FIxing Visibility Updating Bug

[Jatin24062005]

Issue:

Fixes #3864
CHANGE_VISIBILITY was attempting to call .map() on the sketches state object instead of the projects array, causing the reducer to error and preventing the UI from updating.

Demo:

Changes:

Updated the CHANGE_VISIBILITY case in the sketches reducer to:

• Operate on state.projects instead of state
• Return a new state object with an updated projects array

This ensures the Redux state slice that the Sketches list subscribes to actually changes.

I have verified that this pull request:

• has no linting errors (npm run lint)
• has no test errors (npm run test)
• has no typecheck errors (npm run typecheck)
• is from a uniquely-named feature branch and is up to date with the develop branch.
• is descriptively named and links to an issue number, i.e. Fixes #123
• meets the standards outlined in the accessibility guidelines