Merge origin/main: Google Street View, KartaView and Panoramax on the slim Street Level

Main gained three imagery providers (Google Street View, KartaView,
Panoramax), shared line-coverage, cone and photo-viewer modules, one source
lit at a time and the translated interface. Their shared modules still
carried what this branch removes, so the merge ports them onto it:

- lineCoverage.js is this branch's coverage.js made provider-neutral
  (draped lines near the ground only, the selection drawn over them, key
  and rate-limit blocking); sequenceCones.js is sequences.js the same way.
  Mapillary, KartaView and Panoramax all build on them; Mapillary moves
  back to providers/mapillary/ beside the others.
- No ground casting, mesh sampling, surface modes, FOLLOW, legend, prewarm,
  orbit overview points (Panoramax's density dots included), stale-tile
  swaps or water-filled point budget come back.
- Kept from main because the new providers need them: requiresMapStack and
  attachMapStackController (Street View on Google 3D only), ground clicks,
  openNearest with an optional provider nearestImage, openImage {frame},
  reportError, the view-cone marker (now an SVG glyph), filters /
  coverageLabel / sinceBasis, OPEN STREET VIEW, keyAlternatives and i18n.
- photoViewer.js treats the viewer as expanded when its wrap is full screen
  or the iPhone popover, as EXPAND now is.
- The fixture browser gate keeps its 8 steps and adds one each for
  KartaView and Panoramax; catalogs, docs, boundaries and format scope
  follow.

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

src/ui/rightPanelRail.js

@@ -69,8 +69,17 @@ export function layoutRightPanelRail({
   // A collapse may schedule one follow-up, which only measures and allocates.
   const isCollapseRetry = pendingCollapseRetries.delete(stack);
 
+  // Other CSS may hide a panel, such as an event view: it is not laid out.
+  // Exclusive presentation hides collapsed panels itself; those stay in the
+  // rail so they can be restored.
+  const hiddenByRail = (panel) =>
+    stack.classList.contains('layout-exclusive') &&
+    panel.classList.contains('collapsed');
   const panels = [...stack.children].filter(
-    (panel) => panel.matches('[data-panel-id]') && !panel.hidden,
+    (panel) =>
+      panel.matches('[data-panel-id]') &&
+      !panel.hidden &&
+      (hiddenByRail(panel) || getComputedStyle(panel).display !== 'none'),
   );
   if (!hud.visible || hud.variant !== 'tactical') {
     for (const panel of panels.filter((item) =>