[FEATURE] Custom images as course backgrounds compared to regular colors

[tokkirin]

Pre-submission Checklist

• [✔] I have searched existing issues to ensure this feature hasn't been requested
• [✔] I have searched closed issues to check if this was previously rejected/implemented
• [✔] I have checked the project roadmap (if available) for planned similar features
• [✔] I have reviewed the documentation to confirm this feature doesn't exist
• [✔] I have completed all sections below with detailed information

Feature Description

In addition to the color customization feature, there could be an alternative to customize the course backgrounds for people who prefer images as backgrounds rather than colors. This would be like having a custom image (.jpg, .png, etc) or a .gif as a course cell background.

Proposed Solution

In the color wheel/color bar option, instead of having just color selections, underneath it could be an option to upload custom images to be as the background images for the course cells. That way it would blend in with the rest of the courses and would not hinder with the rest of the course selections.

UI/UX Considerations

It does not involve major UI changes to the base of the extension, rather just a nice customization to the course cells that the user could use, as there is an option to customize Canvas course images, so it is also a good customization to have for the users.

Technical Implementation Details

Implement a button that allows the user to add a custom image and then change the course cell image accordingly with that file.