Fix: Fetch details using lowercase problem ID #4
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Problem:
Codeforces problem URLs work with both uppercase (e.g., ../1234/A) and lowercase (e.g., ../1234/a) problem IDs. However, the extension didn't handle lowercase problem IDs correctly, hence it would fail on those URLs.
Fix:
This PR has a simple fix that normalizes the problem ID to uppercase before processing, ensuring the extension works regardless of the case used in the URL.