[BUG] New agent view functionality breaks send to CC

## Bug Description

When using the the new agents view mode, selecting text to send to Claude doesn't result in anything being sent to it. Also, the current file information doesn't get passed through to it either.

## To Reproduce

Steps to reproduce the behavior:

1. Open an agent from the agent view
2. Select text and try to send it to claude code (as)
3. Nothing happens

## Expected Behavior

Claude should receive the filename and line number

## Environment

- Neovim version: 11.6
- Claude Code CLI version: 2.1.140
- OS: Tahoe 26.4.1
- Plugin version: commit 102d835

## Error Messages
None

If applicable, add error messages or logs.

```
Paste any error messages here
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## Additional Context

Add any other context about the problem here.

先在 agent view 中复现该故障，然后跟踪 agent view 中的选择流程和 send-to-Claude 路径，并将其与正常工作的视图进行比较。确认选中的文本已发送，并且 Claude 收到了当前文件名和行号。

由索引模型根据 Issue 内容生成。