S-09: Openbaar Register portal — public lookup (#76)

Anonymous openbaar portal completing the walking skeleton (submit → projection → public visibility).

closes #10

apps/openbaar/src/app/register/register-page.ts

@@ -0,0 +1,45 @@
+import { Component, inject, signal } from '@angular/core';
+import { FormsModule } from '@angular/forms';
+import { BffApiV1Service, type OpenbaarEntry } from 'api-client';
+import { UtrechtComponentsModule } from 'ui';
+
+/**
+ * The openbaar (public) BIG-register: an anonymous search over the read projection's public-safe
+ * view (id + status only — bsn/naam never leave the BFF; ADR-0010). Loads the full register on open
+ * and filters by the search term via the BFF's `/openbaar/register?q=` endpoint (S-09).
+ */
+@Component({
+  selector: 'app-register-page',
+  imports: [FormsModule, UtrechtComponentsModule],
+  templateUrl: './register-page.html',
+})
+export class RegisterPage {
+  private readonly bff = inject(BffApiV1Service);
+
+  protected readonly query = signal('');
+  protected readonly entries = signal<OpenbaarEntry[]>([]);
+  protected readonly loading = signal(false);
+  protected readonly searched = signal(false);
+
+  constructor() {
+    // Show the full register on open; the search box narrows it.
+    this.search();
+  }
+
+  search(): void {
+    const q = this.query().trim();
+    this.loading.set(true);
+    this.bff.getOpenbaarRegister(q ? { q } : {}).subscribe({
+      next: (rows: OpenbaarEntry[]) => {
+        this.entries.set(rows);
+        this.loading.set(false);
+        this.searched.set(true);
+      },
+      error: () => {
+        this.entries.set([]);
+        this.loading.set(false);
+        this.searched.set(true);
+      },
+    });
+  }
+}