Improve failed act logs

[miguelg719]

why

The current log No Observe Results found is too vague and uninformative.

what changed

Updated the logs on failed self healing and failing to observe in act; with a link to act best practices in the docs.

test plan

[changeset-bot]

🦋 Changeset detected

Latest commit: ac32b63

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[greptile-apps]

Greptile Summary

Updated error messages in the actHandler.ts when failed acts cannot find elements to act on. The changes replace vague "No observe results found" messages with clearer "Element not found" and "No elements found to act on" messages. Additionally, when the main act function fails to find elements, it now logs a helpful message with a link to the act best practices documentation.

Confidence score: 5/5

• This PR is safe to merge with minimal risk
• The changes are purely cosmetic improvements to error messages and logging, making them more user-friendly without altering any core logic or functionality. The changeset is properly formatted and follows conventions.
• No files require special attention

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