Show the newest news article whose language matches the wallet's active
locale, falling back to the newest English article when none exists.
Language detection per article, in priority order:
1. An event language tag: NIP-32-style ["l","<code>","ISO-639-1"] or the
bare ["l","<code>"] / ["lang","<code>"] (code is the tag's 2nd element),
extracted in handle_news and persisted on NewsItem.lang.
2. A trailing "[xx]" marker on the title (case-insensitive, xx = ISO 639-1
two letters), e.g. "2026-07-05 Welcome to Goblin [de]".
3. No marker anywhere = English.
Selection happens at the data layer (news_latest): the store stays
language-agnostic (still newest-per-d-tag, cap 8, edit-in-place). Among all
cached articles, filter by detected language, take the newest by created_at;
the "[xx]" marker is stripped from the displayed title. The app locale is
folded to its ISO 639-1 primary for matching (zh-CN -> zh).
The GOBLIN_FAKE_NEWS debug hook now injects an English + German sample so the
panel selection can be screenshotted per locale.
Unit tests: tag detection (both shapes), title-suffix detect + strip,
no-marker-means-English, zh-CN folding, locale match + English fallback,
newest-within-language-slice.
2ro
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