Try fixing chat session content being retained

[mjbvz]

We only want to retain this while the session is ongoing or it's open in a panel/editor. The panel case wdidn't seem to be handling this

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

This PR aims to prevent chat session content from being retained longer than necessary by ensuring contributed “untitled” sessions are properly committed to a real resource and by updating the view pane when such a commit happens.

Changes:

• Wrap contributed-session “commit to real resource” logic in sendRequest and add cleanup via a disposable model reference.
• Emit a “session committed” event during the untitled-to-real session transition.
• Update ChatViewPane to react to committed sessions by reloading and showing the committed model.

Show a summary per file

File	Description
src/vs/workbench/contrib/chat/common/chatService/chatServiceImpl.ts	Introduces a commit flow for untitled contributed sessions and attempts to dispose the temporary model reference to avoid retention.
src/vs/workbench/contrib/chat/browser/widgetHosts/viewPane/chatViewPane.ts	Listens for session-commit events and swaps the pane’s model to the committed session resource.

Copilot's findings

• Files reviewed: 2/2 changed files
• Comments generated: 3