PaperRoot => paperRoot;
-        public RectTransform SlotsParent => slotsParent;
-        public RectTransform PiecesParent => piecesParent;
-        public RectTransform RegionsParent => regionsParent;
-        public RectTransform HudRoot => hudRoot;
-        public RectTransform TrayPanel => trayPanel;
     }
 }

Assets/Darkmatter/Code/Features/GameplayFlow/Systems.meta

@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: ef06e7bcb7ee346d894886c4a4848bcd
+folderAsset: yes
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/Darkmatter/Code/Features/GameplayFlow/Systems/GameplayFlowController.cs

@@ -0,0 +1,230 @@
+using System;
+using System.Collections.Generic;
+using System.Threading;
+using Cysharp.Threading.Tasks;
+using Darkmatter.Core.Contracts.Features.Coloring;
+using Darkmatter.Core.Contracts.Features.DrawingCatalog;
+using Darkmatter.Core.Contracts.Features.GameplayFlow;
+using Darkmatter.Core.Contracts.Features.Progression;
+using Darkmatter.Core.Contracts.Features.ShapeBuilder;
+using Darkmatter.Core.Contracts.Services.Scenes;
+using Darkmatter.Core.Data.Dynamic.Features.Progression;
+using Darkmatter.Core.Data.Signals.Features.Coloring;
+using Darkmatter.Core.Data.Signals.Features.ShapeBuilder;
+using Darkmatter.Core.Enums.Features.Progression;
+using Darkmatter.Core.Enums.Services.Scenes;
+using Darkmatter.Libs.Observer;
+using UnityEngine;
+using VContainer.Unity;
+
+namespace Darkmatter.Features.GameplayFlow.Systems
+{
+    public sealed class GameplayFlowController : IAsyncStartable, IGameplayFlowController, IDisposable
+    {
+        private const int AutosaveDebounceMs = 500;
+
+        private readonly IProgressionSystem _progression;
+        private readonly IDrawingTemplateCatalog _catalog;
+        private readonly IShapeBuilderController _shapeBuilder;
+        private readonly IColoringController _coloring;
+        private readonly ISceneService _scenes;
+        private readonly IEventBus _bus;
+
+        private IDrawingTemplate _template;
+        private string _templateId;
+        private DrawingPhase _phase = DrawingPhase.ShapeBuilding;
+
+        private IDisposable _assembledSub;
+        private IDisposable _colorAppliedSub;
+        private CancellationTokenSource _autosaveCts;
+        private CancellationTokenSource _scopeCts;
+
+        public GameplayFlowController(
+            IProgressionSystem progression,
+            IDrawingTemplateCatalog catalog,
+            IShapeBuilderController shapeBuilder,
+            IColoringController coloring,
+            ISceneService scenes,
+            IEventBus bus)
+        {
+            _progression = progression;
+            _catalog = catalog;
+            _shapeBuilder = shapeBuilder;
+            _coloring = coloring;
+            _scenes = scenes;
+            _bus = bus;
+        }
+
+        public async UniTask StartAsync(CancellationToken cancellation)
+        {
+            _scopeCts = CancellationTokenSource.CreateLinkedTokenSource(cancellation);
+            var ct = _scopeCts.Token;
+
+            _templateId = _progression.LastOpenedTemplateId;
+            if (string.IsNullOrEmpty(_templateId))
+                throw new Exception("[GameplayFlow] No LastOpenedTemplateId set. ColorbookFlow must call _progression.SetLastOpenedAsync(id) before loading Gameplay.");
+
+            _template = await _catalog.LoadAsync(_templateId);
+            ct.ThrowIfCancellationRequested();
+
+            var progress = _progression.GetProgress(_templateId);
+            _phase = progress?.phase ?? DrawingPhase.ShapeBuilding;
+
+            await _shapeBuilder.InitializeAsync(ct);
+            ct.ThrowIfCancellationRequested();
+
+            _assembledSub    = _bus.Subscribe<ShapeAssembledSignal>(OnShapeAssembled);
+            _colorAppliedSub = _bus.Subscribe<ColorAppliedSignal>(OnColorApplied);
+
+            if (_phase == DrawingPhase.Coloring)
+            {
+                // Resume direct into coloring: pre-snap every piece. ShapeBuilder
+                // emits ShapeAssembledSignal once counter hits expected; that path
+                // also triggers InitializeColoring with savedColors.
+                var allIds = CollectAllPieceIds(_template);
+                await _shapeBuilder.BuildAsync(_template, allIds, ct);
+            }
+            else
+            {
+                await _shapeBuilder.BuildAsync(_template, progress?.snappedPieces, ct);
+            }
+        }
+
+        public async UniTask BackAsync()
+        {
+            await SaveCurrentAsync(captureThumbnail: _phase == DrawingPhase.Coloring);
+            _shapeBuilder.Clear();
+            _coloring.Clear();
+            await _scenes.LoadSceneAsync(GameScene.Colorbook, progress: null, cancellationToken: default);
+        }
+
+        public async UniTask SaveAsync()
+        {
+            // Explicit user-pressed save — capture thumbnail + (planned) native gallery export.
+            await SaveCurrentAsync(captureThumbnail: true);
