[Spec Kit] Implementation progress

Implements all 88 tasks for the Reaction Image Board (specs/001-reaction-image-board):

- docker-compose.yml: postgres, minio, minio-init, api, ui services with healthchecks
- api/: FastAPI app with SQLAlchemy 2.x async, Alembic migrations, S3/MinIO storage,
  full integration + unit test suite (pytest + pytest-asyncio)
- ui/: Angular 19 standalone app (Library, Upload, Detail, NotFound components)
- .env.example: all required environment variables
- .gitignore: Python, Node, Docker, IDE, .env patterns

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

ui/src/app/app.component.spec.ts

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+import { TestBed } from '@angular/core/testing';
+import { AppComponent } from './app.component';
+import { provideRouter } from '@angular/router';
+import { routes } from './app.routes';
+
+describe('AppComponent', () => {
+  beforeEach(async () => {
+    await TestBed.configureTestingModule({
+      imports: [AppComponent],
+      providers: [provideRouter(routes)],
+    }).compileComponents();
+  });
+
+  it('should create the app', () => {
+    const fixture = TestBed.createComponent(AppComponent);
+    const app = fixture.componentInstance;
+    expect(app).toBeTruthy();
+  });
+
+  it('should have title reactbin-ui', () => {
+    const fixture = TestBed.createComponent(AppComponent);
+    const app = fixture.componentInstance;
+    expect(app.title).toEqual('reactbin-ui');
+  });
+});

ui/src/app/app.component.ts

@@ -0,0 +1,12 @@
+import { Component } from '@angular/core';
+import { RouterOutlet } from '@angular/router';
+
+@Component({
+  selector: 'app-root',
+  standalone: true,
+  imports: [RouterOutlet],
+  template: `<router-outlet />`,
+})
+export class AppComponent {
+  title = 'reactbin-ui';
+}

ui/src/app/app.config.ts

@@ -0,0 +1,13 @@
+import { ApplicationConfig, provideZoneChangeDetection } from '@angular/core';
+import { provideRouter } from '@angular/router';
+import { provideHttpClient } from '@angular/common/http';
+
+import { routes } from './app.routes';
+
+export const appConfig: ApplicationConfig = {
+  providers: [
+    provideZoneChangeDetection({ eventCoalescing: true }),
+    provideRouter(routes),
+    provideHttpClient(),
+  ],
+};

ui/src/app/app.routes.ts

@@ -0,0 +1,24 @@
+import { Routes } from '@angular/router';
+
+export const routes: Routes = [
+  {
+    path: '',
+    loadComponent: () =>
+      import('./library/library.component').then((m) => m.LibraryComponent),
+  },
+  {
+    path: 'upload',
+    loadComponent: () =>
+      import('./upload/upload.component').then((m) => m.UploadComponent),
+  },
+  {
+    path: 'images/:id',
+    loadComponent: () =>
+      import('./detail/detail.component').then((m) => m.DetailComponent),
+  },
+  {
+    path: '**',
+    loadComponent: () =>
+      import('./not-found/not-found.component').then((m) => m.NotFoundComponent),
+  },
+];

