feat(recipes): add RecipeHero component with image/no-image variants

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

frontend/src/lib/recipes/RecipeHero.test.ts

@@ -0,0 +1,66 @@
+import { describe, it, expect } from 'vitest';
+import { render, screen } from '@testing-library/svelte';
+import RecipeHero from './RecipeHero.svelte';
+
+const baseRecipe = {
+	id: 'r1',
+	name: 'Spaghetti Bolognese',
+	serves: 4,
+	cookTimeMin: 30,
+	effort: 'Easy',
+	heroImageUrl: undefined as string | undefined,
+	tags: [] as { id: string; name: string; tagType?: string }[]
+};
+
+describe('RecipeHero', () => {
+	it('renders the recipe name', () => {
+		render(RecipeHero, { props: { recipe: baseRecipe } });
+		expect(screen.getByText('Spaghetti Bolognese')).toBeInTheDocument();
+	});
+
+	it('renders green-tint hero when no image', () => {
+		render(RecipeHero, { props: { recipe: baseRecipe } });
+		const hero = document.querySelector('[data-testid="recipe-hero"]');
+		expect(hero?.className).toContain('bg-[var(--green-tint)]');
+	});
+
+	it('renders image when heroImageUrl is provided', () => {
+		render(RecipeHero, {
+			props: { recipe: { ...baseRecipe, heroImageUrl: '/uploads/pasta.jpg' } }
+		});
+		const img = screen.getByRole('img', { name: /spaghetti bolognese/i });
+		expect(img).toHaveAttribute('src', '/uploads/pasta.jpg');
+	});
+
+	it('renders cook time pill', () => {
+		render(RecipeHero, { props: { recipe: baseRecipe } });
+		expect(screen.getByText(/30 Min/)).toBeInTheDocument();
+	});
+
+	it('renders effort pill', () => {
+		render(RecipeHero, { props: { recipe: baseRecipe } });
+		expect(screen.getByText(/Easy/)).toBeInTheDocument();
+	});
+
+	it('renders serves pill', () => {
+		render(RecipeHero, { props: { recipe: baseRecipe } });
+		expect(screen.getByText(/4/)).toBeInTheDocument();
+	});
+
+	it('renders back link to /recipes', () => {
+		render(RecipeHero, { props: { recipe: baseRecipe } });
+		const backLink = screen.getByRole('link', { name: /zurück/i });
+		expect(backLink).toHaveAttribute('href', '/recipes');
+	});
+
+	it('renders cook now link to /cook/[id]', () => {
+		render(RecipeHero, { props: { recipe: baseRecipe } });
+		const cookLink = screen.getByRole('link', { name: /jetzt kochen/i });
+		expect(cookLink).toHaveAttribute('href', '/cook/r1');
+	});
+
+	it('does not render img when no heroImageUrl', () => {
+		render(RecipeHero, { props: { recipe: baseRecipe } });
+		expect(screen.queryByRole('img')).not.toBeInTheDocument();
+	});
+});