fix(street-level): address gekh's review of #768

P0
- tileMath: lonToTileX(180) wrapped to column 0, so a whole-world view at
  z1 loaded only the western column; 180 is now the last column.
- coverage.loadTile: a superseded request (after a retire or clear) still
  deleted the newer request's pending entry and loading count in `finally`,
  letting a duplicate load attach lines that nothing could remove. Only the
  request that still owns the key attaches its tile or settles the key.

P1
- view/tileMath: a view across the date line read as a ~358 deg box and
  loaded tiles on the far side of the globe. visibleBbox now returns
  west > east for such views and tilesForBbox splits them at +/-180;
  viewCentre averages across the line.
- decode: the parts of a multi-line sequence were joined into one line,
  drawing straight segments over capture gaps. Each part is now its own
  line (`parts`); later parts carry `~n` in their pick id, and picking or
  recolouring any part acts on the whole sequence.
- viewerHost: a prewarmed MapillaryJS viewer was never destroyed, leaking
  its WebGL context. Prewarmed adapters are tracked and released on
  unmount, at once when the layer went off mid-load, and per provider when
  only that provider is switched off.
- nearestImage took the first record the API returned; it now takes the
  closest one that passes the filter.

P2
- groundCast: the cache was cleared after a request counted its corners,
  dropping ones it relied on; it is now cleared first.
- streetLevelControls: the viewer was resized on every render (every frame
  while a panorama is dragged); the ResizeObserver handles size changes and
  the viewer is resized once when it opens. The legend now rebuilds when its
  entries change, not only their count.
- panelPositionControls: the portable-panel paths this PR added called the
  CCTV viewport sync directly; they go through onPanelResized, which the
  shell routes to CCTV. The "Compose camera panel controls" JSDoc is back on
  _initCctvPanel.

New tests: zoom-1 columns, date-line tiles and bbox, multi-part decode and
part pick ids, nearest image, prewarmed viewer release, and the cache
ordering (fails on the old order).

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

src/ui/applicationShell.js

@@ -933,7 +933,7 @@ export class StyleManager extends ShellFacade {
     return this._runExplicitNavigation('camera', () => focus(cameraId));
   }
 
-  /** Compose camera panel controls from the existing camera port and application actions. */
+  /** Compose the Street Level panel controls from its layer and application actions. */
   _initStreetLevelPanel() {
     const { streetLevelLayer } = this.services;
     this._streetLevelControls?.destroy();
@@ -959,6 +959,7 @@ export class StyleManager extends ShellFacade {
     this._streetLevelControls.connect();
   }
 
+  /** Compose camera panel controls from the existing camera port and application actions. */
   _initCctvPanel() {
     const { cctvLayer } = this.services;
     this._cctvControls?.destroy();
@@ -1506,6 +1507,7 @@ export class StyleManager extends ShellFacade {
    * @returns {void}
    */
   _onPanelResized(panelId) {
+    if (panelId === 'cctv-panel') this._syncCctvPanelViewport();
     if (panelId === 'street-level-panel')
       this._streetLevelControls?.onPanelResized();
   }