Slice 3: Chat History Review (Polish)

Tinker

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Title *

Project *

Description

## Overview
Add chat transcript review capability for ended sessions. Operators and admins can review past chat conversations.

## Verification (How to test after deployment)
1. View any ended session with chat messages
2. See "Chat History" collapsible section below timeline
3. Expand to see full conversation
4. Messages show participant name, content, and timestamp
5. (Optional) Click export to download transcript

## Implementation Scope

### 1. Session Detail Component Update
Add new collapsible card section:
```haml
.card.bg-base-200.mt-2
  .card-body
    %button.card-title.cursor-pointer{ data-action: "click->ui-animate#toggle" }
      История чата
      %span.badge.badge-sm= @session.support_session_messages.count
    .chat-history{ data-ui-animate-target: "content" }
      - if @session.support_session_messages.any?
        - @session.support_session_messages.chronological.each do |msg|
          .chat{ class: msg.operator? ? 'chat-end' : 'chat-start' }
            .chat-header
              = msg.participant_name
              %time.text-xs.opacity-50= l(msg.created_at, format: :short)
            .chat-bubble{ class: msg.operator? ? 'chat-bubble-primary' : '' }
              = msg.content
      - else
        .text-center.text-base-content.opacity-50.py-4
          Нет сообщений в этой сессии
```

### 2. (Optional) Export Functionality
Add transcript export:
- Plain text format
- JSON format option
- Download via button

```ruby
def export_chat
  @session = SupportSession.find(params[:id])
  authorize! @session, to: :show?, with: RemoteSupportPolicy
  
  messages = @session.support_session_messages.chronological
  
  respond_to do |format|
    format.text { render plain: format_as_text(messages) }
    format.json { render json: messages.map(&:to_broadcast_payload) }
  end
end
```

## Files to Modify
- `app/components/remote_support/session_detail_component.rb` (add messages helper)
- `app/components/remote_support/session_detail_component.html.haml` (add section)
- `app/controllers/remote_support_sessions_controller.rb` (optional export)
- `config/routes.rb` (optional export route)
- `spec/components/remote_support/session_detail_component_spec.rb`