Migrate Tailwind styles to design-system package (#5794)

## Summary

Consolidates Tailwind configuration and styles into a shared
`@comfyorg/design-system` package for reuse across monorepo apps.

The goal was not to make changes to how the design system works; merely
to separate it cleanly. I _would_ strongly recommend some drastic
sweeping changes, however I believe that should be done after the
migration.

## Changes

- **What**: Migrates CSS files, Tailwind config, and custom icons to
design-system package
- **Dependencies**: Moves `@iconify-json/lucide` and `@iconify/tailwind`
to design-system package

tailwind.config.ts

@@ -1,28 +1,6 @@
-import lucide from '@iconify-json/lucide/icons.json' with { type: 'json' }
-import { addDynamicIconSelectors } from '@iconify/tailwind'
-
-import { iconCollection } from './build/customIconCollection'
+import baseConfig from '@comfyorg/design-system/tailwind-config'
 
 export default {
-  content: ['./index.html', './src/**/*.{vue,js,ts,jsx,tsx}'],
-
-  safelist: [
-    'icon-[lucide--folder]',
-    'icon-[lucide--package]',
-    'icon-[lucide--image]',
-    'icon-[lucide--video]',
-    'icon-[lucide--box]',
-    'icon-[lucide--audio-waveform]',
-    'icon-[lucide--message-circle]'
-  ],
-
-  plugins: [
-    addDynamicIconSelectors({
-      iconSets: {
-        comfy: iconCollection,
-        lucide
-      },
-      prefix: 'icon'
-    })
-  ]
+  ...baseConfig,
+  content: ['./index.html', './src/**/*.{vue,js,ts,jsx,tsx}']
 }