chore: update .gitignore

.claude, .devcontainer, .github/prompts, README.md and the two root
Playwright scratch scripts are local tooling. They stay on disk and are
ignored, so no `git add -A` sweeps them back in.

.gitignore

@@ -1,8 +1,14 @@
-node_modules
-dist
+.claude
+.devcontainer
+.DS_Store
+.github/prompts
 .vite
 debug
-.DS_Store
-tests/render-parity/fixtures
-tests/render-parity/FINDINGS.md
+dist
 docs/others
+node_modules
+probe.mjs
+README.md
+shot.mjs
+tests/render-parity/FINDINGS.md
+tests/render-parity/fixtures