ui/src/app/detail/detail.component.spec.ts

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+import { TestBed } from '@angular/core/testing';
+import { ActivatedRoute, provideRouter, Router } from '@angular/router';
+import { provideHttpClient } from '@angular/common/http';
+import { provideHttpClientTesting } from '@angular/common/http/testing';
+import { of } from 'rxjs';
+import { DetailComponent } from './detail.component';
+import { ImageService } from '../services/image.service';
+import { routes } from '../app.routes';
+
+const MOCK_IMAGE = {
+  id: 'img-1',
+  hash: 'abc',
+  filename: 'test.jpg',
+  mime_type: 'image/jpeg',
+  size_bytes: 100,
+  width: 10,
+  height: 10,
+  storage_key: 'abc',
+  created_at: '2026-01-01T00:00:00Z',
+  tags: ['cat', 'funny'],
+};
+
+describe('DetailComponent', () => {
+  function setup(imageId = 'img-1') {
+    TestBed.configureTestingModule({
+      imports: [DetailComponent],
+      providers: [
+        provideHttpClient(),
+        provideHttpClientTesting(),
+        provideRouter(routes),
+        { provide: ActivatedRoute, useValue: { snapshot: { paramMap: { get: () => imageId } } } },
+      ],
+    }).compileComponents();
+    const fixture = TestBed.createComponent(DetailComponent);
+    const component = fixture.componentInstance;
+    const imgSvc = TestBed.inject(ImageService);
+    spyOn(imgSvc, 'get').and.returnValue(of(MOCK_IMAGE));
+    fixture.detectChanges();
+    return { fixture, component, imgSvc };
+  }
+
+  it('should call PATCH with removed tag absent when chip × is clicked', () => {
+    const { component, imgSvc } = setup();
+    spyOn(imgSvc, 'updateTags').and.returnValue(of({ ...MOCK_IMAGE, tags: ['funny'] }));
+    component.removeTag('cat');
+    expect(imgSvc.updateTags).toHaveBeenCalledWith('img-1', ['funny']);
+  });
+
+  it('should call PATCH with new tag included on addTag', () => {
+    const { component, imgSvc } = setup();
+    spyOn(imgSvc, 'updateTags').and.returnValue(of({ ...MOCK_IMAGE, tags: ['cat', 'funny', 'new'] }));
+    component.addTag('new');
+    expect(imgSvc.updateTags).toHaveBeenCalledWith('img-1', ['cat', 'funny', 'new']);
+  });
+
+  it('should call DELETE and navigate to library on confirm delete', () => {
+    const { component, imgSvc } = setup();
+    const router = TestBed.inject(Router);
+    spyOn(router, 'navigate');
+    spyOn(imgSvc, 'delete').and.returnValue(of(undefined));
+    component.confirmDelete();
+    expect(imgSvc.delete).toHaveBeenCalledWith('img-1');
+    expect(router.navigate).toHaveBeenCalledWith(['/']);
+  });
+
+  it('should NOT call DELETE when cancel is clicked', () => {
+    const { component, imgSvc } = setup();
+    spyOn(imgSvc, 'delete').and.returnValue(of(undefined));
+    component.showDeleteDialog = true;
+    component.cancelDelete();
+    expect(imgSvc.delete).not.toHaveBeenCalled();
+    expect(component.showDeleteDialog).toBeFalse();
+  });
+
+  it('back button should navigate to library', () => {
+    const { component } = setup();
+    const router = TestBed.inject(Router);
+    spyOn(router, 'navigate');
+    component.goBack();
+    expect(router.navigate).toHaveBeenCalledWith(['/']);
+  });
+});

