Fix button icon alignment & add missing .env.example in frontend

[NayanUnni95]

Describe the bug

1. The button icon in the frontend UI is not properly aligned (appears slightly off-center).
2. The project is missing a .env.example file in the frontend directory. When checking for environment variables, it’s unclear which ones are required.

To Reproduce

For Button Alignment:

1. Go to the frontend app.
2. Navigate to the page containing the action button.
3. Observe the icon inside the button.

For .env.example:

1. Check the frontend/ directory.
2. Notice that there is no .env.example file with required environment variables listed.

Expected behavior

1. The button icon should be properly centered/aligned within the button.
2. The frontend/.env.example file should be present with all required environment variables clearly defined (e.g., VITE_GOOGLE_CLIENT_ID, VITE_API_URL).

Screenshots

Screencast.from.2025-08-17.19-28-28.webm

Additional context

1. Adding .env.example helps new contributors set up the project quickly.
2. Fixing the button alignment improves the UI/UX consistency.