diff --git a/unity-client/Assets/Scripts/UI/PreconController.cs b/unity-client/Assets/Scripts/UI/PreconController.cs
new file mode 100644
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+++ b/unity-client/Assets/Scripts/UI/PreconController.cs
@@ -0,0 +1,403 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.UI;
+using UnityEngine.SceneManagement;
+using TMPro;
+using Newtonsoft.Json;
+using CommanderAILab.Models;
+using CommanderAILab.Services;
+
+namespace CommanderAILab.UI
+{
+  /// <summary>
+  /// Precon browser scene — browse, search, and install preconstructed Commander decks.
+  /// Grid display with card images, deck details panel, install/install-all buttons,
+  /// and refresh from GitHub functionality.
+  /// </summary>
+  public class PreconController : MonoBehaviour
+  {
+    // -- Header ——————————————————————————————————
+    [Header("Navigation")]
+    [SerializeField] private Button backButton;
+
+    [Header("Search & Filter")]
+    [SerializeField] private TMP_InputField searchInput;
+    [SerializeField] private TMP_Dropdown colorFilterDropdown;
+    [SerializeField] private Button       searchButton;
+    [SerializeField] private Button       clearButton;
+
+    [Header("Deck Grid")]
+    [SerializeField] private Transform    deckGridParent;
+    [SerializeField] private GameObject   deckCardPrefab;
+    [SerializeField] private ScrollRect   gridScrollRect;
+
+    [Header("Deck Detail Panel")]
+    [SerializeField] private GameObject   detailPanel;
+    [SerializeField] private Image        detailCommanderImage;
+    [SerializeField] private TMP_Text     detailDeckName;
+    [SerializeField] private TMP_Text     detailColorIdentity;
+    [SerializeField] private TMP_Text     detailCardCount;
+    [SerializeField] private TMP_Text     detailThemeText;
+    [SerializeField] private Button       detailInstallButton;
+    [SerializeField] private Button       detailCloseButton;
+
+    [Header("Batch Actions")]
+    [SerializeField] private Button       installAllButton;
+    [SerializeField] private Button       refreshButton;
+    [SerializeField] private TMP_Text     statusText;
+
+    [Header("Loading & Error")]
+    [SerializeField] private GameObject   loadingSpinner;
+    [SerializeField] private GameObject   errorPanel;
+    [SerializeField] private TMP_Text     errorText;
+    [SerializeField] private Button       retryButton;
+
+    // -- State ——————————————————————————————————
+    private List<PreconDeck> _allPrecons = new();
+    private List<PreconDeck> _filteredPrecons = new();
+    private PreconDeck       _selectedPrecon;
+    private bool             _isLoading = false;
+    private HashSet<string>  _installedDecks = new();
+
+    // -- Serializable response wrappers ———————————————————
+    [Serializable]
+    private class PreconListResponse
+    {
+      public List<PreconDeck> precons;
+    }
+
+    [Serializable]
+    public class PreconDeck
+    {
+      public string fileName;
+      public string name;
+      public string commander;
+      public string colorIdentity;
+      public int    cardCount;
+      public string theme;
+      public string imageUrl;
+    }
+
+    [Serializable]
+    private class InstallRequest
+    {
+      public string fileName;
+    }
+
+    [Serializable]
+    private class InstallResponse
+    {
+      public bool   installed;
+      public string deckName;
+      public string destination;
+      public string message;
+    }
+
+    [Serializable]
+    private class BatchInstallRequest
+    {
+      public List<string> fileNames;
+    }
+
+    [Serializable]
+    private class BatchInstallResponse
+    {
+      public List<BatchInstallResult> results;
+    }
+
+    [Serializable]
+    private class BatchInstallResult
+    {
+      public string fileName;
+      public bool   installed;
+      public string deckName;
+      public string error;
+    }
+
+    [Serializable]
+    private class RefreshResponse
+    {
+      public string message;
+      public int    total;
+    }
+
+    // ========================================================
+    // Lifecycle
+    // ========================================================
+
+    private void Start()
+    {
+      backButton.onClick.AddListener(OnBack);
+      searchButton.onClick.AddListener(OnSearch);
+      clearButton.onClick.AddListener(OnClear);
+      retryButton.onClick.AddListener(LoadPrecons);
