fix(street-level): IC8 review of KartaView — cones on the right page, pano sizing

P1s from the correctness review, each with a regression test:
- Cones showed the wrong page of a long sequence (cache keyed by
  sequence; no re-centre after a close or a same-drive line click):
  KartaView always reselects, and re-centres whenever a photo of the
  selected sequence opens on another page.
- A 360° photo's first frame was one colour: the canvas was sized while
  hidden (1×1). It is shown first, and re-measured every frame.

P2/P3s: a storage timeout or 5xx is not remembered as archived (only
403/404/409/410 are); dense z13 tiles draw up to 1,600 lines (a third of
downtown Detroit was cut); decoded tiles are kept 10 min; a timed-out tile
is asked once more; pages are 250 photos and the newest page request goes
first; a photo far past deleted ones, or unlisted at a page edge, still
finds its neighbours; a step that gets no answer is not the end; a lost
WebGL context redraws the photo, and a failed one is retried on the next
mount; the first flat image comes from the proxy (KartaView's own can be
1.7 MB); fileurl fallbacks must be https storage hosts; oversized answers
are refused; keyboard (Shift+← →, ↑ ↓, + −) and pinch look around a
panorama; focus stays in the viewer when a step button disables. Docs:
share links with 0.m.0, keyless count, CURRENT-STATE matched to the code.

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

src/layers/streetLevel/providers/kartaview/panorama.js

@@ -136,7 +136,8 @@ export function createPanoramaRenderer(canvas) {
   let frame = 0;
   const view = { yaw: 0, pitch: 0, fov: PANO_FOV_DEFAULT_DEG };
 
-  function resize() {
+  /** Match the drawing buffer to the canvas's laid-out size. */
+  function syncSize() {
     const ratio = Math.min(globalThis.devicePixelRatio || 1, 2);
     const width = Math.max(1, Math.round(canvas.clientWidth * ratio));
     const height = Math.max(1, Math.round(canvas.clientHeight * ratio));
@@ -144,12 +145,18 @@ export function createPanoramaRenderer(canvas) {
       canvas.width = width;
       canvas.height = height;
     }
+  }
+
+  function resize() {
+    syncSize();
     scheduleRender();
   }
 
   function draw() {
     frame = 0;
     if (gl.isContextLost()) return;
+    // Every frame: the canvas may have been laid out since the last one.
+    syncSize();
     gl.viewport(0, 0, canvas.width, canvas.height);
     gl.clearColor(0, 0, 0, 1);
     gl.clear(gl.COLOR_BUFFER_BIT);