+            // TODO: route through ICaptureService + IGalleryService once those exist.
+        }
+
+        public async UniTask NextAsync()
+        {
+            await SaveCurrentAsync(captureThumbnail: true);
+            _progression.MarkCompleted(_templateId);
+
+            var nextId = _catalog.GetNextTemplate(_templateId);
+            if (string.IsNullOrEmpty(nextId))
+            {
+                await _scenes.LoadSceneAsync(GameScene.Colorbook, progress: null, cancellationToken: default);
+                return;
+            }
+
+            await _progression.SetLastOpenedAsync(nextId);
+            _shapeBuilder.Clear();
+            _coloring.Clear();
+            await _scenes.LoadSceneAsync(GameScene.Gameplay, progress: null, cancellationToken: default);
+        }
+
+        public void OnApplicationPaused()
+        {
+            // Fire-and-forget — pause window is small; PlayerPrefs write is sync under the hood.
+            SaveCurrentAsync(captureThumbnail: false).Forget();
+        }
+
+        private void OnShapeAssembled(ShapeAssembledSignal signal)
+        {
+            if (signal.TemplateId != _templateId) return;
+            EnterColoringAsync().Forget();
+        }
+
+        private async UniTask EnterColoringAsync()
+        {
+            _phase = DrawingPhase.Coloring;
+            var progress = _progression.GetProgress(_templateId);
+            var savedColors = ToColorDict(progress?.regionColors);
+
+            await _coloring.InitializeRegionsAsync(_template, savedColors, _scopeCts.Token);
+
+            // Bare-assembled snapshot — catalog should show the puzzle outline even if
+            // the child never paints (per readme §12b save matrix).
+            await SaveCurrentAsync(captureThumbnail: true);
+        }
+
+        private void OnColorApplied(ColorAppliedSignal _)
+        {
+            if (_phase != DrawingPhase.Coloring) return;
+            _autosaveCts?.Cancel();
+            _autosaveCts?.Dispose();
+            _autosaveCts = CancellationTokenSource.CreateLinkedTokenSource(_scopeCts.Token);
+            DebouncedAutosaveAsync(_autosaveCts.Token).Forget();
+        }
+
+        private async UniTaskVoid DebouncedAutosaveAsync(CancellationToken ct)
+        {
+            try
+            {
+                await UniTask.Delay(AutosaveDebounceMs, cancellationToken: ct);
+                await SaveCurrentAsync(captureThumbnail: false);
+            }
+            catch (OperationCanceledException) { /* superseded by next paint or scope end */ }
+        }
+
+        private async UniTask SaveCurrentAsync(bool captureThumbnail)
+        {
+            if (string.IsNullOrEmpty(_templateId)) return;
+
+            var snappedIds = new List<string>(_shapeBuilder.GetSnappedPieceIds());
+            var regionEntries = new List<RegionColorEntry>();
+            foreach (var kv in _coloring.GetCurrentColors())
+                regionEntries.Add(new RegionColorEntry { regionId = kv.Key, color = kv.Value });
+
+            var existing = _progression.GetProgress(_templateId);
+            var progress = new DrawingProgress
+            {
+                templateId        = _templateId,
+                phase             = _phase,
+                snappedPieces     = snappedIds,
+                regionColors      = regionEntries,
+                hasThumbnail      = captureThumbnail || (existing?.hasThumbnail ?? false),
+                hasBeenCompleted  = existing?.hasBeenCompleted ?? false,
+                completionCount   = existing?.completionCount ?? 0,
+                UpdatedUtc        = DateTime.UtcNow,
+                FirstCompletedUtc = existing?.FirstCompletedUtc,
+            };
+
+            byte[] thumbnailPng = null;
+            if (captureThumbnail)
+            {
+                // TODO: replace with ICaptureService.CaptureAsync() once available.
+                // For now we record hasThumbnail=true but write no PNG.
+            }
+
+            await _progression.SaveProgressAsync(progress, thumbnailPng);
+        }
+
+        private static IReadOnlyCollection<string> CollectAllPieceIds(IDrawingTemplate template)
+        {
+            var ids = new List<string>(template.Pieces.Count);
+            foreach (var p in template.Pieces) ids.Add(p.Id);
+            return ids;
+        }
+
+        private static IReadOnlyDictionary<string, Color> ToColorDict(List<RegionColorEntry> entries)
+        {
+            var dict = new Dictionary<string, Color>();
+            if (entries == null) return dict;
+            foreach (var e in entries)
+                if (!string.IsNullOrEmpty(e.regionId))
+                    dict[e.regionId] = e.color;
+            return dict;
+        }
+
+        public void Dispose()
+        {
+            _assembledSub?.Dispose();
+            _colorAppliedSub?.Dispose();
+            _autosaveCts?.Cancel();
+            _autosaveCts?.Dispose();
+            _scopeCts?.Cancel();
+            _scopeCts?.Dispose();
+        }
+    }
+}

