fix: normalize blank spaces in actor search results

[stellhub]

Summary

• normalize repeated whitespace in actor titles and descriptions used by search results
• apply the same normalization to default text output, structured content, and widget cards
• add regression tests covering markdown, structured output, and widget formatting

Closes #785

Testing

• npm test
• npm run check
• reproduced search-actors locally with instagram and verified doubled spaces in descriptions are removed

[stellhub]

Ready for review. This PR comes from a fork, and the current GitHub Actions run is in 'action_required' before any jobs start. Could a maintainer please approve and run the workflows for this PR? I have already run
pm test\ and
pm run check\ locally, both passed.

[MQ37]

I just check the current latest release at mcp.apify.com and this does not seem to be issue anymore. Thus I think we can close the issue and this PR. @jirispilka Can you please also check?