feat(V0.2): 列表/看板负责人改为头像 (姓氏首字+按名稳定配色)

src/components/task/TaskCard.jsx

@@ -1,4 +1,5 @@
 import StatusDot from './StatusDot.jsx'
+import Avatar from './Avatar.jsx'
 import { kindColor } from '../../pages/task/kind.js'
 
 // 看板卡片 (T-UI-02): 轻量化
@@ -50,9 +51,7 @@ export default function TaskCard({
             <span className="kind-tag" style={{ background: kindColor(task.kind) }}>{task.kind}</span>
           )}
           <span style={{ display: 'flex', alignItems: 'center', gap: 6, marginLeft: 'auto', minWidth: 0, justifyContent: 'flex-end' }}>
-            <span className={`bassignee${task.assignee ? '' : ' none'}`}>
-              {task.assignee?.name || '未指派'}
-            </span>
+            <Avatar name={task.assignee?.name} size={18} />
             {task.members?.length > 0 && (
               <span className="bmembers">+ {task.members.map((m) => m.name).join('、')}</span>
             )}