Split Open Map Overlays into Sea Marks and Ski Pistes layers

Each overlay is now its own Infrastructure row instead of a chip on one
shared row: sea-marks (token 6) and ski-pistes (token 7), both
enabled-only, built by createOsmOverlayLayers() from one descriptor
list. Drops the option group and its share-codec defaults, gives each
layer its own name, voice entry and CURRENT-STATE row, and shifts the
token-ledger fixtures to the next free digit 8.

src/voice/actionSchemas.test.mjs

@@ -48,7 +48,7 @@ test('the complete Realtime tool payload pins the manifest-generated layer relea
     // Snow leaves the set_visual_style enum.
     // The Operator HUD layout leaves set_hud's layout enum.
     // The layer alias hint leaves out aliases the layer id already spells.
-    'b59bf989c98cb5935b628dd9c586f303f3e1e7febb8aac83f479fd60ec023bbc',
+    'c13f59886cce3780e7b27462df19659242fdac98928289dce74cf61a1f74054a',
   );
 });
 

src/voice/layerManifest.js

@@ -72,21 +72,16 @@ const layers = [
     noQuery: 'published third-party intel placemarks; not analyst records',
   },
   {
-    id: 'osm-overlays',
-    aliases: [
-      'open map overlays',
-      'map overlays',
-      'sea marks',
-      'seamarks',
-      'nautical charts',
-      'openseamap',
-      'ski pistes',
-      'ski slopes',
-      'snow map',
-      'opensnowmap',
-    ],
+    id: 'sea-marks',
+    aliases: ['seamarks', 'nautical charts', 'buoys', 'openseamap'],
     context: false,
-    noQuery: 'raster tile overlays; no countable records',
+    noQuery: 'raster tile overlay; no countable records',
+  },
+  {
+    id: 'ski-pistes',
+    aliases: ['ski slopes', 'ski runs', 'snow map', 'opensnowmap'],
+    context: false,
+    noQuery: 'raster tile overlay; no countable records',
   },
   {
     id: 'flights',