feat(detail): link genre and tag chips to the filtered catalogue

Genre chips now deep-link to /?genres=<id> and user-tag chips to
/?tags=<id>, reusing the homepage catalogue's existing filter params —
turning the detail page's metadata into one-tap discovery. Tag chips keep
their remove affordance (the Chip's href branch preventDefaults the remove
button). e2e asserts both chip hrefs.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

frontend/e2e/chip-catalog-links.spec.ts

@@ -0,0 +1,60 @@
+import { test, expect, type Page } from './fixtures';
+
+// Genre and user-tag chips on the manga detail page deep-link into the
+// homepage catalogue pre-filtered by that genre / tag.
+
+const mangaId = 'a1111111-1111-1111-1111-111111111111';
+const genreId = 'g0000000-0000-0000-0000-000000000005';
+const tagId = 't0000000-0000-0000-0000-000000000042';
+
+async function mockDetail(page: Page) {
+    await page.route('**/api/v1/auth/config', (r) =>
+        r.fulfill({ status: 200, contentType: 'application/json', body: JSON.stringify({ self_register_enabled: true, private_mode: false }) })
+    );
+    await page.route('**/api/v1/auth/me', (r) =>
+        r.fulfill({ status: 401, contentType: 'application/json', body: JSON.stringify({ error: { code: 'unauthenticated', message: 'no' } }) })
+    );
+    await page.route('**/api/v1/auth/me/preferences', (r) =>
+        r.fulfill({ status: 401, contentType: 'application/json', body: '{}' })
+    );
+    await page.route('**/api/v1/me/bookmarks*', (r) =>
+        r.fulfill({ status: 200, contentType: 'application/json', body: JSON.stringify({ items: [], page: { limit: 50, offset: 0, total: 0 } }) })
+    );
+    await page.route(`**/api/v1/mangas/${mangaId}/chapters*`, (r) =>
+        r.fulfill({ status: 200, contentType: 'application/json', body: JSON.stringify({ items: [], page: { limit: 50, offset: 0, total: 0 } }) })
+    );
+    await page.route(`**/api/v1/mangas/${mangaId}/similar`, (r) =>
+        r.fulfill({ status: 200, contentType: 'application/json', body: JSON.stringify({ items: [] }) })
+    );
+    await page.route(`**/api/v1/me/read-progress/${mangaId}`, (r) =>
+        r.fulfill({ status: 404, contentType: 'application/json', body: JSON.stringify({ error: { code: 'not_found', message: 'no' } }) })
+    );
+    await page.route(`**/api/v1/mangas/${mangaId}`, (r) =>
+        r.fulfill({
+            status: 200,
+            contentType: 'application/json',
+            body: JSON.stringify({
+                id: mangaId, title: 'Berserk', status: 'ongoing', alt_titles: [], description: null,
+                cover_image_path: null, created_at: '2026-01-01T00:00:00Z', updated_at: '2026-01-01T00:00:00Z',
+                authors: [],
+                genres: [{ id: genreId, name: 'Fantasy' }],
+                tags: [{ id: tagId, name: 'isekai', added_by: null }],
+                content_warnings: [], chapter_storage_bytes: 0
+            })
+        })
+    );
+}
+
+test('genre and tag chips link to the filtered catalogue', async ({ page }) => {
+    await mockDetail(page);
+    await page.goto(`/manga/${mangaId}`);
+
+    await expect(page.getByTestId(`genre-chip-${genreId}`)).toHaveAttribute(
+        'href',
+        `/?genres=${genreId}`
+    );
+    await expect(page.getByTestId(`tag-chip-${tagId}`)).toHaveAttribute(
+        'href',
+        `/?tags=${tagId}`
+    );
+});