chore: update .gitignore

Ignore the Claude settings dir, __tests__ build output, and local
SEO-fallback screenshots.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: tthallos

.gitignore

@@ -1,5 +1,8 @@
+.claude/
 node_modules/
 dist/
 *.tsbuildinfo
 .DS_Store
 playground/cases/
+playground/seo-fallback-preview.png
+__tests__