fix(agent): 附件上传串行化修并发覆盖丢附件

[Rely-xcy]

概述

• 现象：附件上传中再次上传，先选文件的预览丢失（但文件已上传成功）。
• 根因：pendingAttachments = pendingAttachments + uploaded 是读-改-写，两次上传并发时后写覆盖前写。
• 修复：handlePickedAttachments 用 Mutex 串行化上传流程。
• 顺带：待发送附件缩略图区保持横向滑动，新附件自动滚到最右、立即可见。

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between 7d40c9d and 2fa5ae2.

📒 Files selected for processing (2)

• app/src/main/java/com/aicode/feature/agent/presentation/component/AIChatPanel.kt
• app/src/main/java/com/aicode/feature/agent/presentation/component/ChatInputAttachments.kt

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