Use a neutral compact switch codec and clarify provider size limits

src/layers/streetLevel/registry.js

@@ -1,4 +1,4 @@
-import { encodeProviderSwitches } from './providerSwitches.js';
+import { encodeIdSwitches } from '../../data/idSwitches.js';
 
 /**
  * The contract an imagery provider registers with the Street Level layer.
@@ -128,7 +128,18 @@ export function validateProviders(providers) {
     prefixes.push(provider.pickPrefix);
   }
   // Validate the complete bounded share field once, before any instance exists.
-  encodeProviderSwitches(providers.map(({ id }) => [id, true]));
+  try {
+    encodeIdSwitches(
+      providers
+        .filter(({ id }) => id !== 'mapillary')
+        .map(({ id }) => [id, true]),
+    );
+  } catch (error) {
+    if (!(error instanceof RangeError)) throw error;
+    throw new RangeError(
+      'Street Level provider IDs cannot fit in the 256-character share-link field; use shorter IDs or fewer providers',
+    );
+  }
   return Object.freeze([...providers]);
 }