fix(text): show selected formatting and style controls

Use category-filtered font and selected-item dropdowns, separate horizontal and vertical alignment, and reuse the border-color palette templates for text color. Persist vertical alignment additively. Follow the established static text-source pattern: https://obsproject.com/kb/text-sources

ytLive.Tests/SourceTextSettingsTests.cs

@@ -18,6 +18,9 @@ public class SourceTextSettingsTests
         Assert.False(source.TextItalic);
         Assert.False(source.TextUnderline);
         Assert.Equal(TextLayerAlignment.Left, source.TextAlignment);
+        Assert.Equal(TextLayerVerticalAlignment.Top, source.TextVerticalAlignment);
+        Assert.Equal("#FFFFFF", source.TextColorEntry.Hex);
+        Assert.Contains(source.TextColorOptions, color => color.Hex == "#FFFFFF");
     }
 
     [Fact]
@@ -29,12 +32,14 @@ public class SourceTextSettingsTests
             TextFontSize = double.NaN,
             TextColor = "not-a-color",
             TextAlignment = (TextLayerAlignment)999,
+            TextVerticalAlignment = (TextLayerVerticalAlignment)999,
         };
 
         Assert.Equal("Segoe UI", source.TextFontFamily);
         Assert.Equal(48, source.TextFontSize);
         Assert.Equal("#FFFFFF", source.TextColor);
         Assert.Equal(TextLayerAlignment.Left, source.TextAlignment);
+        Assert.Equal(TextLayerVerticalAlignment.Top, source.TextVerticalAlignment);
 
         source.TextFontSize = 1;
         Assert.Equal(8, source.TextFontSize);
@@ -42,5 +47,11 @@ public class SourceTextSettingsTests
         Assert.Equal(300, source.TextFontSize);
         source.TextColor = "#abcdef";
         Assert.Equal("#ABCDEF", source.TextColor);
+
+        source.TextColorEntry = BorderColorPalette.All.Single(color => color.Hex == "#FF0000");
+        Assert.Equal("#FF0000", source.TextColor);
+        Assert.Equal("Red", source.TextColorEntry.Name);
+        source.TextColor = "#123456";
+        Assert.Contains(source.TextColorOptions, color => color.Hex == "#123456");
     }
 }