refactor(street-level): drop openNearest; QA opens a photo by clicking a line then a cone

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

scripts/fixtures/street-level/mapillaryGraph.mjs

@@ -27,15 +27,6 @@ export const THUMB_HOST = 'qa-fixture.mapillary.com';
 
 const METRES_PER_DEG_LAT = 110_540;
 
-/** Ground distance in metres, as the app's metresBetween. */
-export function metresApart(a, b) {
-  const lat = (((a.lat + b.lat) / 2) * Math.PI) / 180;
-  return Math.hypot(
-    (b.lon - a.lon) * 111_320 * Math.cos(lat),
-    (b.lat - a.lat) * METRES_PER_DEG_LAT,
-  );
-}
-
 /**
  * Photos along PHOTO_LINE, south to north; every third one is a panorama.
  * @returns {Array<{id: string, lon: number, lat: number, isPano: boolean, capturedAt: number, compassAngle: number}>}
@@ -181,18 +172,6 @@ export function answerMapillaryRequest({ method, url, images }) {
         : [];
       return { ...json(200, { data }), known: true };
     }
-    if (q.has('lat') && q.has('lng')) {
-      const at = { lat: Number(q.get('lat')), lon: Number(q.get('lng')) };
-      const radius = Math.min(50, Number(q.get('radius')) || 50);
-      const limit = Number(q.get('limit')) || 10;
-      // In no particular order, as the real API answers.
-      const data = photos
-        .filter((image) => metresApart(at, image) <= radius)
-        .reverse()
-        .slice(0, limit)
-        .map((image) => withFields(imageRecord(image), fields));
-      return { ...json(200, { data }), known: true };
-    }
     if (q.has('s2')) return { ...json(200, { data: [] }), known: true };
     return {
       ...json(400, { error: 'unsupported images query' }),