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feat(search): whole words, relevance ranking and typo-tolerant search - #172
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… texts rank above images
…en nothing matches exactly
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A word followed by a space must now appear on its own: links, paths, emails and longer words no longer match it, while the word still being typed keeps matching by prefix. Results are ranked by relevance (bm25 weighted by field, exact spelling above prefix), with the date only breaking ties; images and items without words of their own go last unless labelled, and an order picked by hand is kept. When nothing matches exactly, words of four letters or more are matched with one or two typos against the index vocabulary. The page-ten budget rises to 60 ms, since ranking scores every match on each page.