[GUI] split shared theme into resource dictionaries (#669)

src/SharpEmu.GUI/Themes/Styles/Console.axaml

@@ -0,0 +1,18 @@
+<!--
+Copyright (C) 2026 SharpEmu Emulator Project
+SPDX-License-Identifier: GPL-2.0-or-later
+Console list typography and compact item spacing.
+-->
+
+<Styles xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+  <Style Selector="ListBox.console">
+    <Setter Property="Background" Value="#0B0E14" />
+    <Setter Property="FontFamily" Value="Cascadia Mono, Consolas, Courier New, monospace" />
+    <Setter Property="FontSize" Value="12" />
+  </Style>
+  <Style Selector="ListBox.console ListBoxItem">
+    <Setter Property="Padding" Value="10,1" />
+    <Setter Property="MinHeight" Value="0" />
+  </Style>
+</Styles>