chore: update .gitignore for Node.js and TypeScript

- Add node_modules/ and npm debug logs
- Add TypeScript build artifacts (*.tsbuildinfo)
- Ignore compiled JS files in web/static/
- Keep htmx.min.js (third-party library)
- Add IDE ignores (.idea, .vscode)
- Add OS ignores (DS_Store, Thumbs.db)
- Add database and uploads directories
- Ignore package-lock.json (use npm shrinkwrap for production if needed)

Standard ignore patterns for modern web development with Go backend.

.gitignore

@@ -1,17 +1,37 @@
-# Ignore build artifacts and logs
+# Build artifacts
 bookmann/
 bookmann.*
 !bookmann/
 
+# Node.js
+node_modules/
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+package-lock.json
+.pnpm-debug.log*
+
+# TypeScript
+*.tsbuildinfo
+*.d.ts.map
+
+# Compiled JavaScript (keep .ts source, ignore .js)
+web/static/*.js
+!web/static/htmx.min.js
+
 # Temporary files
 tmp/
 temp/
 *.tmp
+*.swp
+*.swo
+*~
 
 # Testing coverage
 *.out
 *.cover
 coverage.html
+*.test
 
 # Logs
 *.log
@@ -19,4 +39,21 @@ coverage.html
 
 # Environment
 .env
-!.env.example
+!.env.example
+.env.test
+.env.local
+
+# IDE
+.idea/
+.vscode/
+*.iml
+.DS_Store
+Thumbs.db
+
+# Uploads
+uploads/
+
+# Database
+*.db
+*.sqlite
+*.sqlite3