Extract search bar into a standalone component and fix header design.

frontend/src/app/components/publications-search-bar/publications-search-bar.component.html

@@ -0,0 +1,6 @@
+<form [formGroup]="formGroup">
+    <input name="search-query" placeholder="Search something..." formControlName="criteria"/>
+    <button type="submit" (click)="searchPublications()">
+        <mat-icon>search</mat-icon>
+    </button>
+</form>

frontend/src/app/components/publications-search-bar/publications-search-bar.component.scss

@@ -0,0 +1,37 @@
+:host {
+    $borderRadiusValue: 10em;
+    position: relative;
+    flex-direction: row;
+    align-items: center;
+
+    form {
+        display: flex;
+
+        input {
+            flex: 1;
+            border-radius: $borderRadiusValue;
+            background-color: white;
+            border: solid 1px #ddd;
+            padding: .2em 2.7em .2em 1em;
+            height: 2em;
+            width: 100%;
+        }
+    
+        button {
+            position: absolute;
+            display: flex;
+            align-items: center;
+            border-radius: $borderRadiusValue;
+            background-color: white;
+            border: none;
+            top: .4em;
+            right: 0;
+            color: #aaaaaa;
+    
+            &:hover {
+                background-color: #eee;
+                cursor: pointer;
+            }
+        }
+    }
+}

frontend/src/app/components/publications-search-bar/publications-search-bar.component.ts

@@ -0,0 +1,31 @@
+import { HttpParams } from "@angular/common/http";
+import { Component, inject } from "@angular/core";
+import { FormBuilder, FormControl, ReactiveFormsModule, Validators } from "@angular/forms";
+import { MatIconModule } from "@angular/material/icon";
+import { Router } from "@angular/router";
+
+
+@Component({
+    selector: 'app-publications-search-bar',
+    templateUrl: './publications-search-bar.component.html',
+    styleUrl: './publications-search-bar.component.scss',
+    standalone: true,
+    imports: [
+        ReactiveFormsModule,
+        MatIconModule
+    ],
+    providers: []
+})
+export class PublicationsSearchBarComponent {
+    private formBuilder = inject(FormBuilder);
+    private router = inject(Router);
+    formGroup = this.formBuilder.group({
+        criteria: new FormControl<string | undefined>('', [Validators.required])
+    });
+
+    searchPublications(): void {
+        let queryParams = new HttpParams();
+        queryParams = queryParams.set('query', this.formGroup.controls.criteria.value ?? '');
+        this.router.navigate(['/publications'], {queryParams});
+    }
+}

frontend/src/app/components/publications-search-bar/publications-search-bar.service.ts

@@ -0,0 +1,18 @@
+import { HttpParams } from "@angular/common/http";
+import { inject, Injectable } from "@angular/core";
+import { Router } from "@angular/router";
+import { BehaviorSubject } from "rxjs";
+
+@Injectable()
+export class PublicationsSearchBarService {
+    private router = inject(Router);
+    private criteriaSubject = new BehaviorSubject<string>('');
+
+    private cri
+
+    searchPublications(): void {
+        let queryParams = new HttpParams();
+        queryParams = queryParams.set('query', this.criteriaSubject.value);
+        this.router.navigate(['/publications'], {queryParams});
+    }
+}