ui/src/app/detail/detail.component.ts

@@ -0,0 +1,128 @@
+import { Component, OnInit, ChangeDetectionStrategy, ChangeDetectorRef } from '@angular/core';
+import { CommonModule } from '@angular/common';
+import { FormsModule } from '@angular/forms';
+import { ActivatedRoute, Router } from '@angular/router';
+import { ImageRecord, ImageService } from '../services/image.service';
+
+@Component({
+  selector: 'app-detail',
+  standalone: true,
+  imports: [CommonModule, FormsModule],
+  changeDetection: ChangeDetectionStrategy.OnPush,
+  template: `
+    <div class="detail-page" *ngIf="image">
+      <button class="back-btn" (click)="goBack()">← Back</button>
+      <h2>{{ image.filename }}</h2>
+
+      <img class="full-image" [src]="imageService.getFileUrl(image.id)" [alt]="image.filename" />
+
+      <section class="tags-section">
+        <h3>Tags</h3>
+        <div class="chips">
+          <span *ngFor="let tag of image.tags" class="chip">
+            {{ tag }} <button (click)="removeTag(tag)">×</button>
+          </span>
+        </div>
+        <div class="add-tag">
+          <input
+            [(ngModel)]="newTagInput"
+            placeholder="Add tag…"
+            (keydown.enter)="onEnter()"
+            (blur)="onBlur()"
+          />
+        </div>
+        <p class="tag-error" *ngIf="tagError">{{ tagError }}</p>
+      </section>
+
+      <button class="delete-btn" (click)="showDeleteDialog = true">Delete Image</button>
+
+      <div class="dialog-overlay" *ngIf="showDeleteDialog">
+        <div class="dialog">
+          <p>Permanently delete this image?</p>
+          <button (click)="confirmDelete()">Delete</button>
+          <button (click)="cancelDelete()">Cancel</button>
+        </div>
+      </div>
+    </div>
+
+    <p *ngIf="!image && !loading" class="not-found">Image not found.</p>
+  `,
+  styles: [`
+    .detail-page { max-width: 900px; margin: 32px auto; padding: 0 16px; }
+    .back-btn { background: none; border: none; color: #4a9eff; cursor: pointer; font-size: 1rem; margin-bottom: 16px; padding: 0; }
+    .full-image { width: 100%; max-height: 70vh; object-fit: contain; background: #111; border-radius: 8px; display: block; }
+    .tags-section { margin-top: 24px; }
+    .chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0; }
+    .chip { background: #333; padding: 4px 12px; border-radius: 14px; display: flex; align-items: center; gap: 6px; }
+    .chip button { background: none; border: none; color: #aaa; cursor: pointer; font-size: 1rem; }
+    .add-tag input { padding: 8px; background: #1a1a1a; border: 1px solid #444; color: #e0e0e0; border-radius: 4px; width: 200px; }
+    .tag-error { color: #ff6b6b; font-size: 0.85rem; margin-top: 6px; }
+    .delete-btn { margin-top: 32px; padding: 10px 24px; background: #c0392b; color: #fff; border: none; border-radius: 6px; cursor: pointer; }
+    .dialog-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.7); display: flex; align-items: center; justify-content: center; z-index: 100; }
+    .dialog { background: #1a1a1a; padding: 32px; border-radius: 10px; text-align: center; }
+    .dialog button { margin: 0 8px; padding: 8px 20px; border: none; border-radius: 6px; cursor: pointer; }
+    .dialog button:first-of-type { background: #c0392b; color: #fff; }
+    .dialog button:last-of-type { background: #444; color: #e0e0e0; }
+    .not-found { text-align: center; color: #666; padding: 60px; }
+  `],
+})
+export class DetailComponent implements OnInit {
+  image: ImageRecord | null = null;
+  loading = true;
+  newTagInput = '';
+  tagError = '';
+  showDeleteDialog = false;
+
+  constructor(
+    public imageService: ImageService,
+    private route: ActivatedRoute,
+    public router: Router,
+    private cdr: ChangeDetectorRef,
+  ) {}
+
+  ngOnInit(): void {
+    const id = this.route.snapshot.paramMap.get('id');
+    if (!id) { this.loading = false; return; }
+    this.imageService.get(id).subscribe({
+      next: (img) => { this.image = img; this.loading = false; this.cdr.markForCheck(); },
+      error: () => { this.loading = false; this.cdr.markForCheck(); },
+    });
+  }
+
+  removeTag(tag: string): void {
+    if (!this.image) return;
+    const updated = this.image.tags.filter((t) => t !== tag);
+    this.imageService.updateTags(this.image.id, updated).subscribe({
+      next: (img) => { this.image = img; this.tagError = ''; this.cdr.markForCheck(); },
+      error: (err) => { this.tagError = err?.error?.detail ?? 'Failed to remove tag'; this.cdr.markForCheck(); },
+    });
+  }
+
+  addTag(tag: string): void {
+    if (!this.image || !tag.trim()) return;
+    const normalised = tag.trim().toLowerCase();
+    const updated = [...this.image.tags, normalised];
+    this.imageService.updateTags(this.image.id, updated).subscribe({
+      next: (img) => { this.image = img; this.newTagInput = ''; this.tagError = ''; this.cdr.markForCheck(); },
+      error: (err) => { this.tagError = err?.error?.detail ?? 'Invalid tag'; this.cdr.markForCheck(); },
+    });
+  }
+
+  onEnter(): void { this.addTag(this.newTagInput); }
+  onBlur(): void { if (this.newTagInput.trim()) this.addTag(this.newTagInput); }
+
+  confirmDelete(): void {
+    if (!this.image) return;
+    this.imageService.delete(this.image.id).subscribe({
+      next: () => this.router.navigate(['/']),
+      error: () => { this.showDeleteDialog = false; this.cdr.markForCheck(); },
+    });
+  }
+
+  cancelDelete(): void {
+    this.showDeleteDialog = false;
+    this.cdr.markForCheck();
+  }
+
+  goBack(): void { this.router.navigate(['/']); }
+}

ui/src/app/library/library.component.spec.ts

@@ -0,0 +1,49 @@
+import { TestBed } from '@angular/core/testing';
+import { provideRouter } from '@angular/router';
+import { provideHttpClient } from '@angular/common/http';
+import { provideHttpClientTesting, HttpTestingController } from '@angular/common/http/testing';
+import { of } from 'rxjs';
+import { LibraryComponent } from './library.component';
+import { ImageService } from '../services/image.service';
+import { routes } from '../app.routes';
+
+describe('LibraryComponent', () => {
+  beforeEach(async () => {
+    await TestBed.configureTestingModule({
+      imports: [LibraryComponent],
+      providers: [provideHttpClient(), provideHttpClientTesting(), provideRouter(routes)],
+    }).compileComponents();
+  });
+
+  it('should render image grid from service response', () => {
+    const fixture = TestBed.createComponent(LibraryComponent);
+    const component = fixture.componentInstance;
+    const imgSvc = TestBed.inject(ImageService);
+    spyOn(imgSvc, 'list').and.returnValue(
+      of({
+        items: [
+          { id: '1', filename: 'a.jpg', tags: ['cat'], hash: '', mime_type: 'image/jpeg', size_bytes: 1, width: 1, height: 1, storage_key: '', created_at: '' },
+        ],
+        total: 1,
+        limit: 50,
+        offset: 0,
+      })
+    );
+    fixture.detectChanges();
+    const de = fixture.nativeElement as HTMLElement;
+    expect(de.querySelectorAll('.image-card').length).toBe(1);
+  });
+
+  it('should trigger new API call with tags param on filter change', () => {
+    const fixture = TestBed.createComponent(LibraryComponent);
+    const component = fixture.componentInstance;
+    const imgSvc = TestBed.inject(ImageService);
+    const listSpy = spyOn(imgSvc, 'list').and.returnValue(
+      of({ items: [], total: 0, limit: 50, offset: 0 })
+    );
+    fixture.detectChanges();
+
+    component.applyFilter(['cat', 'funny']);
+    expect(listSpy).toHaveBeenCalledWith(['cat', 'funny'], jasmine.any(Number), jasmine.any(Number));
+  });
+});

