Added playwright files to .gitignore

Author: Francis6-git

.gitignore

@@ -9,4 +9,8 @@ coverage
 # Soroban test runner — auto-generated, never commit
 **/test_snapshots/
 fix.md
-.npm-cache/
+.npm-cache/
+
+# Playwright test execution items
+frontend/playwright-report/
+frontend/test-results/