+      installAllButton.onClick.AddListener(OnInstallAll);
+      refreshButton.onClick.AddListener(OnRefresh);
+      detailInstallButton.onClick.AddListener(OnInstallSelected);
+      detailCloseButton.onClick.AddListener(() => detailPanel.SetActive(false));
+
+      if (searchInput != null)
+        searchInput.onSubmit.AddListener(_ => OnSearch());
+
+      detailPanel.SetActive(false);
+      errorPanel.SetActive(false);
+
+      LoadPrecons();
+    }
+
+    // ========================================================
+    // Data Loading
+    // ========================================================
+
+    private void LoadPrecons()
+    {
+      if (_isLoading) return;
+      _isLoading = true;
+      loadingSpinner.SetActive(true);
+      errorPanel.SetActive(false);
+      statusText.text = "Loading precons...";
+
+      ApiClient.Instance.Get<PreconListResponse>(
+        "/api/lab/precons",
+        OnPreconsLoaded,
+        OnError
+      );
+    }
+
+    private void OnPreconsLoaded(PreconListResponse response)
+    {
+      _isLoading = false;
+      loadingSpinner.SetActive(false);
+
+      _allPrecons = response.precons ?? new List<PreconDeck>();
+      statusText.text = $"{_allPrecons.Count} precon deck(s) available";
+
+      ApplyFilter();
+    }
+
+    // ========================================================
+    // Search & Filter
+    // ========================================================
+
+    private void OnSearch()
+    {
+      ApplyFilter();
+    }
+
+    private void OnClear()
+    {
+      searchInput.text = "";
+      if (colorFilterDropdown != null)
+        colorFilterDropdown.value = 0;
+      ApplyFilter();
+    }
+
+    private void ApplyFilter()
+    {
+      string query = searchInput.text.Trim().ToLowerInvariant();
+      string colorFilter = "";
+      if (colorFilterDropdown != null && colorFilterDropdown.value > 0)
+        colorFilter = colorFilterDropdown.options[colorFilterDropdown.value].text;
+
+      _filteredPrecons = _allPrecons.FindAll(p =>
+      {
+        bool matchesSearch = string.IsNullOrEmpty(query)
+          || (p.name != null && p.name.ToLowerInvariant().Contains(query))
+          || (p.commander != null && p.commander.ToLowerInvariant().Contains(query))
+          || (p.theme != null && p.theme.ToLowerInvariant().Contains(query));
+
+        bool matchesColor = string.IsNullOrEmpty(colorFilter)
+          || (p.colorIdentity != null && p.colorIdentity.Contains(colorFilter));
+
+        return matchesSearch && matchesColor;
+      });
+
+      RenderGrid();
+    }
+
+    // ========================================================
+    // Grid Rendering
+    // ========================================================
+
+    private void RenderGrid()
+    {
+      // Clear existing children
+      for (int i = deckGridParent.childCount - 1; i >= 0; i--)
+        Destroy(deckGridParent.GetChild(i).gameObject);
+
+      foreach (var precon in _filteredPrecons)
+      {
+        var card = Instantiate(deckCardPrefab, deckGridParent);
+        var texts = card.GetComponentsInChildren<TMP_Text>(true);
+        if (texts.Length > 0) texts[0].text = precon.name ?? precon.fileName;
+        if (texts.Length > 1) texts[1].text = precon.commander ?? "";
+        if (texts.Length > 2) texts[2].text = precon.colorIdentity ?? "";
+
+        // Installed badge
+        bool installed = _installedDecks.Contains(precon.fileName);
+        var badge = card.transform.Find("InstalledBadge");
+        if (badge != null) badge.gameObject.SetActive(installed);
+
+        // Click to show detail
+        var btn = card.GetComponent<Button>() ?? card.AddComponent<Button>();
+        var captured = precon;
+        btn.onClick.AddListener(() => ShowDetail(captured));
+
+        // Load commander image async
+        if (!string.IsNullOrEmpty(precon.imageUrl))
+        {
+          var img = card.GetComponentInChildren<Image>();
+          if (img != null)
+            StartCoroutine(LoadImageAsync(precon.imageUrl, img));
+        }
+      }
+
+      statusText.text = $"Showing {_filteredPrecons.Count} of {_allPrecons.Count} precon(s)";
+    }
+
+    private IEnumerator LoadImageAsync(string url, Image target)
+    {
+      using var request = UnityEngine.Networking.UnityWebRequestTexture.GetTexture(url);
+      yield return request.SendWebRequest();
+      if (request.result == UnityEngine.Networking.UnityWebRequest.Result.Success)
+      {
