fix(ui): render live component counts

Port retail text-surface clipping so the 15px component count field remains visible under the 16px DAT font. Cover SetStackSize decrements and final component removal while preserving desired restock values.

Co-authored-by: OpenAI Codex <codex@openai.com>

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

@@ -323,9 +323,12 @@ public sealed class SpellbookWindowControllerTests
         Assert.Equal("Copper Scarab", Assert.Single(
             Assert.IsType<UiText>(copper.Content.FindElement(
                 ComponentBookTemplateFactory.NameId)).LinesProvider()).Text);
-        Assert.Equal("2", Assert.Single(
-            Assert.IsType<UiText>(copper.Content.FindElement(
-                ComponentBookTemplateFactory.OwnedCountId)).LinesProvider()).Text);
+        UiText ownedCount = Assert.IsType<UiText>(copper.Content.FindElement(
+            ComponentBookTemplateFactory.OwnedCountId));
+        Assert.Equal((224f, 0f, 60f, 15f),
+            (ownedCount.Left, ownedCount.Top, ownedCount.Width, ownedCount.Height));
+        Assert.False(ownedCount.OneLine);
+        Assert.Equal("2", Assert.Single(ownedCount.LinesProvider()).Text);
         UiField desiredField = Assert.IsType<UiField>(copper.Content.FindElement(
             ComponentBookTemplateFactory.DesiredCountId));
         Assert.Equal((224f, 15f, 60f, 15f),
@@ -361,6 +364,27 @@ public sealed class SpellbookWindowControllerTests
         Assert.False(copper.Selected);
         selection.Select(0xDEADBEEFu, SelectionChangeSource.World);
         Assert.False(amaranth.Selected);
+
+        // ACE consumes components through SetStackSize (0x0197). The object table
+        // publishes ObjectUpdated; the controller rebuilds the tracker total on Tick.
+        Assert.True(objects.UpdateStackSize(10u, stackSize: 1, value: 0));
+        controller.Tick();
+        UiTemplateListSlot updatedCopper = Assert.IsType<UiTemplateListSlot>(list.GetItem(1));
+        Assert.Equal("1", Assert.Single(
+            Assert.IsType<UiText>(updatedCopper.Content.FindElement(
+                ComponentBookTemplateFactory.OwnedCountId)).LinesProvider()).Text);
+        Assert.Equal("21", Assert.IsType<UiField>(updatedCopper.Content.FindElement(
+            ComponentBookTemplateFactory.DesiredCountId)).Text);
+
+        // Consuming the final item removes its object. The row disappears while the
+        // category remains because Diamond Scarab is still owned.
+        Assert.True(objects.Remove(10u));
+        controller.Tick();
+        Assert.DoesNotContain(
+            Enumerable.Range(0, list.GetNumUIItems())
+                .Select(list.GetItem)
+                .OfType<UiTemplateListSlot>(),
+            slot => slot.EntryId == 100u);
     }
 
     private static SpellbookWindowController? Bind(

tests/AcDream.App.Tests/UI/UiTextTests.cs

@@ -277,4 +277,36 @@ public class UiTextTests
 
         Assert.Equal(9f, y);
     }
+
+    [Fact]
+    public void LineIntersectsViewport_PartialLineRemainsDrawable()
+    {
+        // Component owned-count boxes are 15px tall while Font 0x40000000
+        // advances 16px. Retail clips the final pixel instead of dropping the line.
+        Assert.True(UiText.LineIntersectsViewport(
+            lineTop: 0f,
+            lineHeight: 16f,
+            viewportTop: 0f,
+            viewportBottom: 15f));
+
+        Assert.True(UiText.LineIntersectsViewport(
+            lineTop: -1f,
+            lineHeight: 16f,
+            viewportTop: 0f,
+            viewportBottom: 15f));
+    }
+
+    [Theory]
+    [InlineData(-16f, 16f)]
+    [InlineData(15f, 16f)]
+    public void LineIntersectsViewport_FullyClippedLineIsSkipped(
+        float lineTop,
+        float lineHeight)
+    {
+        Assert.False(UiText.LineIntersectsViewport(
+            lineTop,
+            lineHeight,
+            viewportTop: 0f,
+            viewportBottom: 15f));
+    }
 }