Assets/Darkmatter/Code/Features/GameplayFlow/Systems/GameplayFlowController.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 54c118b4507054746befcaa85a1e9578

Assets/Darkmatter/Code/Features/History/Stack/UndoStack.cs

@@ -24,6 +24,14 @@ namespace Darkmatter.Features.History
             OnStackChanged?.Invoke();
         }
 
+        public void Append(ICommand cmd)
+        {
+            _undo.AddLast(cmd);
+            if (_undo.Count > Capacity) _undo.RemoveFirst();
+            _redo.Clear();
+            OnStackChanged?.Invoke();
+        }
+
         public void Undo()
         {
             if (!CanUndo) return;
@@ -50,5 +58,12 @@ namespace Darkmatter.Features.History
             _redo.Clear();
             OnStackChanged?.Invoke();
         }
+
+        public void Drop()
+        {
+            _undo.Clear();
+            _redo.Clear();
+            OnStackChanged?.Invoke();
+        }
     }
 }

Assets/Darkmatter/Code/Features/Progression/Systems/ProgressionRepository.cs

@@ -14,8 +14,10 @@ public sealed class ProgressionRepository
     private const string ThumbnailsFolder = "thumbnails";
 
     private readonly Dictionary<string, DrawingProgress> _records = new();
+    private string _lastOpenedTemplateId;
 
     public IEnumerable<DrawingProgress> AllProgress() => _records.Values;
+    public string LastOpenedTemplateId => _lastOpenedTemplateId;
 
     public DrawingProgress? TryGet(string templateId) =>
         _records.TryGetValue(templateId, out var p) ? p : (DrawingProgress?)null;
@@ -45,6 +47,14 @@ public sealed class ProgressionRepository
                     _records[rec.templateId] = rec;
         }
 
