Fix unread indicator color

Multiplatform/Shared/AppAssets.swift

@@ -118,6 +118,14 @@ struct AppAssets {
 		#endif
 	}()
 	
+	static var sidebarUnreadCountBackground: Color = {
+		return Color("SidebarUnreadCountBackground")
+	}()
+	
+	static var sidebarUnreadCountForeground: Color = {
+		return Color("SidebarUnreadCountForeground")
+	}()
+	
 	static var shareImage: Image = {
 		Image(systemName: "square.and.arrow.up")
 	}()

Multiplatform/Shared/Assets.xcassets/SidebarUnreadCountBackground.colorset/Contents.json

@@ -0,0 +1,20 @@
+{
+  "colors" : [
+    {
+      "color" : {
+        "color-space" : "srgb",
+        "components" : {
+          "alpha" : "0.500",
+          "blue" : "0.000",
+          "green" : "0.000",
+          "red" : "0.000"
+        }
+      },
+      "idiom" : "universal"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

Multiplatform/Shared/Assets.xcassets/SidebarUnreadCountForeground.colorset/Contents.json

@@ -0,0 +1,20 @@
+{
+  "colors" : [
+    {
+      "color" : {
+        "color-space" : "srgb",
+        "components" : {
+          "alpha" : "0.900",
+          "blue" : "1.000",
+          "green" : "1.000",
+          "red" : "1.000"
+        }
+      },
+      "idiom" : "universal"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

Multiplatform/Shared/Sidebar/UnreadCountView.swift

@@ -17,7 +17,8 @@ struct UnreadCountView: View {
 			.font(.footnote)
 			.padding(.horizontal, 7)
 			.padding(.vertical, 1)
-			.background(SwiftUI.Color.gray.opacity(0.5))
+			.background(AppAssets.sidebarUnreadCountBackground)
+			.foregroundColor(AppAssets.sidebarUnreadCountForeground)
 			.cornerRadius(8)
     }
 }

Shared/Extensions/NSAttributedString+NetNewsWire.swift

@@ -12,7 +12,6 @@ import RSParser
 import AppKit
 typealias Font = NSFont
 typealias FontDescriptor = NSFontDescriptor
-typealias Color = NSColor
 
 private let boldTrait = NSFontDescriptor.SymbolicTraits.bold
 private let italicTrait = NSFontDescriptor.SymbolicTraits.italic