## Context
Moving isActive filtering to the frontend for page layout tabs and
widgets, hiding inactive entities from the UI while keeping them in
state for future reactivation
Next we will implement deactivated standard tab re-activation during tab
creation (cc @Devessier)
<img width="234" height="303" alt="📋 Menu (Slots)"
src="https://github.com/user-attachments/assets/17a25ac6-55e2-4778-b7f0-e7554ed69704"
/>
## Context
SSE metadata events for overridable entities (viewField, viewFieldGroup,
pageLayoutWidget, pageLayoutTab) were sending raw flat entity data
without resolving overrides into base properties or filtering isActive:
false entities. This caused the frontend to display stale/incorrect
values (e.g., a hidden viewField still appearing visible).
## Implementation
Add a sanitization step in
MetadataEventPublisher.enrichMetadataEventBatch that resolves overrides
and converts isActive transitions into the appropriate event types
(deactivated -> delete, reactivated -> create), matching what GraphQL
resolvers already do
Weiko