+        _lastOpenedTemplateId = root.lastOpenedTemplateId;
+        return UniTask.CompletedTask;
+    }
+
+    public UniTask SetLastOpenedAsync(string templateId)
+    {
+        _lastOpenedTemplateId = templateId;
+        FlushRoot();
         return UniTask.CompletedTask;
     }
 
@@ -121,6 +131,7 @@ public sealed class ProgressionRepository
         var root = new ProgressionRootDto
         {
             records = _records.Values.ToList(),
+            lastOpenedTemplateId = _lastOpenedTemplateId,
         };
         var json = JsonUtility.ToJson(root);
         ProtectedPlayerPrefs.SetString(PlayerPrefsKeys.Progression, json);

Assets/Darkmatter/Code/Features/Progression/Systems/ProgressionSystem.cs

@@ -15,6 +15,10 @@ public class ProgressionSystem : IProgressionSystem
     private readonly SemaphoreSlim _writeLock = new(1, 1);
 
     public IReadOnlyCollection<string> CompletedTemplateIds => _completed;
+    public string LastOpenedTemplateId => _repository.LastOpenedTemplateId;
+
+    public UniTask SetLastOpenedAsync(string templateId) =>
+        _repository.SetLastOpenedAsync(templateId);
 
     public ProgressionSystem(ProgressionRepository repository)
     {

Assets/Darkmatter/Code/Features/ShapeBuilder/Commands/SnapPieceCommand.cs

@@ -4,7 +4,7 @@ using UnityEngine;
 
 namespace Darkmatter.Features.ShapeBuilder.Commands
 {
-    internal sealed class SnapPieceCommand : ICommand
+    public sealed class SnapPieceCommand : ICommand
     {
         private readonly ShapePiece _piece;
         private readonly Vector2 _prevPos;

Assets/Darkmatter/Code/Features/ShapeBuilder/Installers/ShapeBuilderFeatureModule.cs

@@ -1,6 +1,7 @@
 using Darkmatter.Core.Contracts.Features.ShapeBuilder;
 using Darkmatter.Core.Data.Static.Features.ShapeBuilder;
 using Darkmatter.Features.ShapeBuilder.Systems;
+using Darkmatter.Features.ShapeBuilder.UI;
 using Darkmatter.Libs.Installers;
 using UnityEngine;
 using VContainer;
@@ -11,11 +12,20 @@ namespace Darkmatter.Features.ShapeBuilder.Installers
     public class ShapeBuilderFeatureModule : MonoBehaviour, IModule
     {
         [SerializeField] private ShapeBuilderConfig config;
+        [SerializeField] private ShapeHolderView holderView;
 
         public void Register(IContainerBuilder builder)
         {
             if (config != null)
                 builder.RegisterComponent(config);
+
+            if (holderView != null)
+            {
+                builder.RegisterComponent(holderView);
+                builder.RegisterEntryPoint<ShapeHolderPresenter>().WithParameter(holderView);
+            }
+
+            builder.Register<IShapePieceFactory, ShapePieceFactory>(Lifetime.Singleton);
             builder.Register<IShapeBuilderController, ShapeBuilderController>(Lifetime.Singleton);
         }
     }

Assets/Darkmatter/Code/Features/ShapeBuilder/Systems/IShapePieceFactory.cs

@@ -0,0 +1,11 @@
+using Darkmatter.Core.Data.Static.Features.ShapeBuilder;
+using Darkmatter.Features.ShapeBuilder.UI;
+using UnityEngine;
+
+namespace Darkmatter.Features.ShapeBuilder.Systems
+{
+    public interface IShapePieceFactory
+    {
+        ShapePiece Create(GameObject prefab, ShapeSO shape, SlotMarker slot, Vector2 trayPos);
+    }
+}

Assets/Darkmatter/Code/Features/ShapeBuilder/Systems/IShapePieceFactory.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 7eac815466c2c48b3b37bede20218b99

