Add VSCode themes plugin with 30+ popular themes (#336)

Co-authored-by: Claude <noreply@anthropic.com>

plugins/themes-yaak/src/themes/moonlight.ts

@@ -0,0 +1,28 @@
+import type { Theme } from '@yaakapp/api';
+
+export const moonlight: Theme = {
+  id: 'moonlight',
+  label: 'Moonlight',
+  dark: true,
+  base: {
+    surface: 'hsl(234,23%,17%)',
+    text: 'hsl(225,71%,90%)',
+    textSubtle: 'hsl(230,28%,62%)',
+    textSubtlest: 'hsl(232,26%,43%)',
+    primary: 'hsl(262,100%,82%)',
+    secondary: 'hsl(232,18%,65%)',
+    info: 'hsl(217,100%,74%)',
+    success: 'hsl(174,66%,54%)',
+    notice: 'hsl(35,100%,73%)',
+    warning: 'hsl(17,100%,71%)',
+    danger: 'hsl(356,100%,73%)',
+  },
+  components: {
+    appHeader: {
+      surface: 'hsl(233,23%,15%)',
+    },
+    sidebar: {
+      surface: 'hsl(233,23%,15%)',
+    },
+  },
+};