## Summary
- Move `BackfillNavigationMenuItemTypeCommand` from the 1-19 to the 1-20
upgrade path and split the DB transaction into two phases (data
backfill, then schema changes) to avoid the PostgreSQL error "cannot
ALTER TABLE because it has pending trigger events."
- Fix backfill logic to prefer `OBJECT` over `VIEW` for navigation menu
items that have `targetObjectMetadataId`, and correct already mis-typed
items. Tighten the `CHECK` constraint to enforce `viewId IS NULL` for
`OBJECT` type items.
- On the frontend, force `navigationMenuItems` into `staleEntityKeys`
when the server's `minimalMetadata` response omits the collection hash
(happens when the Redis cache hasn't been warmed after an upgrade),
ensuring the sidebar loads navigation items.
## Test plan
- [ ] Upgrade from 1.18 or 1.19 to 1.20 and verify the migration
completes without errors
- [ ] Verify navigation menu items of type `OBJECT` do not have a
`viewId` set in the database
- [ ] Sign out and sign in — confirm navigation menu items appear in the
sidebar on first load
- [ ] Verify `VIEW`-typed items also appear correctly in the sidebar
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