Assets/Darkmatter/Code/Features/ShapeBuilder/Systems/ShapeBuilderController.cs

@@ -4,13 +4,13 @@ using System.Linq;
 using System.Threading;
 using Cysharp.Threading.Tasks;
 using Darkmatter.Core.Contracts.Features.DrawingCatalog;
+using Darkmatter.Core.Contracts.Features.GameplayFlow;
 using Darkmatter.Core.Contracts.Features.History;
 using Darkmatter.Core.Contracts.Features.ShapeBuilder;
 using Darkmatter.Core.Contracts.Services.Assets;
-using Darkmatter.Core.Contracts.Services.Audio;
-using Darkmatter.Core.Contracts.Features.GameplayFlow;
 using Darkmatter.Core.Data.Signals.Features.ShapeBuilder;
 using Darkmatter.Core.Data.Static.Features.ShapeBuilder;
+using Darkmatter.Features.ShapeBuilder.Commands;
 using Darkmatter.Features.ShapeBuilder.UI;
 using Darkmatter.Libs.Observer;
 using UnityEngine;
@@ -28,48 +28,58 @@ namespace Darkmatter.Features.ShapeBuilder.Systems
         private GameObject _drawingInstance;
         private GameObject _piecePrefab;
         private IDisposable _snappedSub;
+        private IDisposable _unsnappedSub;
 
         private readonly List<string> _snappedPieceIds = new();
-        private readonly ShapeBuilderConfig _cfg;
+        private readonly List<ShapePiece> _pieces = new();
-        private readonly ISfxPlayer _sfx;
         private readonly IEventBus _bus;
-        private readonly IUndoStack _undo;
         private readonly IAssetProviderService _assetProviderService;
-        private readonly IEventBus _eventBus;
+        private readonly IShapePieceFactory _factory;
+        private readonly ShapeHolderView _holder;
         private readonly IGameplaySceneRefs _refs;
+        private readonly IUndoStack _undo;
 
 
         public ShapeBuilderController(
-            ShapeBuilderConfig cfg,
-            ISfxPlayer sfx,
             IEventBus bus,
-            IUndoStack undo,
             IAssetProviderService assetProviderService,
-            IEventBus eventBus,
+            IShapePieceFactory factory,
-            IGameplaySceneRefs refs)
+            ShapeHolderView holder,
+            IGameplaySceneRefs refs,
+            IUndoStack undo)
         {
-            _cfg = cfg;
-            _sfx = sfx;
             _bus = bus;
-            _undo = undo;
             _assetProviderService = assetProviderService;
-            _eventBus = eventBus;
+            _factory = factory;
+            _holder = holder;
             _refs = refs;
+            _undo = undo;
         }
 
         public async UniTask InitializeAsync(CancellationToken cancellationToken)
         {
             await TryLoadPiecePrefabAsync(cancellationToken);
+            cancellationToken.ThrowIfCancellationRequested();
 
-            _snappedSub = _eventBus.Subscribe<PieceSnappedSignal>(OnPieceSnapped);
+            _snappedSub?.Dispose();
+            _unsnappedSub?.Dispose();
+            _snappedSub   = _bus.Subscribe<PieceSnappedSignal>(OnPieceSnapped);
+            _unsnappedSub = _bus.Subscribe<PieceUnsnappedSignal>(OnPieceUnsnapped);
         }
 
         private void OnPieceSnapped(PieceSnappedSignal obj)
         {
+            _snapped++;
             _snappedPieceIds.Add(obj.PieceId);
             CheckIfShapeAssembled();
         }
 
+        private void OnPieceUnsnapped(PieceUnsnappedSignal obj)
+        {
+            _snapped = Mathf.Max(0, _snapped - 1);
+            _snappedPieceIds.Remove(obj.PieceId);
+        }
+
         public async UniTask BuildAsync(
             IDrawingTemplate template,
             IReadOnlyCollection<string> preSnappedIds,
@@ -77,24 +87,27 @@ namespace Darkmatter.Features.ShapeBuilder.Systems
         {
             Clear();
 
