feat(ui): (optional) Protect starred images from accidental deletion

[FloeHetling]

Summary

• new settings option: "Protect starred images"
• when protection is enabled, following features will be active:

• there will be impossible to delete an image with star mark. If "Confirm on delete" is enabled, a warning toast will appear on said attempt (silent otherwise)
• upon attempting to use "Delete Board and Images" option, additional confirmation will be issued if said board has at least one image with star mark
• upon attempting to delete a group selected of images, images marked with Star will not be touched and a toast about protection status will be thrown if "Confirm on delete" is enabled (silent otherwise)
• same behavior should be expected from "Delete All Uncategorized Images" option.

Related Issues / Discussions

Following this QoL plan from @hipsterusername (Discord message link)

QA Instructions

Careful. This test implies all of the images can or will be eventually lost. For safety of your artwork, consider using testing environment

• have some images to start test with, 10x should be enough.
• enable the "Protect starred images" option in your app Settings
• mark 2 images, select 3 images, 2 of which are marked and 1 is not. Press the Delete key or use Delete icon in viewer. Expected behavior: one unmarked artwork should be deleted
• create a new board and move those 2 marked images there. Add 1 unmarked image. Attempt to delete that board using "Delete Board and Images" option. Expected behavior: additional confirmation should be issued about deleting the board with starred images. Upon agreeing, the board must be gone with all of 3 images.
• you can test verbosity of alerts on six images that are left. "Confirm on delete" option should warn you if you are attempting to delete a starred image by issuing a toast. Leave at least 2 images - one with the Star mark and one without.
• use "Delete All Uncategorized Images" from "Uncategorized" board context menu. Confirm the deletion. Expected behavior: the starred image should be left untouched.

Checklist

• The PR has a short but descriptive title, suitable for a changelog
• Tests added / updated (if applicable)
• Documentation added / updated (if applicable)
• Updated What's New copy (if doing a release after this PR)

[psychedelicious]

Checking the RTK Query cache to determine if an image is starred will not work reliably. It is possible for starred images to not be in the cache, in which case the protection feature wouldn't work. They would be deleted.

I think this needs to be a backend feature to work properly. Image/board services and deletion endpoints could have a delete_starred: bool = True kwarg. It would make the change a lot simpler too.

[FloeHetling]

closed due to feature is being completely re-done from scratch relying on latest changes