[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.

Start in the BitFun Remote frontend by tracing the Claw icon used in the Assistant entry and comparing it with the session-history row and active-session header. Reuse the existing Claw icon mapping where the history row selects its generic window/card icon, then reproduce the issue in the Assistant section and session history to confirm all three views show the same icon.

索引モデルが issue の本文から書いたものです。