Assert Street Level expansion timeout and document provider precedence

docs/CURRENT-STATE.md

@@ -5,7 +5,10 @@ An explicit list replaces the default Mapillary provider; an empty list removes
 all imagery providers. Without that option, Mapillary is registered only when
 `sources.mapillary` is supplied. An absent source leaves Street Level registered
 with a truthful no-provider state, preserving layer controls and share tokens.
-Malformed supplied sources and provider definitions still fail validation.
+Malformed selected sources and provider definitions still fail validation.
+An explicit provider list bypasses the unused Mapillary source, including its
+validation. Layer share identities are preserved; custom provider switches require
+a corresponding serialization contract.
 
 ## God's Eye View in conversations — October 2, 2026
 

scripts/qa-street-level.mjs

@@ -622,11 +622,17 @@ async function main() {
       await target.click(
         '.panel-collapse-btn[data-collapse-target="street-level-panel"]',
       );
-      await settle(
-        target,
-        () =>
-          getComputedStyle(document.getElementById('sl-body')).display ===
-          'flex',
+      assert.ok(
+        await settle(
+          target,
+          () =>
+            !document
+              .getElementById('street-level-panel')
+              .classList.contains('collapsed') &&
+            getComputedStyle(document.getElementById('sl-body')).display ===
+              'flex',
+        ),
+        'Street Level panel did not expand before the timeout',
       );
     };
     await expandStrip();

src/app/layers/streetLevel.js

@@ -5,7 +5,11 @@ import * as picking from '../../data/pickRegistry.js';
 import * as input from '../../data/inputOwnership.js';
 import * as render from '../../renderGovernor.js';
 
-/** Inject providers, or use Mapillary only when its source is supplied. */
+/**
+ * Inject providers, or use Mapillary only when its source is supplied.
+ * An explicit provider list replaces the default; unused sources.mapillary is
+ * neither constructed nor validated, including when the list is empty.
+ */
 export function createApplicationStreetLevel({
   surface,
   sources = {},