feat add processing conversation on desktop

[krushnarout]

[gemini-code-assist]

Code Review

This pull request introduces a widget to display conversations that are currently being processed on the desktop version of the application. The implementation is clean and integrates well with the existing conversation list. I have one suggestion to improve the new widget by making it display dynamic data instead of being a static placeholder, which also resolves an unused parameter issue.

[gemini-code-assist]

This placeholder for the timestamp can be replaced with the actual start time from the conversation object to provide more context about the processing item. This also resolves the issue of the conversation parameter being unused in this widget.

Note: You'll need to add the following import at the top of the file:

import 'package:intl/intl.dart';

Suggested change

	// Timestamp placeholder
	Container(
	width: 60,
	height: 14,
	decoration: BoxDecoration(
	color: ResponsiveHelper.backgroundQuaternary,
	borderRadius: BorderRadius.circular(4),
	),
	),
	// Timestamp
	Text(
	DateFormat.jm(Localizations.localeOf(context).languageCode)
	.format(conversation.startedAt ?? conversation.createdAt),
	style: const TextStyle(
	color: ResponsiveHelper.textTertiary,
	fontSize: 13,
	fontWeight: FontWeight.w500,
	),
	),