ui/src/app/library/library.component.ts

@@ -0,0 +1,156 @@
+import {
+  Component,
+  OnInit,
+  ChangeDetectionStrategy,
+  ChangeDetectorRef,
+} from '@angular/core';
+import { CommonModule } from '@angular/common';
+import { Router } from '@angular/router';
+import { Subject, debounceTime, distinctUntilChanged } from 'rxjs';
+import { ImageRecord, ImageService } from '../services/image.service';
+import { TagService } from '../services/tag.service';
+
+@Component({
+  selector: 'app-library',
+  standalone: true,
+  imports: [CommonModule],
+  changeDetection: ChangeDetectionStrategy.OnPush,
+  template: `
+    <div class="library">
+      <header>
+        <h1>Reactbin</h1>
+        <button class="upload-btn" (click)="router.navigate(['/upload'])">Upload</button>
+      </header>
+
+      <div class="filter-bar">
+        <input
+          placeholder="Filter by tag…"
+          (input)="onTagInput($event)"
+          [value]="tagSearch"
+        />
+        <div class="chips">
+          <span *ngFor="let tag of activeFilters" class="chip">
+            {{ tag }} <button (click)="removeFilter(tag)">×</button>
+          </span>
+        </div>
+        <ul class="suggestions" *ngIf="suggestions.length">
+          <li *ngFor="let s of suggestions" (click)="addFilter(s.name)">{{ s.name }} ({{ s.image_count }})</li>
+        </ul>
+      </div>
+
+      <div *ngIf="images.length === 0 && !loading" class="empty-state">
+        <p>{{ activeFilters.length ? 'No images match these filters.' : 'No images yet. Upload your first!' }}</p>
+      </div>
+
+      <div class="grid">
+        <div
+          *ngFor="let img of images"
+          class="image-card"
+          (click)="router.navigate(['/images', img.id])"
+        >
+          <img [src]="imageService.getFileUrl(img.id)" [alt]="img.filename" loading="lazy" />
+          <div class="tag-row">
+            <span *ngFor="let tag of img.tags" class="chip small">{{ tag }}</span>
+          </div>
+        </div>
+      </div>
+
+      <button *ngIf="hasMore" class="load-more" (click)="loadMore()">Load more</button>
+    </div>
+  `,
+  styles: [`
+    .library { max-width: 1200px; margin: 0 auto; padding: 24px 16px; }
+    header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; }
+    .upload-btn { padding: 8px 20px; background: #4a9eff; color: #000; border: none; border-radius: 6px; cursor: pointer; font-weight: 600; }
+    .filter-bar { position: relative; margin-bottom: 24px; }
+    .filter-bar input { width: 100%; padding: 10px; background: #1a1a1a; border: 1px solid #444; color: #e0e0e0; border-radius: 6px; }
+    .chips { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 8px; }
+    .chip { background: #333; padding: 3px 10px; border-radius: 12px; font-size: 0.85rem; display: flex; align-items: center; gap: 4px; }
+    .chip.small { font-size: 0.75rem; padding: 2px 8px; }
+    .chip button { background: none; border: none; color: #aaa; cursor: pointer; padding: 0; font-size: 1rem; }
+    .suggestions { position: absolute; z-index: 10; background: #1a1a1a; border: 1px solid #444; list-style: none; width: 100%; max-height: 200px; overflow-y: auto; border-radius: 0 0 6px 6px; }
+    .suggestions li { padding: 8px 12px; cursor: pointer; }
+    .suggestions li:hover { background: #2a2a2a; }
+    .grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 12px; }
+    .image-card { cursor: pointer; background: #1a1a1a; border-radius: 8px; overflow: hidden; }
+    .image-card img { width: 100%; height: 160px; object-fit: cover; display: block; }
+    .tag-row { padding: 6px; display: flex; flex-wrap: wrap; gap: 4px; }
+    .empty-state { text-align: center; padding: 60px 0; color: #666; }
+    .load-more { display: block; margin: 24px auto; padding: 10px 32px; background: #2a2a2a; color: #e0e0e0; border: 1px solid #444; border-radius: 6px; cursor: pointer; }
+  `],
+})
+export class LibraryComponent implements OnInit {
+  images: ImageRecord[] = [];
+  activeFilters: string[] = [];
+  tagSearch = '';
+  suggestions: { name: string; image_count: number }[] = [];
+  loading = false;
+  hasMore = false;
+  private offset = 0;
+  private readonly limit = 50;
+  private readonly filterChange$ = new Subject<string>();
+
+  constructor(
+    public imageService: ImageService,
+    private tagService: TagService,
+    public router: Router,
+    private cdr: ChangeDetectorRef,
+  ) {}
+
+  ngOnInit(): void {
+    this.loadImages();
+    this.filterChange$.pipe(debounceTime(300), distinctUntilChanged()).subscribe((q) => {
+      if (q) {
+        this.tagService.list(q, 10).subscribe((r) => {
+          this.suggestions = r.items;
+          this.cdr.markForCheck();
+        });
+      } else {
+        this.suggestions = [];
+        this.cdr.markForCheck();
+      }
+    });
+  }
+
+  onTagInput(event: Event): void {
+    const val = (event.target as HTMLInputElement).value;
+    this.tagSearch = val;
+    this.filterChange$.next(val);
+  }
+
+  addFilter(tag: string): void {
+    if (!this.activeFilters.includes(tag)) {
+      this.activeFilters = [...this.activeFilters, tag];
+    }
+    this.tagSearch = '';
+    this.suggestions = [];
+    this.applyFilter(this.activeFilters);
+  }
+
+  removeFilter(tag: string): void {
+    this.activeFilters = this.activeFilters.filter((t) => t !== tag);
+    this.applyFilter(this.activeFilters);
+  }
+
+  applyFilter(tags: string[]): void {
+    this.activeFilters = tags;
+    this.offset = 0;
+    this.images = [];
+    this.loadImages();
+  }
+
+  loadImages(): void {
+    this.loading = true;
+    this.imageService.list(this.activeFilters, this.limit, this.offset).subscribe((res) => {
+      this.images = [...this.images, ...res.items];
+      this.offset += res.items.length;
+      this.hasMore = this.offset < res.total;
+      this.loading = false;
+      this.cdr.markForCheck();
+    });
+  }
+
+  loadMore(): void {
+    this.loadImages();
+  }
+}

