Updates console messages to be more informative and accurate:

1. When no script preloads are found:
   - Clarifies it's looking for rel="preload" as="script"
   - Adds helpful note that this is fine (only preload critical scripts)

2. When preloads exist but no anti-patterns detected:
   - Changes from generic "properly configured" to specific
     "No anti-patterns detected"
   - Explains what makes them valid (blocking scripts or
     mitigated with fetchpriority="low")
   - Larger, more prominent success message

This addresses the issue where a site with valid preloads
(e.g., fonts, images) would see "No preloaded scripts found"
which was technically true but could be confusing.

Now the messaging is clear about what was validated and why
the result is positive.