disabled button if no api key.. etc

[aswanth6000]

Here is a list of features I've implemented:

1. API Key Button Management: The button will show "Set API Key to Enable AI" if there is no api key present in the local storage.
2. Loading Animation: Displays a loading animation on the "Save" button while saving the API key.
3. Toast Notifications: Shows success messages upon successfully saving the API key.
4. Extension Reload: Reloads the extension after the API key is saved.
5. Popup Close: Closes the popup once the API key is saved and the page is reloaded.