fix(search): snippet falls back to title and author fields

[ashishbhateja]

What

snippet() builds the contextual excerpt shown beneath a search result. It previously scanned only article.summary and article.body for the matched term. When a query matched only the title or author field — a common case for author-name searches — the function fell back to the beginning of the summary, which is unrelated to why the result appeared.

Before

Searching "Nirodbaran" would surface the article correctly (the author field is indexed), but the displayed snippet would show the first line of the summary — telling the reader nothing about why this result matched.

After

The field scan is extended to [summary, body, title, author]. The existing priority is preserved (summary > body), with title and author tried before giving up. For an author-name search the snippet now reads, e.g., Nirodbaran — directly confirming the match.

Change

One-line diff in src/search.js:

- for (const text of [article.summary, article.body]) {
+ for (const text of [article.summary, article.body, article.title, article.author]) {

Tests

Two new smoke checks cover both new fallback paths:

• snippet falls back to the title when only the title contains the matched term
• snippet falls back to the author when only the author contains the matched term

All 21 checks pass. Build succeeds (node scripts/build.mjs content/sample-edition.json).

Advances #3.

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