Add search publication page and fix category access

frontend/src/app/pages/search-publications/search-publications.component.ts

@@ -0,0 +1,48 @@
+import { CommonModule } from "@angular/common";
+import { Component, inject, OnDestroy, OnInit } from "@angular/core";
+import { MatProgressSpinner } from "@angular/material/progress-spinner";
+import { ActivatedRoute } from "@angular/router";
+import { Observable, Subscription } from "rxjs";
+import { PublicationListComponent } from "../../components/publication-list/publication-list.component";
+import { Publication } from "../../core/rest-services/publications/model/publication";
+import { SearchPublicationsService } from "./search-publications.service";
+
+@Component({
+    selector: 'app-search-publications',
+    templateUrl: './search-publications.component.html',
+    styleUrl: './search-publications.component.scss',
+    standalone: true,
+    imports: [CommonModule, MatProgressSpinner, PublicationListComponent],
+    providers: [SearchPublicationsService]
+})
+export class SearchPublicationsComponent implements OnInit, OnDestroy {
+    private searchPublicationsService = inject(SearchPublicationsService);
+    private activatedRoute = inject(ActivatedRoute);
+    private queryParamsSubscription?: Subscription;
+
+    ngOnInit(): void {
+        this.queryParamsSubscription = this.activatedRoute.queryParamMap
+            .subscribe(params => {  
+                const categoryId = params.get('category-id');
+                if (categoryId) {
+                    this.searchPublicationsService.loadPublications(`category_id=${categoryId}`);
+                }
+            });
+    }
+
+    ngOnDestroy(): void {
+        this.queryParamsSubscription?.unsubscribe();
+    }
+
+    get publications$(): Observable<Publication[]> {
+        return this.searchPublicationsService.publications$;
+    }
+
+    get isLoading$(): Observable<boolean> {
+        return this.searchPublicationsService.isLoading$;
+    }
+
+    get isLoaded$(): Observable<boolean> {
+        return this.searchPublicationsService.isLoaded$;
+    }
+}