Adds a toggle command in the System category that allows users to enable
or disable saving cleared prompts to history. The feature is disabled by
default to preserve existing behavior.
When enabled via the command palette ("Include cleared prompts in history"),
pressing Ctrl+C will save the current prompt to history before clearing it,
allowing users to navigate back with arrow keys.
The setting persists in kv.json.
Ariane Emory
2c6ff35400