Bug Description:

Task contexts appear duplicated in the task context quick pick.
This occurs when new summaries are generated during the current session. In contrast, contexts loaded on startup are not duplicated.

The black framed contexts (1) were already there on startup, the yellow marked one (2) was just created in this session and is shown duplicated in the quick pick for task contexts.

Steps to Reproduce:

1. Start Theia with existing task contexts and check if they are shown correctly in the task context quick pick.
2. Trigger creation of a task summary
3. Open the task context selector via the "+" button in the AI chat view.
4. Observe that the newly created task summary appears twice in the quick pick list.

Additional Information

• Theia Version: >= 1.62.101