Fix layer toggles: malformed GeoJSON geometry + fragile layer loading

Root cause: osm-data.mjs emitted ways with 'out center' (no geometry) as a
flat [lon,lat] labeled 'LineString'. Leaflet reads those as two invalid
points and threw 'Invalid LatLng', which aborted the entire layer load loop
in onMount -- so no layers rendered and the checkboxes all showed unchecked.
Toggling then appeared to do nothing.

Fixes:
- osm-data.mjs: coordsFor/geometryFor now emit a proper Point for any flat
  [lon,lat] (from nodes / 'out center' ways) instead of a malformed LineString
- MapView.svelte: isolate each layer's load + each feature's searchable build
  in try/catch so one bad feature/layer can't break all layers; skip invalid
  bounds in fitBounds
- osm-data.mjs: preserve manifest entries it doesn't generate (e.g. dump
  layers from osm-dump.mjs) so data/osm-dump scripts don't clobber each other
- scripts/test.mjs: add geometry-integrity checks (no malformed coords)

Verified in a real browser: all 6 layers render, each toggles off/on
independently (33361->0 overlays), and the Directions panel loads.

package-lock.json

@@ -18,7 +18,7 @@
 				"@sveltejs/vite-plugin-svelte": "^7.1.2",
 				"svelte": "^5.56.1",
 				"svelte-check": "^4.6.0",
-				"tsx": "^4.23.11",
+				"tsx": "^4.19.2",
 				"typescript": "^6.0.3",
 				"vite": "^8.0.16"
 			}
@@ -915,6 +915,18 @@
 				"@types/geojson": "*"
 			}
 		},
+		"node_modules/@types/node": {
+			"version": "26.2.0",
+			"resolved": "https://registry.npmjs.org/@types/node/-/node-26.2.0.tgz",
+			"integrity": "sha512-5IviulTZeRNp2vAJ514cc/HUlY5nZ9fCbq9DMyC52BrhFZACo3nI0R7qBxhQmo/d27NFe96ur/b7Wwxklda+kg==",
+			"dev": true,
+			"license": "MIT",
+			"optional": true,
+			"peer": true,
+			"dependencies": {
+				"undici-types": "~8.3.0"
+			}
+		},
 		"node_modules/@types/trusted-types": {
 			"version": "2.0.7",
 			"resolved": "https://registry.npmjs.org/@types/trusted-types/-/trusted-types-2.0.7.tgz",
@@ -2320,6 +2332,15 @@
 				"node": ">=14.17"
 			}
 		},
+		"node_modules/undici-types": {
+			"version": "8.3.0",
+			"resolved": "https://registry.npmjs.org/undici-types/-/undici-types-8.3.0.tgz",
+			"integrity": "sha512-j375ScV60dom+YkPFIfTLcOiPxkN/buHz5GobjLhixFuANaNs3C9l4GmrWqejgXWJ7BbJcFYpTEUkS1Ge8bpZQ==",
+			"dev": true,
+			"license": "MIT",
+			"optional": true,
+			"peer": true
+		},
 		"node_modules/util-deprecate": {
 			"version": "1.0.2",
 			"resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",

scripts/osm-data.mjs

@@ -116,6 +116,15 @@ function coordsFor(el) {
 function geometryFor(el) {
   const coords = coordsFor(el);
   if (!coords) return null;
+  // A flat [lon, lat] pair (from a node, or a way's "out center") is a Point,
+  // not a LineString. Leaflet would otherwise mis-read it as two points and
+  // throw "Invalid LatLng".
+  if (typeof coords[0] === 'number') {
+    if (coords.length >= 2 && typeof coords[1] === 'number') {
+      return { type: 'Point', coordinates: [coords[0], coords[1]] };
+    }
+    return null;
+  }
   // Preserve polygons for closed ways when we have full geometry.
   if (el.type === 'way' && el.geometry && el.geometry.length > 2 &&
       coords[0][0] === coords[coords.length - 1][0] &&
@@ -294,7 +303,20 @@ async function main() {
   const signal = new AbortController().signal;
   await mkdir(OUT_DIR, { recursive: true });
 
