chore: add root-level .gitignore for Node.js and React Native

[rohansaini-02]

Problem

The repository currently has no root-level .gitignore file. As the project grows with multiple modules (poc-sync-engine, poc-frappe-api) and eventually the full React Native application, there is a direct risk of committing generated artifacts to version control.

Without a .gitignore, the following files can accidentally end up in the repository:

• node_modules/ directories (hundreds of MBs of dependencies)
• • Build outputs (dist/, coverage/, android/app/build/)
• • • Environment secrets (.env, .env.local)
• • • • IDE-specific configuration (.vscode/, .idea/)
• • • • • OS metadata (.DS_Store, Thumbs.db)

This increases repository size, slows down cloning for new contributors, and creates a risk of leaking sensitive credentials.

Proposed Solution

Add a single .gitignore file at the repository root that covers the full stack used in this project:

• Node.js / npm: node_modules/, dist/, coverage/, *.log
• • React Native: android/app/build/, ios/Pods/, *.apk, *.ipa
• • • Environment: .env, .env.local
• • • • IDE: .vscode/, .idea/
• • • • • OS: .DS_Store, Thumbs.db

Acceptance Criteria

• A root-level .gitignore file exists
• - [ ] It covers Node.js, React Native, IDE, OS, and environment patterns
• - [ ] No existing tracked files are affected