feat(shipwrecks): period picker like air accidents, sharper icons

- Replace the four era chips with the start and end year pickers the
  air-accidents layer uses (the same RowRange control, ported as is);
  the era colours stay as a legend under the row.
- Rasterize the boat marker at 144 px so large markers stay sharp.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

DATA_SOURCES.md

@@ -40,7 +40,7 @@ How to read this:
 | **NIFC WFIGS** (Wildland Fire Interagency Geospatial Services, ArcGIS feature service) | Fire Perimeters layer: current interagency wildfire incident perimeters, containment, and incident facts | U.S. public domain (interagency wildland-fire data published through the [NIFC Open Data portal](https://data-nifc.opendata.arcgis.com/)); fetched keyless through `/api/fire-perimeters` (5-minute server cache) with `exceededTransferLimit` paging | "Wildfire perimeters: National Interagency Fire Center (WFIGS)" |
 | **S2 Underground GhostMaps** (`github.com/s2underground/GhostMaps`) | S2 GhostMaps layer: the current edition of S2's KMZ intel products (Common Intelligence Picture, 30-day kinetic pull, Border Crisis Map, Iran and Yemen products, newest incident drop). Keyless. `/api/ghostmaps` reads the branch head from git's ref advertisement every 15 s (`GHOSTMAPS_POLL_SECONDS`, minimum 5 s), lists the tree through the GitHub REST API only when the head changes (optional `GITHUB_TOKEN`), downloads files by commit-pinned raw URLs into `.gev-cache/ghostmaps/` and pushes new catalogs to browsers over server-sent events | [CC BY-NC-SA 4.0](https://creativecommons.org/licenses/by-nc-sa/4.0/) (repository README: "S2 Underground © 2025 by S2A1"); non-commercial, attribution required; files are fetched at runtime, never stored in this repository | "S2 GhostMaps intel products: S2 Underground © by S2A1, CC BY-NC-SA 4.0" — shown in-app |
 | **EMODnet Human Activities — Ship wrecks** (`ows.emodnet-humanactivities.eu/wfs`, layer `emodnet:heritageshipwrecks`) | Shipwrecks layer: about 7,000 wrecks in European waters (name, sinking year and text, vessel type, least depth and its quality, position accuracy, period, cargo, protected status). Keyless WFS GeoJSON, fetched by `/api/shipwrecks` once a day; rows sourced from wrecksite.eu are skipped and text naming people is dropped | [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/) (EMODnet catalogue record `e965088b-a265-4517-84df-c49b156af8a7`; data originator AND-International, compiled from SHOM, National Monuments Service, Historic England and the Oxford Roman Economy Project); fetched at runtime, not stored in this repository | "Shipwrecks (Europe): EMODnet Human Activities (data originator AND-International, …), CC BY 4.0" — shown in-app |
-| **Wikidata — shipwrecks** (`query.wikidata.org/sparql`) | Shipwrecks layer: shipwreck items (Q852190) with a coordinate and at least one Wikipedia article: name, ship type, sinking date, death count, description and article link. Keyless, fetched by `/api/shipwrecks` once a day | [CC0](https://creativecommons.org/publicdomain/zero/1.0/); fetched at runtime | "Shipwrecks (worldwide): Wikidata (CC0)" — shown in-app |
+| **Wikidata — shipwrecks** (`query.wikidata.org/sparql`) | Shipwrecks layer: shipwreck items (Q852190) with a coordinate and at least one Wikipedia article, plus sinking events (Q906512, where the death toll lives): name, ship type, sinking date with its precision, deaths and survivors (counts only), description and article link. Keyless, fetched by `/api/shipwrecks` once a day | [CC0](https://creativecommons.org/publicdomain/zero/1.0/); fetched at runtime | "Shipwrecks (worldwide): Wikidata (CC0)" — shown in-app |
 | **InciWeb** (inciweb.wildfire.gov)                                    | Per-incident "InciWeb ↗" card links to official incident pages (narratives, evacuation/closure notices) | U.S. government public incident information. Links are matched best-effort by incident name and state, with incident page origin and update times checked on selection. Same-origin `/api/fire-perimeters/inciweb` routes cache the catalog for 1 hour and publication metadata for 30 minutes; linked pages remain InciWeb content | "Incident information: InciWeb (inciweb.wildfire.gov)" |
 | **FAA Special Use Airspace** (`services6.arcgis.com` FeatureServer `Special_Use_Airspace`) | Prohibited & Restricted Airspace layer: US prohibited (P) and restricted (R) special-use airspace polygons (not the UAS Facility Map or UAS flight restrictions), altitude limits from the `*_VAL`/`*_UOM`/`*_CODE` fields, times of use, and controlling agency | U.S. public domain (FAA aeronautical data published through the [FAA AIS Open Data portal](https://adds-faa.opendata.arcgis.com/)); fetched keyless through `/api/drone-airspace` (1-hour server cache). Informational only — not a substitute for official UAS flight-planning tools | "Prohibited & restricted airspace: FAA Special Use Airspace" |
 | **OpenFreeMap / OpenMapTiles** | Vector tiles | OpenStreetMap data under ODbL 1.0 | OpenFreeMap © OpenMapTiles |