When the WebsiteCarbon API is protected by Cloudflare and requests
originate from datacenter IPs, Cloudflare may return an HTML challenge
page instead of JSON. This caused JSON.parse() to throw an uncaught
SyntaxError exception, crashing the entire application.
This fix:
- Checks if the response starts with HTML markers before parsing
- Wraps JSON.parse in try-catch for additional safety
- Returns a descriptive error message instead of crashing
Fixes#268
a163c356b9