feat: port retail magic lifecycle and retained spell UI

Complete the retail cast-intent, target, component, enchantment, and busy-state paths; mount the DAT-authored spell bar, spellbook, component book, effects panels, and shared panel lifecycle; and add scoped input plus conformance coverage.

Co-Authored-By: Codex <noreply@openai.com>

tests/AcDream.App.Tests/UI/Layout/EffectsIndicatorControllerTests.cs

@@ -0,0 +1,102 @@
+using AcDream.App.UI;
+using AcDream.App.UI.Layout;
+using AcDream.Core.Spells;
+
+namespace AcDream.App.Tests.UI.Layout;
+
+public sealed class EffectsIndicatorControllerTests
+{
+    private static (uint, int, int) NoTex(uint _) => (0u, 0, 0);
+
+    [Fact]
+    public void AuthoredFixture_BuildsRetailIndicatorButtons()
+    {
+        ElementInfo info = FixtureLoader.LoadIndicatorsInfos();
+        Assert.Equal(0x10000610u, info.Id);
+        Assert.Equal(150f, info.Width);
+        Assert.Equal(30f, info.Height);
+
+        ImportedLayout layout = LayoutImporter.Build(info, NoTex, datFont: null);
+        Assert.IsType<UiButton>(layout.FindElement(EffectsIndicatorController.HelpfulButtonId));
+        Assert.IsType<UiButton>(layout.FindElement(EffectsIndicatorController.HarmfulButtonId));
+    }
+
+    [Fact]
+    public void Enchantments_GhostAndEnableMatchingIndicator_ThenClickCorrectPanel()
+    {
+        var table = SpellTable.LoadFromReader(new StringReader(
+            "Spell ID,Name,Flags [Hex]\n42,Boon,0x4\n43,Bane,0x0\n"));
+        var spellbook = new Spellbook(table);
+        ImportedLayout layout = BuildSyntheticLayout();
+        var toggled = new List<uint>();
+        using EffectsIndicatorController controller = EffectsIndicatorController.Bind(
+            layout, spellbook, toggled.Add)!;
+        UiButton helpful = Assert.IsType<UiButton>(
+            layout.FindElement(EffectsIndicatorController.HelpfulButtonId));
+        UiButton harmful = Assert.IsType<UiButton>(
+            layout.FindElement(EffectsIndicatorController.HarmfulButtonId));
+
+        Assert.False(helpful.Enabled);
+        Assert.False(harmful.Enabled);
+
+        spellbook.OnEnchantmentAdded(new ActiveEnchantmentRecord(
+            42u, 10u, 60f, 1u, Bucket: 4u, SpellCategory: 42u));
+        spellbook.OnEnchantmentAdded(new ActiveEnchantmentRecord(
+            43u, 11u, 60f, 2u, Bucket: 8u, SpellCategory: 43u));
+        Assert.False(helpful.Enabled);
+        Assert.False(harmful.Enabled);
+
+        spellbook.OnEnchantmentAdded(new ActiveEnchantmentRecord(
+            42u, 1u, 60f, 1u, Bucket: 1u, SpellCategory: 99u, PowerLevel: 1u));
+        Assert.True(helpful.Enabled);
+        Assert.False(harmful.Enabled);
+        helpful.OnEvent(new UiEvent(0, helpful, UiEventType.Click));
+        Assert.Equal([RetailPanelCatalog.PositiveEffects], toggled);
+
+        spellbook.OnEnchantmentAdded(new ActiveEnchantmentRecord(
+            43u, 1u, 60f, 2u, Bucket: 2u, SpellCategory: 99u, PowerLevel: 7u));
+        // The harmful spell wins the shared category in the effects list, but
+        // retail's raw registry counters keep both indicator types enabled.
+        Assert.True(helpful.Enabled);
+        Assert.True(harmful.Enabled);
+        harmful.OnEvent(new UiEvent(0, harmful, UiEventType.Click));
+        Assert.Equal(
+            [RetailPanelCatalog.PositiveEffects, RetailPanelCatalog.NegativeEffects],
+            toggled);
+
+        spellbook.OnEnchantmentRemoved(1u, 42u);
+        Assert.False(helpful.Enabled);
+        Assert.True(harmful.Enabled);
+    }
+
+    private static ImportedLayout BuildSyntheticLayout()
+    {
+        var root = new ElementInfo { Id = 1u, Type = 3u, Width = 150f, Height = 30f };
+        var helpful = ButtonInfo(EffectsIndicatorController.HelpfulButtonId);
+        var harmful = ButtonInfo(EffectsIndicatorController.HarmfulButtonId);
+        return LayoutImporter.BuildFromInfos(root, [helpful, harmful], NoTex, null);
+    }
+
+    private static ElementInfo ButtonInfo(uint id)
+    {
+        var info = new ElementInfo
+        {
+            Id = id,
+            Type = EffectsIndicatorController.RetailClassId,
+            Width = 20f,
+            Height = 20f,
+            DefaultStateId = UiButtonStateMachine.Normal,
+        };
+        info.States[UiButtonStateMachine.Normal] = new UiStateInfo
+        {
+            Id = UiButtonStateMachine.Normal,
+            Name = "Normal",
+        };
+        info.States[UiButtonStateMachine.Ghosted] = new UiStateInfo
+        {
+            Id = UiButtonStateMachine.Ghosted,
+            Name = "Ghosted",
+        };
+        return info;
+    }
+}