Warning when the user tries to save an image to inappropriate formats

[yauhen-karmyzau]

As a User, I want to receive a warning when I try to save an image to inappropriate or unsupported formats, so that I can avoid data loss or corruption and ensure the integrity of my chemical structure diagrams.

Acceptance Criteria:

1. When a user attempts to save an image to an inappropriate or unsupported format, the application should display a warning message.

2. The warning message should clearly inform the user that the chosen format is inappropriate or unsupported, and may result in data loss or corruption.
3. 3. The warning message should suggest appropriate or supported formats for saving the image.
4. If the user chooses to proceed despite the warning, the application should attempt to save the image to the chosen format, but handle any errors gracefully and provide clear error messages.

[ivanmaslow]

Allowed Formats: Ket, SVG, PNG, CDXML, BASE64 CDX, CDX.