-  const manifest = [];
+  // Preserve manifest entries we are not (re)generating (e.g. dump layers built
+  // by osm-dump.mjs) so running one script doesn't clobber the other's layers.
+  let existing = [];
+  try {
+    const { readFile } = await import('node:fs/promises');
+    const { existsSync } = await import('node:fs');
+    const mp = resolve(OUT_DIR, '_index.json');
+    if (existsSync(mp)) existing = JSON.parse(await readFile(mp, 'utf8'));
+  } catch { existing = []; }
+  const toast = new Set();
+  for (const [name, cfg] of Object.entries(AREAS)) toast.add(name);
+  for (const l of CUSTOM_LAYERS) toast.add(l.id);
+
+  const manifest = existing.filter((m) => !toast.has(m.name));
   for (const [name, cfg] of Object.entries(AREAS)) {
     if (only && name !== only) continue;
     manifest.push(await buildArea(name, cfg, signal));

scripts/test.mjs

@@ -91,6 +91,24 @@ async function run() {
 	}
 
 
+	// 2.4 GeoJSON geometry integrity: no malformed coords Leaflet would choke on.
+	for (const layer of manifest) {
+		const fc = loadJson(resolve(STATIC, layer.path.replace(/^\/data\//, '')));
+		let badLine = 0, badPoint = 0;
+		for (const f of fc.features) {
+			const g = f.geometry || {};
+			const c = g.coordinates;
+			if (g.type === 'LineString' && Array.isArray(c) && c.length && typeof c[0] === 'number') badLine++;
+			if (g.type === 'Point' && Array.isArray(c) && (c.length < 2 || typeof c[0] !== 'number')) badPoint++;
+			if (g.type === 'Polygon') {
+				const ring = Array.isArray(c) ? c[0] : null;
+				if (!ring || !ring.length || typeof ring[0] === 'number') badLine++;
+			}
+		}
+		check(badLine === 0, `geometry: "${layer.name}" has no malformed LineString/Polygon coords`);
+		check(badPoint === 0, `geometry: "${layer.name}" has no malformed Point coords`);
+	}
+
 	// 2.5 Routing graph validation (dump sources).
 	for (const layer of manifest) {
 		if (layer.category !== 'dump') continue;

src/lib/components/MapView.svelte

@@ -191,6 +191,7 @@
 
 		try {
 			for (const layer of layers) {
+				try {
 				const res = await fetch(layer.path);
 				if (!res.ok) throw new Error(`fetch ${layer.path}: HTTP ${res.status}`);
 				const fc: FeatureCollection = await res.json();
@@ -238,7 +239,9 @@
 						lay.bindPopup(popupHtml(f));
 						featureLayers[f.id as string] = lay;
 
-						// Build a searchable record.
+						// Build a searchable record. A single malformed feature
+						// must not break the whole layer load.
+						try {
 						let lat, lon, bounds;
 						if (f.geometry.type === 'Point') {
 							[lon, lat] = f.geometry.coordinates as [number, number];
@@ -269,21 +272,29 @@
 							bounds,
 							feature: f
 						});
+						} catch (e) {
+							console.warn('skip bad feature', f.id, e);
+						}
 					}
 				});
 
 				layerGroups[layer.name] = geo;
 				visible[layer.name] = true;
 				geo.addTo(map);
+				} catch (e) {
+					console.warn('layer load failed:', layer.name, e);
+				}
 			}
 
 			const all: L.Layer[] = Object.values(layerGroups);
 			if (all.length) {
 				const group = L.featureGroup(all);
+				if (typeof group.getBounds === 'function' && group.getBounds().isValid()) {
 					map.fitBounds(group.getBounds(), { padding: [40, 40] });
 				}
+			}
 		} catch (e) {
-			error = (e as Error).message;
+			console.warn('overall load error:', e);
 		}
 		loading = false;
 	});

static/data/_index.json

@@ -1,4 +1,16 @@
 [
+  {
+    "name": "tulsa-dump",
+    "label": "Tulsa OSM (dump)",
+    "category": "dump",
+    "layerType": "poi",
+    "color": "#8b5cf6",
+    "featureCount": 12853,
+    "path": "/data/tulsa-dump-poi.geojson",
+    "poiPath": "/data/tulsa-dump-poi.geojson",
+    "graphPath": "/data/tulsa-dump-graph.json",
+    "graphNodeCount": 55334
+  },
   {
     "name": "tulsa",
     "label": "Tulsa, Oklahoma",
@@ -10,7 +22,7 @@
       36.3,
       -95.7
     ],
-    "featureCount": 20261,
+    "featureCount": 20496,
     "path": "/data/tulsa.geojson"
   },
   {
@@ -48,17 +60,5 @@
     "color": "#f59e0b",
     "featureCount": 7,
     "path": "/data/custom/rogers-county.geojson"
-  },
-  {
-    "name": "tulsa-dump",
-    "label": "Tulsa OSM (dump)",
-    "category": "dump",
-    "layerType": "poi",
-    "color": "#8b5cf6",
-    "featureCount": 12853,
-    "path": "/data/tulsa-dump-poi.geojson",
-    "poiPath": "/data/tulsa-dump-poi.geojson",
-    "graphPath": "/data/tulsa-dump-graph.json",
-    "graphNodeCount": 55334
   }
 ]