Click colored region annotation for bone or sub-bone in image to select it

Describe the feature that you would like added
A clear and concise description of the feature, and why is should be added to the project.

Currently, when a boneset is selected for viewing, a user must then select a bone from the dropdown menu. After that, they must select a bone part from the dropdown. A more intuitive interface would be for users to be able to click directly on the image, to select a bone and bone part by clicking the color-highlighted are on the image.

Tasks that need to completed for this feature
A list of individual tasks that likely must be done before the feature can be considered "complete".

• Make colored region annotations clickable
• Have clicked colored region annotations select the appropriate bone or bone part from the dropdown

Acceptance Criteria

A checklist of conditions that must be met for this task to be considered complete. How will we verify that it's done correctly?

• The new feature is implemented as described.
• All related code passes the repository's workflow checks (linting, tests).
• The application runs without errors after the changes are made.
• (If applicable) New automated tests have been added to cover the changes.

Additional context
Add any other context or screenshots about the feature request here.

See also #207

Start by tracing the existing boneset, bone, and bone-part dropdowns and the image annotation UI; the issue does not name specific files or tests. Make colored regions clickable so a click selects the matching bone or bone part in the dropdowns, then run the repository workflow checks and verify the application works without errors.