-            if (template.Prefab == null)
+            if (template.DrawingPrefab == null)
                 throw new System.Exception($"No drawing layout prefab for '{template.Id}'");
 
-            _drawingInstance = Object.Instantiate(template.Prefab, _refs.PaperRoot);
+            _drawingInstance = Object.Instantiate(template.DrawingPrefab, _refs.PaperRoot);
             ct.ThrowIfCancellationRequested();
 
             var slots = _drawingInstance.GetComponentsInChildren<SlotMarker>(includeInactive: true);
 
             await TryLoadPiecePrefabAsync(ct);
+            ct.ThrowIfCancellationRequested();
 
             int count = template.Pieces.Count;
-            float trayW = _refs.TrayPanel.rect.width;
+            float trayW = _holder.SpawnWidth;
             float pitch = trayW / (count + 1);
 
             _currentTemplateId = template.Id;
             _expected = count;
             _snapped = 0;
 
+            _bus.Publish(new ShapeBuilderStartedSignal(template.Id));
+
             CreateShapePieceInstances(template, preSnappedIds, count, slots, pitch, trayW);
 
             CheckIfShapeAssembled();
@@ -117,13 +130,16 @@ namespace Darkmatter.Features.ShapeBuilder.Systems
                 var trayPos = new Vector2(pitch * (i + 1) - trayW * 0.5f, 0f);
                 bool preSnapped = preSnappedIds != null && preSnappedIds.Contains(shape.Id);
 
-                var go = Object.Instantiate(_piecePrefab, _refs.TrayPanel);
+                var piece = _factory.Create(_piecePrefab, shape, slot, trayPos);
-                go.name = $"Piece_{shape.Id}";
+                _pieces.Add(piece);
 
-                var piece = go.GetComponent<ShapePiece>();
+                if (preSnapped)
-                piece.Setup(shape, slot, _cfg, _sfx, _bus, _undo, trayPos, preSnapped);
+                {
-
+                    _undo.Append(new SnapPieceCommand(piece));
-                if (preSnapped) _snapped++;
+                    piece.SnapInstantly();
+                    _snapped++;
+                    _snappedPieceIds.Add(shape.Id);
+                }
             }
         }
 
@@ -159,11 +175,25 @@ namespace Darkmatter.Features.ShapeBuilder.Systems
 
         public void Clear()
         {
+            _undo.Drop();
+
+            foreach (var piece in _pieces)
+                if (piece != null) Object.Destroy(piece.gameObject);
+            _pieces.Clear();
+
+            if (_drawingInstance != null) Object.Destroy(_drawingInstance);
+            _drawingInstance = null;
+
+            _snappedPieceIds.Clear();
+            _snapped = 0;
+            _expected = 0;
+            _currentTemplateId = null;
         }
 
         public void Dispose()
         {
             _snappedSub?.Dispose();
+            _unsnappedSub?.Dispose();
         }
     }
 }

