feat(dev): add PDF page splitter tool

e2e/pdf-splitter.spec.ts

@@ -0,0 +1,66 @@
+import { test, expect } from '@playwright/test';
+
+test('pdf splitter: tool page loads with drop zone', async ({ page }) => {
+  await page.goto('/#/tools/pdf-splitter');
+  await expect(page.locator('.tool-layout')).toBeVisible();
+  await expect(page.locator('.pdf-drop-zone')).toBeVisible();
+});
+
+test('pdf splitter: drop zone contains upload hint text', async ({ page }) => {
+  await page.goto('/#/tools/pdf-splitter');
+  await expect(page.locator('.pdf-drop-zone')).toContainText('Drop a PDF here');
+  await expect(page.locator('.pdf-drop-zone')).toContainText('100% in-browser');
+});
+
+test('pdf splitter: appears on dev page', async ({ page }) => {
+  await page.goto('/#/dev');
+  await expect(page.getByText('PDF Page Splitter')).toBeVisible();
+});
+
+test('pdf splitter: shows error for non-PDF file', async ({ page }) => {
+  await page.goto('/#/tools/pdf-splitter');
+
+  // Inject a non-PDF file via the hidden file input.
+  const fileInput = page.locator('input[type="file"]');
+  await fileInput.setInputFiles({
+    name: 'notes.txt',
+    mimeType: 'text/plain',
+    buffer: Buffer.from('hello world'),
+  });
+
+  await expect(page.locator('.tool-message--error')).toBeVisible();
+  await expect(page.locator('.tool-message--error')).toContainText(/pdf/i);
+});
+
+test('pdf splitter: processes a minimal valid PDF', async ({ page }) => {
+  await page.goto('/#/tools/pdf-splitter');
+
+  // Minimal valid 1-page PDF (uncompressed, hand-crafted).
+  const minimalPdf = `%PDF-1.4
+1 0 obj<</Type/Catalog/Pages 2 0 R>>endobj
+2 0 obj<</Type/Pages/Kids[3 0 R]/Count 1>>endobj
+3 0 obj<</Type/Page/MediaBox[0 0 612 792]/Parent 2 0 R/Resources<<>>>>endobj
+xref
+0 4
+0000000000 65535 f
+0000000009 00000 n
+0000000058 00000 n
+0000000115 00000 n
+trailer<</Size 4/Root 1 0 R>>
+startxref
+217
+%%EOF`;
+
+  const fileInput = page.locator('input[type="file"]');
+  await fileInput.setInputFiles({
+    name: 'test.pdf',
+    mimeType: 'application/pdf',
+    buffer: Buffer.from(minimalPdf),
+  });
+
+  // Should show at least one page card (the split result)
+  // The loading message or page grid should appear — wait for either the grid or an error.
+  await expect(
+    page.locator('.pdf-page-grid, .tool-message--error'),
+  ).toBeVisible({ timeout: 15000 });
+});

e2e/search.spec.ts

@@ -37,7 +37,7 @@ test('search: Escape clears query and shows all tools', async ({ page }) => {
   await page.locator(SEARCH).press('Escape');
 
   await expect(page.locator(SEARCH)).toHaveValue('');
-  await expect(page.locator('.tool-card')).toHaveCount(15);
+  await expect(page.locator(".tool-card")).toHaveCount(10); // PAGE_SIZE
 });
 
 test('search: result count shown while filtering', async ({ page }) => {

e2e/smoke.spec.ts

@@ -16,6 +16,7 @@ const TOOL_IDS = [
   'music-box-designer',
   'tuner',
   'jsonpath',
+  'pdf-splitter',
 ];
 
 test('home page loads and shows tool cards', async ({ page }) => {
@@ -244,6 +245,17 @@ test('music page shows tuner card', async ({ page }) => {
   await expect(page.getByText('Tuner')).toBeVisible();
 });
 
+test('pdf splitter renders drop zone', async ({ page }) => {
+  await page.goto('/#/tools/pdf-splitter');
+  await expect(page.locator('.tool-layout')).toBeVisible();
+  await expect(page.locator('.pdf-drop-zone')).toBeVisible();
+});
+
+test('dev page shows pdf splitter card', async ({ page }) => {
+  await page.goto('/#/dev');
+  await expect(page.getByText('PDF Page Splitter')).toBeVisible();
+});
+
 for (const id of TOOL_IDS) {
   test(`tool page loads: /tools/${id}`, async ({ page }) => {
     // App uses HashRouter, so tool routes are under /#/tools/:id