Take Brave snippets by position rather than by class name

Brave's source name was leaking into every snippet ("Medium March 27,
2025 - ..."), because the .sitename/.netloc selectors guessed for it match
nothing. Rather than guess again, use the ordering: an engine rendering
"source / breadcrumb / title / description" puts all its metadata before
the title, so everything after the title line is the description. Class
names churn; that ordering does not. The named selectors stay as the
fallback for when the title is not on a line of its own.

Verified against Brave, and Google/DuckDuckGo/Bing re-checked for
regressions.

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