Pre-extract reader-mode content during feed fetch, not on article open

Feeds like West Hawaii Today need Readability to strip a paywall/
boilerplate wrapper, and that extraction was happening lazily the
first time an article was opened -- a hidden WebView load + JS eval
that left the reader sitting on a spinner. Do it for new articles from
reader-mode feeds right inside FeedFetchWorker.fetchOne instead, so
it's already cached (both on the launch fetch and the 5am morning
fetch) by the time the article is actually opened.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017GMEkHeqKz6FLkmizowBTK

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