Assistant/source cred input url fix

[rosannamilner]

Fixed problem with source credibility results not displaying for input URL.

• problem of missing .length with comparison
• removed [0] as backend sending inputUrl as single dictionary, not a list
• backend sets to null already if empty so ternary operator is not needed
• resolvedDomain swapped to credibilityScope so as to pick up accounts correctly (x.com/LordBebo instead of x.com)

Tested with these result situations:

• input URL SC result, no extracted URLs SC results: https://x.com/MyLordBebo/status/1892116615161917896
• input URL SC result with extracted URLs SC results: https://www.breitbart.com/europe/2025/12/01/biggest-threat-in-800-years-scrapping-juries-imperils-freedom-of-speech/
• no input URL SC result, no extracted URLs SC results: https://www.eauc.org.uk/learning/carbon-literacy-training/
• no input URL SC result with extracted URLs SC results: https://www.snopes.com/fact-check/elvis-danny-sullivan-story/