Allow subcontext scope to override parent scope
## Problem/motivation Follow-up to: #3576092 ## Solution From the other issue: Discussion with Emma+Aidan at UX sync: - Toggle (true/false) is defaulted to "Same as parent" (true) right above Global and then hide all of them - Description: "Disable to customize scope." Here's a [plan from cursor](https://www.drupal.org/files/issues/2026-04-21/subcontext_scope_inheritance_51216439.plan_.md) that can be updated to reflect ^ ## Tasks - [x] Add code - [x] Review code - [ ] Manually test code ## AI usage - [ ] AI assisted issue - [ ] AI assisted code - [x] AI generated code
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