Integrate chat panel into GuestKiosk

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Description

## Task
Integrate the `SessionChatPanel` component into the guest's `GuestKiosk` interface.

## Layout Changes
Add collapsible chat panel to guest UI:
```
┌─────────────────────────────────────────┬──────────────┐
│                                         │              │
│         Operator Video                  │   Chat       │
│                                         │   Panel      │
│                                         │   (collapse) │
│           [Self PiP]                    │              │
├─────────────────────────────────────────┴──────────────┤
│     Session info / footer          [Chat] [Mic Check]  │
└────────────────────────────────────────────────────────┘
```

## Integration Points
1. Add chat toggle button (with unread badge) to footer
2. Pass guest token to `SessionChatPanel` for ActionCable auth
3. Prompt for guest name on first message (or use "Guest")
4. Use ActionCable for real-time subscription
5. Handle session ended state gracefully

## Props to Pass
```jsx
<SessionChatPanel
  sessionId={sessionId}
  participantType="guest"
  participantName={guestName || 'Guest'}
  token={guestToken}
  initialMessages={messages}
  isCollapsed={chatCollapsed}
  onToggle={() => setChatCollapsed(!chatCollapsed)}
  disabled={sessionState === 'ended'}
/>
```

## Guest Name Handling
- Store in localStorage for session persistence
- Optional: prompt modal on first message
- Default to translated "Guest" if not provided

## Translations
Add to `app/javascript/i18n/guest/translations.js`:
- `guest.chat.title`
- `guest.chat.placeholder`
- `guest.chat.send`
- `guest.chat.empty`
- `guest.chat.name_prompt`

## Files to Modify
- `app/javascript/components/remote_support/GuestKiosk.jsx`
- `app/javascript/i18n/guest/translations.js`
- `app/views/remote_support_guest/show.html.haml` (pass initial messages if needed)
- `app/controllers/remote_support_guest_controller.rb` (include messages in response)