fix(globe): Navara redraws after a map change while its tiles arrive

Phase-4 QA: after a map-stack switch at the whole-globe view Navara
sometimes showed the new map only seconds later. Navara 0.2.1 reports idle
and stops drawing before a raster tile it fetched arrives, so the last
frame stays stale until something else asks for one. Every engine.maps
change (base imagery, terrain, photoreal tiles, their release) now asks for
a frame and keeps asking every 250 ms for 6 s, then the engine idles again.

scripts/qa-map-switch.mjs switches the stack (photoreal / Esri / OSM) at
18 000 km on each engine, waits for the tiles, hashes the picture, forces
frames and hashes again: a change means a stale picture. Before: Navara 3/8
switches drew the new picture by themselves; after: Navara 8/8, Cesium 8/8.

scripts/format-scope.json

@@ -1108,5 +1108,6 @@
   "src/app/layers/qaSources.js",
   "src/app/layers/qaSources.test.mjs",
   "scripts/qa-w1-layers.mjs",
-  "src/bench/w1Feeds.js"
+  "src/bench/w1Feeds.js",
+  "scripts/qa-map-switch.mjs"
 ]