Add chat history review in session detail view

Tinker

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Description

## Task
Add a chat history review interface for operators and admins to view chat transcripts after a session has ended.

## UI Location
In `SessionDetailComponent`, add a collapsible section (similar to timeline) showing chat history:

```haml
.card.bg-base-200
  .card-body
    %button.card-title История чата
    .chat-history
      - @session.support_session_messages.chronological.each do |msg|
        .chat{ class: msg.operator? ? 'chat-end' : 'chat-start' }
          .chat-header= msg.participant_name
          .chat-bubble= msg.content
          %time= msg.created_at
```

## Features
1. **Chronological Display**: Messages in order with timestamps
2. **Participant Distinction**: Visual difference between operator/guest messages
3. **Collapsible**: Collapsed by default, expandable
4. **Empty State**: "No messages in this session" if empty

## Optional Enhancement
- Download transcript button (plain text or JSON export)
- Filter by participant

## Files to Modify
- `app/components/remote_support/session_detail_component.rb`
- `app/components/remote_support/session_detail_component.html.haml`
- `spec/components/remote_support/session_detail_component_spec.rb`