fix(street-level): a delayed photo never overrides newer navigation; retry failed mesh refreshes

- A photo takes a deferred navigation ticket when it starts opening
  (begin/reassert, the application's _beginDeferredNavigation and
  _reassertNavigationHandoff) and frames only if that ticket still owns
  the camera once loaded, so a slow photo no longer flies the camera back
  over newer navigation or clears newer aircraft tracking.
- A failed mesh refresh keeps the last good sample and the distance it was
  taken from, and is retried after the miss cooldown, instead of recording
  the failed distance and never refreshing again.

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

docs/CURRENT-STATE.md

@@ -2962,7 +2962,9 @@ camera, `meshSampler.js` samples the rendered surface (`scene.sampleHeight`,
 steep streets and roads under trees. It uses the mesh floor's rules (the
 visible tileset has finished streaming, a real bare-earth prior, the shared
 mesh window) and probes a cell again once the camera is half as far from it,
-down to 40 m, so coarse early samples are replaced as finer tiles load. Roads on elevated decks are still drawn at
+down to 40 m, so coarse early samples are replaced as finer tiles load. A
+failed probe keeps the last good sample and distance and is retried after the
+miss cooldown. Roads on elevated decks are still drawn at
 ground level. Framing a photo ignores mesh samples far below the bare earth
 (unloaded tiles).
 
@@ -2970,10 +2972,12 @@ The header pill is the layer switch. With one provider its chip is a layer
 switch too; with several, darkening the last lit chip turns the layer off. The
 viewer sits under the header with EXPAND, FIT/FILL, FOLLOW and close above the
 image. FOLLOW needs the Google 3D map stack (`attachMapStackController`) and
-stops when the stack changes. Framing a photo and turning FOLLOW on claim the
-camera through the application's navigation (`attachNavigation`), which
-releases aircraft and satellite tracking (and is refused in the cockpit);
-FOLLOW stops when another feature takes the camera. SINCE is a stepped slider whose readout names the
+stops when the stack changes. Camera moves go through the application's
+navigation (`attachNavigation`), which releases aircraft and satellite tracking
+and is refused in the cockpit: turning FOLLOW on claims the camera at once, and
+FOLLOW stops when another feature takes it; a photo takes a deferred ticket
+when it starts opening and frames only if nothing newer took the camera while
+it loaded. SINCE is a stepped slider whose readout names the
 cut-off date. The panel is portable (`street-level-panel` spec, minimum
 320 × 280, `dockOnCollapse`): a floating window gives spare height to the
 viewer, and collapsing it, double-clicking the header or SHRINK after EXPAND