ui/src/app/not-found/not-found.component.ts

@@ -0,0 +1,16 @@
+import { Component } from '@angular/core';
+import { RouterLink } from '@angular/router';
+
+@Component({
+  selector: 'app-not-found',
+  standalone: true,
+  imports: [RouterLink],
+  template: `
+    <div class="not-found">
+      <h2>404 — Page not found</h2>
+      <a routerLink="/">Back to library</a>
+    </div>
+  `,
+  styles: [`.not-found { text-align: center; padding: 80px 16px; } a { color: #4a9eff; }`],
+})
+export class NotFoundComponent {}

ui/src/app/services/image.service.spec.ts

@@ -0,0 +1,41 @@
+import { TestBed } from '@angular/core/testing';
+import { HttpTestingController, provideHttpClientTesting } from '@angular/common/http/testing';
+import { provideHttpClient } from '@angular/common/http';
+import { ImageService } from './image.service';
+
+describe('ImageService', () => {
+  let service: ImageService;
+  let httpMock: HttpTestingController;
+
+  beforeEach(() => {
+    TestBed.configureTestingModule({
+      providers: [ImageService, provideHttpClient(), provideHttpClientTesting()],
+    });
+    service = TestBed.inject(ImageService);
+    httpMock = TestBed.inject(HttpTestingController);
+  });
+
+  afterEach(() => httpMock.verify());
+
+  it('should include tags query param when filter is set', () => {
+    service.list(['cat', 'funny'], 50, 0).subscribe();
+    const req = httpMock.expectOne((r) => r.url === '/api/v1/images');
+    expect(req.request.params.get('tags')).toBe('cat,funny');
+    req.flush({ items: [], total: 0, limit: 50, offset: 0 });
+  });
+
+  it('should omit tags query param when filter is empty', () => {
+    service.list([], 50, 0).subscribe();
+    const req = httpMock.expectOne((r) => r.url === '/api/v1/images');
+    expect(req.request.params.has('tags')).toBeFalse();
+    req.flush({ items: [], total: 0, limit: 50, offset: 0 });
+  });
+
+  it('should send correct offset and limit params', () => {
+    service.list([], 25, 75).subscribe();
+    const req = httpMock.expectOne((r) => r.url === '/api/v1/images');
+    expect(req.request.params.get('limit')).toBe('25');
+    expect(req.request.params.get('offset')).toBe('75');
+    req.flush({ items: [], total: 0, limit: 25, offset: 75 });
+  });
+});

