chore: Add .gitignore for build artifacts and dependencies

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,37 @@
+# Dependencies
+node_modules/
+
+# Build output
+dist/
+
+# IDE
+.idea/
+.vscode/
+*.swp
+*.swo
+
+# Logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Environment files
+.env
+.env.local
+.env.*.local
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Test coverage
+coverage/
+.nyc_output/
+
+# TypeScript cache
+*.tsbuildinfo
+
+# Temporary files
+tmp/
+temp/