[05] Recover known-item searches from map titles, citations, and creators

[ewlarson]

Implementation order: 05 of 11 category issues. 20/298 reviewed August zero-result events (6.7%).

A concrete retrieval path for patrons who already know the item or map series they want.

Dependencies: Reuse the shared suggestion/count interface in #396; this can proceed independently of geographic parsing. This sequence is a recommended work queue, not a requirement to close every earlier issue. See #396 for the complete order.

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August 2026 completed top-100 zero-result review: Known map, title, citation, or creator accounts for 7 of 100 ranked query rows, representing 20 recorded zero-result searches. The September 10 export ranks all 885 distinct non-empty zero-result queries without a minimum-frequency cutoff; the top 100 represent 298 events. All 100 August queries are present and categorized, and monthly totals reconcile. These are recorded searches, not unique patrons; category assignments infer intent rather than prove failure causes.

Evidence: frontend/src/data/analytics/zeroResultQueries2026.json (exported September 10, 2026; August 1 inclusive–September 1 exclusive UTC). Ordering is count descending, then query using database collation, with case preserved. Full category inventory: docs/frontend/zero-result-query-review-2026-08.md in the working change. This issue contains its complete query evidence below.

Rank	Query	Zero-result searches
10	Map of the settled part of Wisconsin and Iowa	5
42	Plat Book of Sibley County Minnesota	3
50	U.S. Army Map Service. (2016). U.S. Army Map Series K501: Iraq and Iran: Zenjan J-39S. U.S. Army Map Service. https://isac-idb.uchicago.edu/id/94ecf195-fa5f-4120-9504-23e9550234cb	3
52	Warner, Higgins & Beers	3
94	Bird's eye view of Iowa City	2
99	Carta geologica delle	2
100	Carta geologica delle Tre Venezie, Legnago	2

Interpretation notes:

• Rank 50: Full citation with source URL; potential known-item intent.
• Rank 52: Likely creator/publisher lookup; verify catalog context.
• Rank 94: Likely map-title search.
• Rank 99: Partial non-English map title; preserve language.
• Rank 100: Non-English map title and place.

Acceptance criteria:

• Recognize likely map titles and pasted citations; propose extracted title, series, creator, or identifier searches with clear labels.
• Handle punctuation, dates, and citation URLs without requiring every citation token to match metadata.
• Use existing indexed identifiers and source links where available; distinguish an exact item match from related series or editions.
• If the item is unavailable, offer related collections and a help path without promising holdings or an exact match.
• Test full titles, plat-book titles, and a citation containing a source URL; preserve original input and make edits reversible.
• Track suggestion impressions, acceptance, next-search nonzero results, and subsequent resource engagement using category/action aggregates; avoid collecting additional raw address or coordinate text. Distinguish lookup errors from genuine no-match outcomes.

Implementation context: frontend/src/components/search/NoResultsSearchHelp.tsx already offers keyword and Nominatim suggestions, but builds fresh search URLs that discard filters. frontend/src/__tests__/pages/SearchPage.test.tsx explicitly expects the location map to be hidden for zero results. Extend this existing experience and update focused behavior/accessibility tests. Related: #270 (zero-result analytics), #231 (Advanced Search location field).

Tracking: #396. Shared recovery, constraint preservation, and baseline validation are coordinated there. The top-100 evidence audit is complete.

• Support creator/publisher names and partial non-English map titles as distinct candidate interpretations, preserving language and avoiding an exact-item claim without a match.