fix(street-level): /revmain cleanup after the slim rebuild

- Google 3D: the OPEN button re-measures a ground whose tiles are still
  loading (a few times, a second apart) and on a map change, not only
  after the next camera move.
- Mapillary: two mounts on one host during the first download share one
  build instead of leaking a second WebGL viewer.
- Retired floating-panel keys (v8 panelPos, panelFloatHintShown) are
  dropped from localStorage; dead inline-position resets, the drag JSDoc
  and the dead qa-ui-disposal observer branch are gone.
- Docs: z ladder, panel chrome, position storage and the fixture gate's
  actual coverage; changelog fragment for #974 (old .gev-cache/mapillary
  can be deleted).
- ru/es: the layer is named as everywhere else in the UI.
- Fixtures and test fakes: unused exports removed; a fake credit removal
  of an absent credit no longer drops another one; the tile test reset
  frees upstream slots.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

scripts/fixtures/street-level/kartaView.mjs

@@ -49,11 +49,6 @@ export function resetKartaViewFixture() {
   nearestLookups = 0;
 }
 
-/** Nearest lookups answered since the last reset (the first got a 429). */
-export function kartaViewLookups() {
-  return nearestLookups;
-}
-
 /** The drive's photos, south to north; every tenth is 360°, every odd one archived. */
 export function kartaViewPhotos() {
   const step = KV_SPACING_M / METRES_PER_DEG_LAT;

scripts/fixtures/street-level/panoramax.mjs

@@ -28,7 +28,7 @@ export const PNX_PARK = Object.freeze({
   height: 700,
   pitch: -1.4,
 });
-export const PNX_CREATOR = 'Fixture Mapper';
+const PNX_CREATOR = 'Fixture Mapper';
 const PNX_SPACING_M = 10;
 const METRES_PER_DEG_LON = 111_320 * Math.cos((PNX_LINE.lat * Math.PI) / 180);
 const API = 'https://api.panoramax.xyz/api';

scripts/format-scope.json

@@ -281,6 +281,7 @@
   "src/ui/applicationShell.js",
   "src/ui/panelLayoutController.js",
   "src/ui/panelPositionControls.js",
+  "src/ui/panelPositionControls.test.mjs",
   "src/ui/recordingControls.js",
   "src/ui/shellElements.js",
   "src/ui/shellFeedback.js",

scripts/qa-ui-disposal.mjs

@@ -43,11 +43,7 @@ try {
     const fpsReadout = document.querySelector('.frame-rate-readout');
     const fpsWasVisible = fpsReadout && !fpsReadout.hidden;
     const watchObserver = (name) => {
-      const owner =
-        name === '_draggableResizeObserver'
-          ? ui._panelPosition
-          : ui._panelLayout;
-      const observer = owner[name];
+      const observer = ui._panelLayout[name];
       if (!observer) return false;
       const disconnect = observer.disconnect.bind(observer);
       counts[name] = 0;
@@ -59,7 +55,6 @@ try {
     };
     const observed = [
       '_commandDockTrayObserver',
-      '_draggableResizeObserver',
       '_leftStackResizeObserver',
       '_rightStackResizeObserver',
       '_leftStackMutationObserver',
@@ -193,11 +188,7 @@ try {
               counts[field] === 1 && ui._contextControls[field] === null,
           ),
         observersReleased: observed.every(
-          (name) =>
-            counts[name] === 1 &&
-            (name === '_draggableResizeObserver'
-              ? ui._panelPosition
-              : ui._panelLayout)[name] === null,
+          (name) => counts[name] === 1 && ui._panelLayout[name] === null,
         ),
         subscriptionReleased:
           counts.cctv === 1 && ui._cctvControls._cctvUnsubscribe === null,