Assets/Darkmatter/Code/Features/ShapeBuilder/Systems/ShapePieceFactory.cs

@@ -0,0 +1,42 @@
+using Darkmatter.Core.Contracts.Features.History;
+using Darkmatter.Core.Contracts.Services.Audio;
+using Darkmatter.Core.Data.Static.Features.ShapeBuilder;
+using Darkmatter.Features.ShapeBuilder.UI;
+using Darkmatter.Libs.Observer;
+using UnityEngine;
+
+namespace Darkmatter.Features.ShapeBuilder.Systems
+{
+    public sealed class ShapePieceFactory : IShapePieceFactory
+    {
+        private readonly ShapeHolderView _holder;
+        private readonly ShapeBuilderConfig _cfg;
+        private readonly ISfxPlayer _sfx;
+        private readonly IEventBus _bus;
+        private readonly IUndoStack _undo;
+
+        public ShapePieceFactory(
+            ShapeHolderView holder,
+            ShapeBuilderConfig cfg,
+            ISfxPlayer sfx,
+            IEventBus bus,
+            IUndoStack undo)
+        {
+            _holder = holder;
+            _cfg = cfg;
+            _sfx = sfx;
+            _bus = bus;
+            _undo = undo;
+        }
+
+        public ShapePiece Create(GameObject prefab, ShapeSO shape, SlotMarker slot, Vector2 trayPos)
+        {
+            var go = Object.Instantiate(prefab, _holder.SpawnRoot);
+            go.name = $"Piece_{shape.Id}";
+
+            var piece = go.GetComponent<ShapePiece>();
+            piece.Setup(shape, slot, _cfg, _sfx, _bus, _undo, trayPos);
+            return piece;
+        }
+    }
+}

Assets/Darkmatter/Code/Features/ShapeBuilder/Systems/ShapePieceFactory.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 34f1057e9a8774bbbaf0aac5ac1ae1a8

Assets/Darkmatter/Code/Features/ShapeBuilder/UI/ShapeHolderPresenter.cs

@@ -0,0 +1,35 @@
+using System;
+using Darkmatter.Core.Data.Signals.Features.ShapeBuilder;
+using Darkmatter.Libs.Observer;
+using VContainer.Unity;
+
+namespace Darkmatter.Features.ShapeBuilder.UI
+{
+    public class ShapeHolderPresenter : IStartable, IDisposable
+    {
+        private readonly ShapeHolderView _view;
+        private readonly IEventBus _bus;
+
+        private IDisposable _startedSub;
+        private IDisposable _assembledSub;
+
+        public ShapeHolderPresenter(ShapeHolderView view, IEventBus bus)
+        {
+            _view = view;
+            _bus = bus;
+        }
+
+        public void Start()
+        {
+            _view.HideInstant();
+            _startedSub = _bus.Subscribe<ShapeBuilderStartedSignal>(_ => _view.Show());
+            _assembledSub = _bus.Subscribe<ShapeAssembledSignal>(_ => _view.Hide());
+        }
+
+        public void Dispose()
+        {
+            _startedSub?.Dispose();
+            _assembledSub?.Dispose();
+        }
+    }
+}

Assets/Darkmatter/Code/Features/ShapeBuilder/UI/ShapeHolderPresenter.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: bdc42ff3cf54249eba34beb822f4e9fb

