Fix the camera permission step on Android

An AI wrote Android camera code that called Camera.open() straight away, because the CAMERA permission was declared in the manifest. On a fresh install it crashed with a SecurityException: a manifest entry only asks for a permission, and the user must grant it at runtime. The fix decides the next step from the permission state.

An assistant wrote next_permission_action(manifest_declared, granted, denial_count). It is in the editor. It has a bug. Find it and fix it.

Input and output:

• manifest_declared: CAMERA is declared in the manifest.
• granted: the permission is granted right now.
• denial_count: how many times the user has denied the request.
• Return the next step as a string.

Rules the tests check. Return the first that applies:

1. Not declared in the manifest: declare_in_manifest.
2. Granted: open_camera, whatever the denial count.
3. Denied 2 or more times: open_app_settings. Android stops showing the prompt after the second denial.
4. Denied exactly once: show_rationale.
5. Otherwise, including a negative count: request_permission.