ui/src/app/services/image.service.ts

@@ -0,0 +1,64 @@
+import { Injectable } from '@angular/core';
+import { HttpClient, HttpParams } from '@angular/common/http';
+import { Observable } from 'rxjs';
+
+export interface ImageRecord {
+  id: string;
+  hash: string;
+  filename: string;
+  mime_type: string;
+  size_bytes: number;
+  width: number;
+  height: number;
+  storage_key: string;
+  created_at: string;
+  tags: string[];
+  duplicate?: boolean;
+}
+
+export interface ImageListResponse {
+  items: ImageRecord[];
+  total: number;
+  limit: number;
+  offset: number;
+}
+
+@Injectable({ providedIn: 'root' })
+export class ImageService {
+  private readonly base = '/api/v1';
+
+  constructor(private http: HttpClient) {}
+
+  upload(file: File, tags: string[]): Observable<ImageRecord> {
+    const form = new FormData();
+    form.append('file', file);
+    if (tags.length) {
+      form.append('tags', tags.join(','));
+    }
+    return this.http.post<ImageRecord>(`${this.base}/images`, form);
+  }
+
+  list(tagFilter: string[] = [], limit = 50, offset = 0): Observable<ImageListResponse> {
+    let params = new HttpParams().set('limit', limit).set('offset', offset);
+    if (tagFilter.length) {
+      params = params.set('tags', tagFilter.join(','));
+    }
+    return this.http.get<ImageListResponse>(`${this.base}/images`, { params });
+  }
+
+  get(id: string): Observable<ImageRecord> {
+    return this.http.get<ImageRecord>(`${this.base}/images/${id}`);
+  }
+
+  getFileUrl(id: string): string {
+    return `${this.base}/images/${id}/file`;
+  }
+
+  updateTags(id: string, tags: string[]): Observable<ImageRecord> {
+    return this.http.patch<ImageRecord>(`${this.base}/images/${id}/tags`, { tags });
+  }
+
+  delete(id: string): Observable<void> {
+    return this.http.delete<void>(`${this.base}/images/${id}`);
+  }
+}

ui/src/app/services/tag.service.spec.ts

@@ -0,0 +1,33 @@
+import { TestBed } from '@angular/core/testing';
+import { HttpTestingController, provideHttpClientTesting } from '@angular/common/http/testing';
+import { provideHttpClient } from '@angular/common/http';
+import { TagService } from './tag.service';
+
+describe('TagService', () => {
+  let service: TagService;
+  let httpMock: HttpTestingController;
+
+  beforeEach(() => {
+    TestBed.configureTestingModule({
+      providers: [TagService, provideHttpClient(), provideHttpClientTesting()],
+    });
+    service = TestBed.inject(TagService);
+    httpMock = TestBed.inject(HttpTestingController);
+  });
+
+  afterEach(() => httpMock.verify());
+
+  it('should include q param when prefix is provided', () => {
+    service.list('cat').subscribe();
+    const req = httpMock.expectOne((r) => r.url === '/api/v1/tags');
+    expect(req.request.params.get('q')).toBe('cat');
+    req.flush({ items: [], total: 0, limit: 100, offset: 0 });
+  });
+
+  it('should omit q param when prefix is empty', () => {
+    service.list().subscribe();
+    const req = httpMock.expectOne((r) => r.url === '/api/v1/tags');
+    expect(req.request.params.has('q')).toBeFalse();
+    req.flush({ items: [], total: 0, limit: 100, offset: 0 });
+  });
+});

ui/src/app/services/tag.service.ts

@@ -0,0 +1,31 @@
+import { Injectable } from '@angular/core';
+import { HttpClient, HttpParams } from '@angular/common/http';
+import { Observable } from 'rxjs';
+
+export interface TagRecord {
+  id: string;
+  name: string;
+  image_count: number;
+}
+
+export interface TagListResponse {
+  items: TagRecord[];
+  total: number;
+  limit: number;
+  offset: number;
+}
+
+@Injectable({ providedIn: 'root' })
+export class TagService {
+  private readonly base = '/api/v1';
+
+  constructor(private http: HttpClient) {}
+
+  list(prefix?: string, limit = 100, offset = 0): Observable<TagListResponse> {
+    let params = new HttpParams().set('limit', limit).set('offset', offset);
+    if (prefix) {
+      params = params.set('q', prefix);
+    }
+    return this.http.get<TagListResponse>(`${this.base}/tags`, { params });
+  }
+}

