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Reply composer component for open support tickets, combining a `ChatInput` with file attachment support and a close-ticket confirmation dialog.

## Key Components

### `TicketReplyComposer`

The main exported component. Renders a unified composer layout with:

- **`ChatAttachmentChipStrip`** — staged file chips displayed above the input
- **`ChatInput`** — primary text input with send button; disabled during in-flight uploads or when the support system is down
- **`ChatAttachmentAddButton`** — attachment trigger in the bottom toolbar (hidden when `supportSystemDown`)
- **`Close ticket` button** — opens an `AlertDialog` to confirm closure with an optional resolution note

### `TicketReplyComposerProps`

| Prop | Type | Description |
|---|---|---|
| `ticket` | `AnyTicket` | The ticket being replied to |
| `busy` | `boolean` | Disables input while a send is in progress |
| `supportSystemDown` | `boolean` | Signals connection loss; swaps in a placeholder and hides attachments |
| `onSendMessage` | `TicketDetailDrawerProps['onSendMessage']` | Async send handler; returns `boolean` indicating success |
| `onClose` | `TicketDetailDrawerProps['onClose']` | Async close handler; receives an optional resolution string |

## Usage Example

```typescript
<TicketReplyComposer
  ticket={ticket}
  busy={isSending}
  supportSystemDown={!isConnected}
  onSendMessage={async (ref, text, attachments) => {
    const ok = await sendReply(ref.id, text, attachments)
    return ok
  }}
  onClose={async (ref, resolution) => {
    await closeTicket(ref.id, resolution)
  }}
/>
```

## Behavior Notes

- Draft text and staged files **survive a failed send** — `ChatInput` retains text; attachments are only cleared on success
- Close confirmation uses a **non-destructive accent button** (closing is reversible via Reopen)
- `autoFocus` uses `{ preventScroll: true }` internally, so the drawer's scroll-to-top animation is not interrupted
- The drawer is **not collapsed** after closing a ticket (no `onActionCollapsed`) to preserve the in-place status badge update

## Source

[`ticket-reply-composer.tsx`](https://github.com/flamingo-stack/openframe-oss-lib/blob/main/ticket-reply-composer.tsx)