chore(.gitignore): add .playwright-mcp/

why: Playwright MCP tooling creates a .playwright-mcp/ directory that
should not be tracked.
what:
- Add .playwright-mcp/ to .gitignore

Author: tony

.gitignore

@@ -86,3 +86,4 @@ docs/_static/css/fonts.css
 **/CLAUDE.local.md
 **/CLAUDE.*.md
 **/.claude/settings.local.json
+.playwright-mcp/