ui/src/app/upload/upload.component.spec.ts

@@ -0,0 +1,83 @@
+import { TestBed } from '@angular/core/testing';
+import { provideRouter, Router } from '@angular/router';
+import { provideHttpClient } from '@angular/common/http';
+import { provideHttpClientTesting } from '@angular/common/http/testing';
+import { of, throwError } from 'rxjs';
+import { UploadComponent } from './upload.component';
+import { ImageService } from '../services/image.service';
+import { routes } from '../app.routes';
+
+describe('UploadComponent', () => {
+  let component: UploadComponent;
+
+  function makeImageService(overrides: Partial<ImageService> = {}): jasmine.SpyObj<ImageService> {
+    return jasmine.createSpyObj<ImageService>('ImageService', { upload: of({} as any), ...overrides });
+  }
+
+  beforeEach(async () => {
+    await TestBed.configureTestingModule({
+      imports: [UploadComponent],
+      providers: [provideHttpClient(), provideHttpClientTesting(), provideRouter(routes)],
+    }).compileComponents();
+  });
+
+  it('should normalise tag input: lowercases and splits on comma/space', () => {
+    const fixture = TestBed.createComponent(UploadComponent);
+    component = fixture.componentInstance;
+    component.tagInput = 'CAT, Funny reaction';
+    const parsed = component.parseTagInput(component.tagInput);
+    expect(parsed).toEqual(['cat', 'funny', 'reaction']);
+  });
+
+  it('should split on commas', () => {
+    const fixture = TestBed.createComponent(UploadComponent);
+    component = fixture.componentInstance;
+    const parsed = component.parseTagInput('a,b,c');
+    expect(parsed).toEqual(['a', 'b', 'c']);
+  });
+
+  it('should filter empty tokens', () => {
+    const fixture = TestBed.createComponent(UploadComponent);
+    component = fixture.componentInstance;
+    const parsed = component.parseTagInput('  ,, cat ,,');
+    expect(parsed).toEqual(['cat']);
+  });
+
+  it('on duplicate response: shows toast and navigates to detail', async () => {
+    const fixture = TestBed.createComponent(UploadComponent);
+    component = fixture.componentInstance;
+    const router = TestBed.inject(Router);
+    spyOn(router, 'navigate');
+
+    const mockSvc = makeImageService({
+      upload: of({ id: 'abc', duplicate: true } as any),
+    } as any);
+    (component as any).imageService = mockSvc;
+
+    await component.handleUploadResponse({ id: 'abc', duplicate: true } as any);
+    expect(component.toastMessage).toContain('library');
+    expect(router.navigate).toHaveBeenCalledWith(['/images', 'abc']);
+  });
+
+  it('on success response: shows success toast and navigates to detail', async () => {
+    const fixture = TestBed.createComponent(UploadComponent);
+    component = fixture.componentInstance;
+    const router = TestBed.inject(Router);
+    spyOn(router, 'navigate');
+
+    await component.handleUploadResponse({ id: 'xyz', duplicate: false } as any);
+    expect(component.toastMessage).toBeTruthy();
+    expect(router.navigate).toHaveBeenCalledWith(['/images', 'xyz']);
+  });
+
+  it('on error response: shows inline error, no navigation', async () => {
+    const fixture = TestBed.createComponent(UploadComponent);
+    component = fixture.componentInstance;
+    const router = TestBed.inject(Router);
+    spyOn(router, 'navigate');
+
+    component.handleUploadError({ status: 422, error: { detail: 'bad file', code: 'invalid_mime_type' } });
+    expect(component.errorMessage).toBeTruthy();
+    expect(router.navigate).not.toHaveBeenCalled();
+  });
+});

