feat: add Task component for agent progress

[kimteayon]

This is a ...

• New feature
• Bug fix
• Site / documentation improvement
• Demo improvement
• Component style improvement
• TypeScript definition improvement
• Bundle size optimization
• Performance optimization
• Feature enhancement
• Internationalization
• Refactoring
• Code style optimization
• Test Case
• Branch merge
• Workflow
• Accessibility improvement
• Other

Related Issues

N/A

Background and Solution

Add a Task component for representing a single long-running Agent task.

• Support pending, running, completed, failed, and cancelled states.
• Render progress, results, errors, and cancellation reasons.
• Support controlled expansion, custom status/progress/result/error rendering, semantic styles, locale, RTL, theme tokens, and XProvider configuration.
• Replace the temporary task row in the Agent Interaction demo with Task.
• Keep Task scoped to one task entity; ThoughtChain owns planning and AgentTimeline can compose multiple tasks.
• Follow the Agent protocol's 0-1 progress ratio and map directly from AgentTaskState.progress.

Testing

• npm run tsc --workspace packages/x
• Biome checks for the changed files

Jest is currently blocked before test discovery by an incomplete local @ant-design/cssinjs installation (./useStreaming is missing).

Change Log

Language	Changelog
English	Add Task for displaying Agent task status, progress, results, and errors.
Chinese	新增 Task 组件，用于展示 Agent 任务状态、进度、结果和错误信息。

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[codecov]

Bundle Report

Changes will decrease total bundle size by 1.87MB (-34.95%) ⬇️. This is within the configured threshold ✅

Detailed changes

Bundle name	Size	Change
antdx-array-push	2.11MB	-1.87MB (-46.96%) ⬇️

Affected Assets, Files, and Routes:

view changes for bundle: antdx-array-push

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
antdx.min.js (New)	2.11MB	2.11MB	100.0% 🚀
antdx.js (Deleted)	-3.98MB	0 bytes	-100.0% 🗑️

[github-actions]

size-limit report 📦

Path	Size
packages/x/dist/antdx.min.js	512.25 KB (+1.77 KB 🔺)
packages/x-sdk/dist/x-sdk.min.js	62.47 KB
packages/x-markdown/dist/x-markdown.min.js	34.42 KB
packages/x-markdown/dist/plugins/latex.min.js	61.91 KB