Fix/remove hardcoded discovery time

[DTriple-p]

Summary

Fixes #983: Removes hardcoded search discovery time claim in SearchResultsVisualizer.tsx.

Context & Changes

SearchResultsVisualizer was rendering a static "discovered in 0.8s" string for every query regardless of actual search duration, misrepresenting search timing to users.

• Removed the hardcoded discovered in 0.8s span element from the search results count header.

Verification

• Verified that search result counts render accurately without displaying an arbitrary timing claim.

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