Fix custom path matching for site section scope
Follow up to: #3582504 **Description:** The site-section scope supports custom path values such as `custom:/products/*`, but the selection pipeline currently relies on the base scope matching logic, which only compares the detected section ID to stored scope values. As a result, custom path patterns may never match during context selection. **Scope:** - Override `matchesCurrentContext()` in the site-section scope plugin. - Match both configured section IDs and `custom:` path patterns against the current path. - Preserve existing behavior for items with no site-section values. - Add tests for predefined section matching, custom path matching, non-matching paths, and no-current-request behavior. **Acceptance criteria:** - Context items scoped to `custom:` paths are selected when the current path matches. - Existing predefined site-section matching still works. - Items with non-matching site-section restrictions are excluded. - Tests cover wildcard and exact custom path patterns. **AI usage disclosures:** - [x] AI Assisted Issue - [x] AI Generated Code
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