[Remote] Claw sessions use an inconsistent icon in session history

## Bug
Claw assistant sessions use different icons in different parts of BitFun Remote.

## Expected behavior
The Claw/assistant icon should be consistent in the assistant entry, session history, and active session header.

## Actual behavior
The assistant entry uses the robot-style Claw icon, while Claw sessions in the remote session history are rendered with a generic window/card icon. This makes Claw sessions look like a different session type.

## Reproduction
1. Open BitFun Remote.
2. View the Assistant/Claw section and the session history.
3. Compare the icon for the same Claw session in the assistant entry and in history.

## Environment
- BitFun 0.2.17
- macOS desktop client
- BitFun Remote web UI via relay

## Suggested direction
Reuse the same Claw icon component/mapping for the assistant entry and session-history rows.

从 BitFun Remote 前端开始，追踪 Assistant 条目中使用的 Claw icon，并将其与会话历史行和活动会话标头进行比较。复用历史行在选择通用窗口/卡片图标时使用的现有 Claw icon mapping，然后在 Assistant 部分和会话历史中重现该问题，以确认三个视图显示的是同一个图标。

由索引模型根据 Issue 内容生成。