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

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

plugins/themes-yaak/src/themes/material-darker.ts

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+import type { Theme } from '@yaakapp/api';
+
+export const materialDarker: Theme = {
+  id: 'material-darker',
+  label: 'Material Darker',
+  dark: true,
+  base: {
+    surface: 'hsl(0, 0%, 13%)',
+    surfaceHighlight: 'hsl(0, 0%, 18%)',
+    text: 'hsl(0, 0%, 93%)',
+    textSubtle: 'hsl(0, 0%, 65%)',
+    textSubtlest: 'hsl(0, 0%, 50%)',
+    primary: 'hsl(262, 100%, 75%)',
+    secondary: 'hsl(0, 0%, 60%)',
+    info: 'hsl(224, 100%, 75%)',
+    success: 'hsl(84, 60%, 73%)',
+    notice: 'hsl(43, 100%, 70%)',
+    warning: 'hsl(14, 85%, 70%)',
+    danger: 'hsl(1, 77%, 59%)',
+  },
+  components: {
+    sidebar: {
+      surface: 'hsl(0, 0%, 11%)',
+      border: 'hsl(0, 0%, 16%)',
+    },
+    appHeader: {
+      surface: 'hsl(0, 0%, 9%)',
+      border: 'hsl(0, 0%, 14%)',
+    },
+    button: {
+      primary: 'hsl(262, 100%, 68%)',
+      info: 'hsl(224, 100%, 68%)',
+      success: 'hsl(84, 60%, 66%)',
+      notice: 'hsl(43, 100%, 63%)',
+      warning: 'hsl(14, 85%, 63%)',
+      danger: 'hsl(1, 77%, 52%)',
+    },
+  },
+};