+        var tex = UnityEngine.Networking.DownloadHandlerTexture.GetContent(request);
+        target.sprite = Sprite.Create(tex, new Rect(0, 0, tex.width, tex.height), Vector2.one * 0.5f);
+      }
+    }
+
+    // ========================================================
+    // Detail Panel
+    // ========================================================
+
+    private void ShowDetail(PreconDeck precon)
+    {
+      _selectedPrecon = precon;
+      detailPanel.SetActive(true);
+
+      detailDeckName.text = precon.name ?? precon.fileName;
+      detailColorIdentity.text = $"Colors: {precon.colorIdentity ?? "N/A"}";
+      detailCardCount.text = $"Cards: {precon.cardCount}";
+      detailThemeText.text = $"Theme: {precon.theme ?? "N/A"}";
+
+      bool installed = _installedDecks.Contains(precon.fileName);
+      detailInstallButton.interactable = !installed;
+      detailInstallButton.GetComponentInChildren<TMP_Text>().text =
+        installed ? "Installed" : "Install to Forge";
+
+      if (!string.IsNullOrEmpty(precon.imageUrl))
+        StartCoroutine(LoadImageAsync(precon.imageUrl, detailCommanderImage));
+    }
+
+    // ========================================================
+    // Install Actions
+    // ========================================================
+
+    private void OnInstallSelected()
+    {
+      if (_selectedPrecon == null) return;
+      detailInstallButton.interactable = false;
+      statusText.text = $"Installing {_selectedPrecon.name}...";
+
+      var req = new InstallRequest { fileName = _selectedPrecon.fileName };
+      ApiClient.Instance.Post<InstallRequest, InstallResponse>(
+        "/api/lab/precons/install", req,
+        res =>
+        {
+          _installedDecks.Add(_selectedPrecon.fileName);
+          statusText.text = res.message;
+          detailInstallButton.GetComponentInChildren<TMP_Text>().text = "Installed";
+          RenderGrid();
+        },
+        OnError
+      );
+    }
+
+    private void OnInstallAll()
+    {
+      var toInstall = _filteredPrecons.FindAll(p => !_installedDecks.Contains(p.fileName));
+      if (toInstall.Count == 0)
+      {
+        statusText.text = "All visible precons already installed.";
+        return;
+      }
+
+      installAllButton.interactable = false;
+      statusText.text = $"Installing {toInstall.Count} precon(s)...";
+
+      var req = new BatchInstallRequest
+      {
+        fileNames = toInstall.ConvertAll(p => p.fileName)
+      };
+
+      ApiClient.Instance.Post<BatchInstallRequest, BatchInstallResponse>(
+        "/api/lab/precons/install-batch", req,
+        res =>
+        {
+          int successCount = 0;
+          foreach (var r in res.results)
+          {
+            if (r.installed)
+            {
+              _installedDecks.Add(r.fileName);
+              successCount++;
+            }
+          }
+          statusText.text = $"Installed {successCount} of {res.results.Count} precon(s).";
+          installAllButton.interactable = true;
+          RenderGrid();
+        },
+        OnError
+      );
+    }
+
+    private void OnRefresh()
+    {
+      refreshButton.interactable = false;
+      statusText.text = "Refreshing precon database from GitHub...";
+      loadingSpinner.SetActive(true);
+
+      ApiClient.Instance.PostRaw(
+        "/api/lab/precons/refresh", "{}",
+        json =>
+        {
+          var res = JsonConvert.DeserializeObject<RefreshResponse>(json);
+          statusText.text = res.message;
+          refreshButton.interactable = true;
+          LoadPrecons();
+        },
+        err =>
+        {
+          refreshButton.interactable = true;
+          loadingSpinner.SetActive(false);
+          OnError(err);
+        }
+      );
+    }
+
+    // ========================================================
+    // Navigation
+    // ========================================================
+
+    private void OnBack()
+    {
+      SceneManager.LoadScene("MainMenu");
+    }
+
+    // ========================================================
+    // Error Handling
+    // ========================================================
+
+    private void OnError(string error)
+    {
+      _isLoading = false;
+      loadingSpinner.SetActive(false);
+      errorPanel.SetActive(true);
+      errorText.text = $"Error: {error}";
+      statusText.text = "An error occurred.";
+      Debug.LogWarning($"[PreconController] {error}");
+    }
+  }
+}