[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.

Written by the indexing model from the issue text.