Real-browser tests (Playwright) and housekeeping

- npm run test:e2e builds the app, runs it on port 3101 with an empty throwaway
  database and drives Chrome (the installed one; no browser download) through
  notes and the paste check, the daily five minutes and weekly recall,
  translation compare (Bible text faked), and two-screen presenting.
- Vitest skips e2e/; ESLint knows the e2e folder and playwright.config.js.
- .gitignore: the local demo video, Playwright output and sign-in file.
- README and TODO describe the browser tests and what CI still needs.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

e2e/study.spec.js

@@ -0,0 +1,43 @@
+import { test, expect } from '@playwright/test';
+import { NOTE_TEXT, pasteInto, resumeButton, seedStudy } from './helpers.js';
+
+test('open a study, write notes, answer the paste check, and use the keyboard', async ({ page }) => {
+  const { title } = await seedStudy(page);
+  await expect(page.getByRole('heading', { name: title })).toBeVisible();
+  await expect(page.getByText(/needs a connection for john/i).first()).toBeVisible(); // the offline badge
+  await resumeButton(page, title).click();
+  await expect(page.getByRole('heading', { name: 'John 3:16–18' })).toBeVisible();
+
+  // keyboard: 2 jumps into Interpret, Escape leaves it
+  await page.keyboard.press('2');
+  await expect(page.getByRole('textbox', { name: 'Interpret' })).toBeFocused();
+  await page.keyboard.press('Escape');
+  await expect(page.getByRole('textbox', { name: 'Interpret' })).not.toBeFocused();
+
+  // a long paste asks whether it is from AI; "No, I wrote it" counts the words as yours
+  await page.keyboard.press('1');
+  const observe = page.getByRole('textbox', { name: 'Observe' });
+  const pasted = Array.from({ length: 24 }, (_, i) => `pasted${i}`).join(' ');
+  await pasteInto(observe, pasted);
+  await observe.fill(`${NOTE_TEXT.observation} ${pasted}`);
+  await expect(page.getByText(/is this from ai\?/i)).toBeVisible();
+  await expect(page.getByText(/24 words here were pasted/i)).toBeVisible();
+  await page.getByRole('button', { name: 'No, I wrote it' }).click();
+  await expect(page.getByText(/is this from ai\?/i)).toHaveCount(0);
+  await expect(page.getByText(/were pasted/i)).toHaveCount(0);
+
+  // either half of the right column can be folded
+  const resources = page.getByRole('button', { name: /commentary & resources/i });
+  await resources.click();
+  await expect(resources).toHaveAttribute('aria-expanded', 'false');
+  await page.getByRole('button', { name: 'Your notes' }).click(); // folding the last open half opens the other
+  await expect(resources).toHaveAttribute('aria-expanded', 'true');
+
+  // the reading list belongs to the study
+  await page.getByRole('button', { name: 'Your notes' }).click(); // make room: fold notes, resources stay open
+  await page.getByRole('tab', { name: /reading list/i }).click();
+  await page.getByRole('textbox', { name: /add to the reading list/i }).fill('Carson on John');
+  await page.keyboard.press('Enter');
+  await page.getByRole('checkbox', { name: /read: carson on john/i }).check();
+  await expect(page.getByRole('checkbox', { name: /read: carson on john/i })).toBeChecked();
+});