Create Avatar component

webui/src/common/components/Avatar/Avatar.jsx

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+import React from 'react';
+import './styles.sass';
+
+export const Avatar = ({
+  children,
+  size = 'md',
+  variant = 'default',
+  className = '',
+  ...rest
+}) => {
+  const avatarClasses = [
+    'avatar',
+    `avatar--${size}`,
+    `avatar--${variant}`,
+    className
+  ].filter(Boolean).join(' ');
+
+  return (
+    <div className={avatarClasses} {...rest}>
+      {children}
+    </div>
+  );
+};

webui/src/common/components/Avatar/index.js

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+export { Avatar as default } from './Avatar.jsx';

webui/src/common/components/Avatar/styles.sass

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+.avatar
+  background: var(--bg-elev)
+  border: 1px solid var(--border)
+  border-radius: 50%
+  display: flex
+  align-items: center
+  justify-content: center
+  color: var(--text-dim)
+  flex-shrink: 0
+  
+  &--sm
+    width: 32px
+    height: 32px
+  
+  &--md
+    width: 48px
+    height: 48px
+  
+  &--lg
+    width: 64px
+    height: 64px
+  
+  &--xl
+    width: 80px
+    height: 80px
+  
+  &--primary
+    background: var(--accent)
+    color: white
+    border-color: var(--accent)
+  
+  &--success
+    background: #16a34a
+    color: white
+    border-color: #16a34a