Assets/Darkmatter/Code/Features/ShapeBuilder/UI/ShapeHolderView.cs

@@ -0,0 +1,77 @@
+using PrimeTween;
+using UnityEngine;
+
+namespace Darkmatter.Features.ShapeBuilder.UI
+{
+    [RequireComponent(typeof(CanvasGroup))]
+    public class ShapeHolderView : MonoBehaviour
+    {
+        [SerializeField] private RectTransform spawnRoot;
+        [SerializeField] private RectTransform animatedRoot;
+        [SerializeField] private float showDuration = 0.35f;
+        [SerializeField] private float hideDuration = 0.25f;
+        [SerializeField] private Vector2 hiddenOffset = new(1500f, 0f);
+
+        private CanvasGroup _canvasGroup;
+        private Vector2 _shownAnchoredPos;
+        private Sequence _activeSequence;
+
+        public RectTransform SpawnRoot => spawnRoot;
+        public float SpawnWidth => spawnRoot.rect.width;
+
+        private void Awake()
+        {
+            _canvasGroup = GetComponent<CanvasGroup>();
+            if (animatedRoot == null) animatedRoot = (RectTransform)transform;
+            _shownAnchoredPos = animatedRoot.anchoredPosition;
+        }
+
+        public Sequence Show()
+        {
+            KillActive();
+            gameObject.SetActive(true);
+            _canvasGroup.interactable = true;
+            _canvasGroup.blocksRaycasts = true;
+
+            _activeSequence = Sequence.Create()
+                .Group(Tween.UIAnchoredPosition(animatedRoot, _shownAnchoredPos, showDuration, Ease.OutBack))
+                .Group(Tween.Alpha(_canvasGroup, 1f, showDuration, Ease.OutQuad));
+            return _activeSequence;
+        }
+
+        public Sequence Hide()
+        {
+            KillActive();
+            _canvasGroup.interactable = false;
+            _canvasGroup.blocksRaycasts = false;
+
+            var hiddenPos = _shownAnchoredPos + hiddenOffset;
+            _activeSequence = Sequence.Create()
+                .Group(Tween.UIAnchoredPosition(animatedRoot, hiddenPos, hideDuration, Ease.InQuad))
+                .Group(Tween.Alpha(_canvasGroup, 0f, hideDuration, Ease.InQuad))
+                .ChainCallback(() => gameObject.SetActive(false));
+            return _activeSequence;
+        }
+
+        public void HideInstant()
+        {
+            KillActive();
+            animatedRoot.anchoredPosition = _shownAnchoredPos + hiddenOffset;
+            _canvasGroup.alpha = 0f;
+            _canvasGroup.interactable = false;
+            _canvasGroup.blocksRaycasts = false;
+            gameObject.SetActive(false);
+        }
+
+        private void KillActive()
+        {
+            if (_activeSequence.isAlive) _activeSequence.Stop();
+            _activeSequence = default;
+        }
+
+        private void OnDisable()
+        {
+            KillActive();
+        }
+    }
+}

Assets/Darkmatter/Code/Features/ShapeBuilder/UI/ShapeHolderView.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 7763b07d532494bda8fa4cc10344dbd6

Assets/Darkmatter/Code/Features/ShapeBuilder/UI/ShapePiece.cs

@@ -48,8 +48,7 @@ namespace Darkmatter.Features.ShapeBuilder.UI
             ISfxPlayer sfx,
             IEventBus bus,
             IUndoStack undo,
-            Vector2 trayPos,
+            Vector2 trayPos)
-            bool preSnapped)
         {
             _shape    = shape;
             _slot     = slot;
@@ -62,8 +61,6 @@ namespace Darkmatter.Features.ShapeBuilder.UI
 
             image.sprite = shape.Sprite;
             ApplyTrayPose();
-
-            if (preSnapped) SnapInstantly();
         }
 
         public void OnBeginDrag(PointerEventData e)
@@ -154,7 +151,7 @@ namespace Darkmatter.Features.ShapeBuilder.UI
             _bus.Publish(new PieceUnsnappedSignal(_shape.Id));
         }
 
-        private void SnapInstantly()
+        public void SnapInstantly()
         {
             Lock();
             var slot = _slot.RectTransform;
@@ -192,5 +189,12 @@ namespace Darkmatter.Features.ShapeBuilder.UI
                 _parentRect, screenPos, _eventCam, out var local);
             return local;
         }
+
+        private void OnDestroy()
+        {
+            // Kill any tweens that were targeting this piece's RectTransform so
+            // PrimeTween doesn't keep writing into a destroyed transform.
+            Tween.StopAll(onTarget: RectTransform);
+        }
     }
 }

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Assets/Darkmatter/Content/Colorbook UI/ColorBookUI/Topic.png.meta

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Assets/Darkmatter/Content/Colorbook UI/DrawingItems/Aeroplane/Aeroplane Outline.png.meta

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Assets/Darkmatter/Content/Colorbook UI/DrawingItems/Aeroplane/Aeroplane window.png.meta

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Assets/Darkmatter/Content/Colorbook UI/DrawingItems/Aeroplane/Aeroplane wing 1.png.meta

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Assets/Darkmatter/Content/Colorbook UI/DrawingItems/Aeroplane/Areroblane Body.png.meta

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Assets/Darkmatter/Content/Colorbook UI/DrawingItems/Aeroplane/Areroplane Reference.png.meta

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