Add error handling to getMoreSongs

[Sam12354]

This adds some basic error handling to the getMoreSongs function.

Before, if the request failed or something went wrong with the API, the app could break without any clear message.

Now it:

• uses try/catch around the fetch call
• checks the response before using the data
• logs errors to help with debugging

Just makes things a bit more stable when the API or network has issues.