phsl / new-api

- Switch Collapse from controlled (activeKey) to uncontrolled (defaultActiveKey) so user toggling works
- Add a stable key to reset Collapse state when tab/category changes
- Default all panels to collapsed via defaultActiveKey: []
- Preserve Panel itemKey for consistent behavior
- No linter errors introduced

Scope: web/src/components/table/channels/modals/ModelSelectModal.jsx