feat(search): frontend content search (text + warnings) + manga warning banner

Surfaces the analysis pipeline in the UI:

- api clients: searchPages() + PageSearchItem/ContentWarning types;
  listMangas cwInclude/cwExclude; MangaDetail.content_warnings.
- /search gains a content-search mode: free-text over OCR+scene and
  tri-state content-warning toggles (include/exclude), driven by URL
  params (text, cw_include, cw_exclude) and the new /me/page-search
  endpoint. Tag browsing is preserved when no content filter is active.
- manga detail renders a deduped content-warning banner.

Tests: vitest param serialization (searchPages CSV/text/cw, listMangas
cw); Playwright text-search + cw-toggle flows (route-mocked). svelte-check
+ build clean; full vitest (258) + search e2e (7) green.

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

frontend/e2e/search.spec.ts

@@ -89,6 +89,25 @@ const mangasResponse = {
     page: { limit: 100, offset: 0, total: 1 }
 };
 
+const pageSearchResponse = {
+    items: [
+        {
+            page_id: pageId,
+            chapter_id: chapterId,
+            manga_id: mangaId,
+            page_number: 5,
+            chapter_number: 1,
+            chapter_title: null,
+            manga_title: 'Berserk',
+            storage_key: `mangas/${mangaId}/chapters/${chapterId}/pages/0005.png`,
+            is_nsfw: true,
+            content_warnings: ['gore'],
+            rank: 0.9
+        }
+    ],
+    page: { limit: 100, offset: 0, total: 1 }
+};
+
 async function mockSearch(page: Page) {
     await page.route('**/api/v1/auth/config', (route) =>
         route.fulfill({
@@ -125,6 +144,13 @@ async function mockSearch(page: Page) {
             body: JSON.stringify({ items: distinct })
         })
     );
+    await page.route('**/api/v1/me/page-search*', (route) =>
+        route.fulfill({
+            status: 200,
+            contentType: 'application/json',
+            body: JSON.stringify(pageSearchResponse)
+        })
+    );
     await page.route('**/api/v1/me/page-tags?**', (route) =>
         route.fulfill({
             status: 200,
@@ -248,4 +274,32 @@ test.describe('/search', () => {
             `/manga/${mangaId}`
         );
     });
+
+    test('text search sets ?text= and renders page results', async ({ page }) => {
+        await mockSearch(page);
+        await page.setViewportSize(DESKTOP);
+        await page.goto('/search');
+
+        await page.getByTestId('search-text-input').fill('dragon');
+        await page.getByTestId('search-text-input').press('Enter');
+
+        await expect(page).toHaveURL(/text=dragon/);
+        await expect(page.getByTestId('search-content-list')).toBeVisible();
+        await expect(
+            page.getByTestId(`search-result-${pageId}`)
+        ).toBeVisible();
+    });
+
+    test('content-warning toggle sets ?cw_include= and searches', async ({
+        page
+    }) => {
+        await mockSearch(page);
+        await page.setViewportSize(DESKTOP);
+        await page.goto('/search');
+
+        await page.getByTestId('cw-toggle-gore').click();
+
+        await expect(page).toHaveURL(/cw_include=gore/);
+        await expect(page.getByTestId('search-content-list')).toBeVisible();
+    });
 });