xfy c92ba6d648 docs(plan): editor image upload placeholder implementation plan
13 个任务的实现计划,对应 upload-placeholder spec:
- Task 1-3: UploadCoordinator(pending map / runUpload+retry / notifyRust)
- Task 4: 自定义 Image 扩展 + NodeView 类(三种态)
- Task 5-6: index.ts 接线 + slash-command 走 coordinator
- Task 7: NodeView 样式(遮罩/spinner/错误卡片)
- Task 8-12: write.rs(signal/轮询/提示/保存拦截/fetch 改造)
- Task 13: 全量验证(cargo test/clippy/dx check + 手动清单)

每个任务含完整代码、行号、构建/测试命令、commit。
2026-06-22 15:19:01 +08:00
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