feat(showcase): ADR-0047 — lookup quick-filter example (project)

Adds the project master-detail field to the Task List view's dropdown
filters: the record-picker dropdown path (search + multi-select records)
that CRM consumers (hotcrm account workbench: owner user lookup) rely
on. Browser-verified + covered by objectui e2e (user-filters.spec.ts).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: os-zhuang

examples/app-showcase/src/views/task.view.ts

@@ -75,6 +75,9 @@ export const TaskViews = defineView({
           { field: 'status' },
           { field: 'priority', showCount: true },
           { field: 'done', type: 'boolean' },
+          // Lookup field — renders as a record-picker dropdown (the
+          // CRM-parity case: filter by a referenced record, e.g. owner).
+          { field: 'project' },
         ],
       },
     },