chore(.gitignore): update gitignore rules for better project hygiene

- Add entries for Node modules, NPM/Yarn lock files, and Prettier/ESLint configs.
- Include staged changes file and IDE-specific directory (.idea/) in ignored paths.

Benefits:
- Reduces noise in version control by excluding generated and environment-specific files.
- Improves consistency across developer environments.

.gitignore

@@ -1 +1,18 @@
-node_modules
+# Node modules
+node_modules/
+
+# NPM/Yarn lock
+package-lock.json
+package.json
+
+# Prettier
+.prettierrc.json
+
+# ESLint
+eslint.config.cjs
+
+# Staged changes
+staged_changes.diff
+
+# IDE (WebStorm/IntelliJ IDEA)
+.idea/