test: unit and end-to-end suites

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

test/rename-heading.test.cjs

@@ -0,0 +1,45 @@
+const { app, BrowserWindow } = require('electron');
+const path = require('path');
+const os = require('os');
+const fs = require('fs');
+
+const tmp = fs.mkdtempSync(path.join(os.tmpdir(), 'ink-test-rename-'));
+const vault = path.join(tmp, 'Vault');
+fs.mkdirSync(vault);
+
+fs.writeFileSync(path.join(vault, 'A.md'), '# Target\n');
+fs.writeFileSync(path.join(vault, 'B.md'), 'Go to [[A#Target]]\n');
+
+app.setPath('userData', tmp);
+fs.writeFileSync(path.join(tmp, 'settings.json'), JSON.stringify({ vault, lastPage: 'A', bounds: { width: 1280, height: 860 } }));
+require('../electron/main.cjs');
+
+const sleep = (ms) => new Promise((r) => setTimeout(r, ms));
+
+app.whenReady().then(async () => {
+  let win;
+  for (let i = 0; i < 80 && !(win = BrowserWindow.getAllWindows()[0]); i++) await sleep(100);
+  const wc = win.webContents;
+  if (wc.isLoading()) await new Promise((r) => wc.once('did-finish-load', r));
+  const js = (code) => wc.executeJavaScript(`(async () => { ${code} })()`);
+  
+  await sleep(1000);
+  // Change heading in A
+  await js(`
+    const el = document.querySelector('.b-h1 .c');
+    el.textContent = 'New Target';
+    const evt = new Event('input', { bubbles: true });
+    el.dispatchEvent(evt);
+  `);
+  // Trigger blur to save
+  await js(`
+    const el = document.querySelector('.b-h1 .c');
+    el.blur();
+  `);
+  await sleep(3000); // Wait for heading renames to commit (2000ms delay)
+  
+  // Read B
+  const b = fs.readFileSync(path.join(vault, 'B.md'), 'utf8');
+  console.log("B content:", b);
+  app.exit();
+});