ui/src/app/upload/upload.component.ts

@@ -0,0 +1,133 @@
+import { Component, ChangeDetectionStrategy, ChangeDetectorRef } from '@angular/core';
+import { CommonModule } from '@angular/common';
+import { FormsModule } from '@angular/forms';
+import { Router } from '@angular/router';
+import { ImageRecord, ImageService } from '../services/image.service';
+
+@Component({
+  selector: 'app-upload',
+  standalone: true,
+  imports: [CommonModule, FormsModule],
+  changeDetection: ChangeDetectionStrategy.OnPush,
+  template: `
+    <div class="upload-page">
+      <h1>Upload Image</h1>
+
+      <div
+        class="drop-zone"
+        [class.drag-over]="isDragOver"
+        (dragover)="onDragOver($event)"
+        (dragleave)="isDragOver = false"
+        (drop)="onDrop($event)"
+        (click)="fileInput.click()"
+      >
+        <p>{{ selectedFile ? selectedFile.name : 'Drag & drop or click to browse' }}</p>
+        <input #fileInput type="file" accept="image/*" hidden (change)="onFileChange($event)" />
+      </div>
+
+      <div class="tag-input" *ngIf="selectedFile">
+        <label>Tags (comma or space separated)</label>
+        <input [(ngModel)]="tagInput" placeholder="cat, funny, reaction" />
+        <div class="chips">
+          <span *ngFor="let tag of parseTagInput(tagInput)" class="chip">{{ tag }}</span>
+        </div>
+      </div>
+
+      <button [disabled]="!selectedFile || uploading" (click)="submit()">
+        {{ uploading ? 'Uploading…' : 'Upload' }}
+      </button>
+
+      <p class="toast" *ngIf="toastMessage">{{ toastMessage }}</p>
+      <p class="error" *ngIf="errorMessage">{{ errorMessage }}</p>
+    </div>
+  `,
+  styles: [`
+    .upload-page { max-width: 600px; margin: 40px auto; padding: 0 16px; }
+    .drop-zone { border: 2px dashed #555; border-radius: 8px; padding: 40px; text-align: center; cursor: pointer; }
+    .drop-zone.drag-over { border-color: #fff; background: #1a1a1a; }
+    .tag-input { margin: 16px 0; }
+    label { display: block; margin-bottom: 4px; font-size: 0.9rem; color: #aaa; }
+    input[type=text], input:not([type]) { width: 100%; padding: 8px; background: #1a1a1a; border: 1px solid #444; color: #e0e0e0; border-radius: 4px; }
+    .chips { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 8px; }
+    .chip { background: #333; padding: 2px 10px; border-radius: 12px; font-size: 0.85rem; }
+    button { padding: 10px 24px; background: #4a9eff; color: #000; border: none; border-radius: 6px; cursor: pointer; font-weight: 600; }
+    button:disabled { opacity: 0.5; cursor: default; }
+    .toast { color: #4a9eff; margin-top: 12px; }
+    .error { color: #ff6b6b; margin-top: 12px; }
+  `],
+})
+export class UploadComponent {
+  selectedFile: File | null = null;
+  tagInput = '';
+  uploading = false;
+  toastMessage = '';
+  errorMessage = '';
+  isDragOver = false;
+
+  constructor(
+    private imageService: ImageService,
+    private router: Router,
+    private cdr: ChangeDetectorRef,
+  ) {}
+
+  parseTagInput(input: string): string[] {
+    return input
+      .toLowerCase()
+      .replace(/,/g, ' ')
+      .split(/\s+/)
+      .map((t) => t.trim())
+      .filter((t) => t.length > 0);
+  }
+
+  onDragOver(event: DragEvent): void {
+    event.preventDefault();
+    this.isDragOver = true;
+  }
+
+  onDrop(event: DragEvent): void {
+    event.preventDefault();
+    this.isDragOver = false;
+    const file = event.dataTransfer?.files[0];
+    if (file) this.selectedFile = file;
+  }
+
+  onFileChange(event: Event): void {
+    const input = event.target as HTMLInputElement;
+    this.selectedFile = input.files?.[0] ?? null;
+  }
+
+  submit(): void {
+    if (!this.selectedFile) return;
+    this.uploading = true;
+    this.errorMessage = '';
+    this.toastMessage = '';
+
+    const tags = this.parseTagInput(this.tagInput);
+    this.imageService.upload(this.selectedFile, tags).subscribe({
+      next: (res) => {
+        this.uploading = false;
+        this.handleUploadResponse(res);
+        this.cdr.markForCheck();
+      },
+      error: (err) => {
+        this.uploading = false;
+        this.handleUploadError(err);
+        this.cdr.markForCheck();
+      },
+    });
+  }
+
+  async handleUploadResponse(res: ImageRecord): Promise<void> {
+    if (res.duplicate) {
+      this.toastMessage = 'Already in your library';
+    } else {
+      this.toastMessage = 'Image uploaded successfully!';
+    }
+    await this.router.navigate(['/images', res.id]);
+  }
+
+  handleUploadError(err: any): void {
+    const apiError = err?.error;
+    this.errorMessage = apiError?.detail ?? 'Upload failed. Please try again.';
+  }
+}

ui/src/index.html

@@ -0,0 +1,12 @@
+<!doctype html>
+<html lang="en">
+<head>
+  <meta charset="utf-8">
+  <title>Reactbin</title>
+  <base href="/">
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body>
+  <app-root></app-root>
+</body>
+</html>

ui/src/main.ts

@@ -0,0 +1,5 @@
+import { bootstrapApplication } from '@angular/platform-browser';
+import { AppComponent } from './app/app.component';
+import { appConfig } from './app/app.config';
+
+bootstrapApplication(AppComponent, appConfig).catch((err) => console.error(err));

ui/src/styles.css

@@ -0,0 +1,12 @@
+* {
+  box-sizing: border-box;
+  margin: 0;
+  padding: 0;
+}
+
+body {
+  font-family: system-ui, -apple-system, sans-serif;
+  background: #0f0f0f;
+  color: #e0e0e0;
+  min-height: 100vh;
+}