Insert at Cursor

### Description

Currently, the response from the API populates the entire active tab contents, overwriting anything already present. It would be nice to have a toggle option alongside the "Ask ChatGPT" button that permits the response to "insert", rather than replace. This should insert at the position of the active cursor, or at least, the last place the cursor was selected in that text box, given that browser focus will be in the CHatGT text input, or on the "Ask ChatGPT" button.

### Have you provided an initial effort estimate for this issue?

I have provided an initial effort estimate

Locate the UI code for the "Ask ChatGPT" button and the logic that populates the active tab, then inspect how the text area's cursor or selection is tracked. Done means a toggle allows the response to be inserted at the active cursor or last selection instead of replacing the entire tab contents.

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