test(mapillary): provider, source, presentation, markup and QA-harness coverage

scripts/qa-mapillary.mjs drives a real browser through the rail panel,
the keyless gate, coverage, a ready-made feature plan, the viewer and its
expanded dialog at 1440×900 and 1280×800.

Co-Authored-By: Claude Fable 5.1 <[email protected]>

src/tooling/transitQa.test.mjs

@@ -675,7 +675,7 @@ test('public transit documentation uses courtesy attribution and the approved gr
   );
   assert.ok(
     readme.includes(
-      'Fifteen layers and map sources. **Thirteen have a keyless path.**',
+      'Sixteen layers and map sources. **Thirteen have a keyless path.**',
     ),
   );
   assert.ok(