test(e2e): harden mobile layout coverage, artifact isolation, and live pane assertions

- Store Playwright evidence in ignored test-results/ paths by default while preserving env override
- Clean up disposable temporary application data directories in /tmp on global teardown and exit signals
- Add Chromium mobile and tablet viewport profiles (phone portrait/landscape, tablet) for automated coverage
- Add a scoped Chromium mobile layout CI check on shard 1/4 to prevent redundant matrix execution
- Reach mobile Settings and Notes views via genuine sidebar navigation controls opened through the hamburger button
- Add assertions against live rendered Notes and Documents panes honoring safe-area top and height constraints
- Document local WebKit prerequisites and physical iOS/PWA test limitations in tests/e2e/README.md and package.json

tests/e2e/ios-layout-teardown.cjs

@@ -0,0 +1,28 @@
+const fs = require('node:fs');
+const os = require('node:os');
+const path = require('node:path');
+
+/**
+ * Global teardown for the iOS/mobile layout Playwright test suite.
+ * Cleans up only disposable temporary application data directories,
+ * preserving diagnostic artifacts (screenshots and failure traces) in test-results/.
+ */
+module.exports = async () => {
+  const dataDirectory = process.env.ODYSSEUS_LAYOUT_DATA_DIR;
+  if (!dataDirectory || typeof dataDirectory !== 'string') return;
+
+  try {
+    const resolvedData = path.resolve(dataDirectory);
+    const allowedTmpBases = [os.tmpdir(), '/var/tmp', '/tmp'].map(b => path.resolve(b));
+    const isTmp = allowedTmpBases.some(base => resolvedData.startsWith(base + path.sep));
+    const baseName = path.basename(resolvedData);
+
+    if (isTmp && (baseName.startsWith('odysseus-ios-layout-') || baseName.startsWith('odysseus-pr6396-'))) {
+      if (fs.existsSync(resolvedData)) {
+        fs.rmSync(resolvedData, { recursive: true, force: true });
+      }
+    }
+  } catch (err) {
+    console.warn(`[ios-layout-teardown] Warning: failed to clean temporary runtime dir: ${err.message}`);
+  }
+};