Preserve session target when using Send to New Chat

[Copilot]

Clicking the "Send to New Chat" tip (or Ctrl+Shift+Enter) while in a non-local session (Claude, Cloud, Background) resets the Session Target back to Local. This happens because SendToNewChatAction unconditionally calls widget.clear(), which always creates a new local session.

The fix mirrors the existing pattern in runNewChatAction (chatNewActions.ts): check the current session type from the resource URI scheme, and for non-local sidebar sessions, use view.loadSession() with a new resource of the same type instead of widget.clear().

// Before: always creates a local session
await widget.clear();

// After: preserves session type for non-local sessions
const currentResource = widget.viewModel?.model.sessionResource;
const currentSessionType = currentResource ? getChatSessionType(currentResource) : localChatSessionType;
if (isIChatViewViewContext(widget.viewContext) && currentSessionType !== localChatSessionType) {
    const newResource = URI.from({ scheme: currentSessionType, path: `/untitled-${generateUuid()}` });
    const view = await viewsService.openView(ChatViewId) as ChatViewPane;
    await view.loadSession(newResource);
} else {
    await widget.clear();
}

Original prompt

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This section details on the original issue you should resolve

<issue_title>Create new session tip resets Session Target to Local</issue_title>
<issue_description>
Steps to Reproduce:

1. See tip to Create new session (I forget the exact words)
2. Change Session Target from Local to Claude (or Background or Cloud)
3. Click the link in the tip
4. 🐛 Session Target goes back to Local
   </issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Create new session tip resets Session Target to Local #295071

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