test(street-level): close the mutation survivors; Esc in rich text

A mutation review left 18 earlier survivors; each now has a test that
fails with the mutant applied:

- the expanded viewer returns into the panel on shrink, close and destroy
  (the fake DOM had no parentNode, so reinsertion was never exercised); the
  fake DOM gains offsetParent and a MutationObserver that honours its
  options, and a <body> child added while expanded goes inert;
- each pose moves the marker, drives FOLLOW and selects a new sequence;
  close() retires an open still mounting or opening; a provider toggled
  while the layer is off activates nothing; the adapter drops late and
  superseded poses;
- share-link defaults: "any date" (0 days), the codec max pinned to the
  filter's MAX_SINCE_DAYS (layerState cannot import it across package
  boundaries, so a test ties the two), Mapillary on when a link omits it;
- Esc that something else handled, or typed in a field, keeps the
  selection; a key problem outranks LOADING on the pill;
- the marker's terrain height (mesh, DEM, clamp then re-place);
- proxy: LRU memory cache and its half-budget rule, Retry-After capped,
  a request after a cancelled fetch starts a fresh one;
- date-line tile ranking with and without focus; the horizon cull idles
  while the camera stands still; the old zoom goes as soon as the new one
  lands; a rate limit holds every refresh inside its wait.

One real bug found and fixed: Esc inside a contenteditable cleared the
selected sequence (selection.js now ignores isContentEditable targets).

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

src/ui/streetLevelPresentation.test.mjs

@@ -100,6 +100,23 @@ test('a key Mapillary rejected reads KEY REJECTED and names the fix (review IC8
   assert.equal(view.providers[0].title, `Mapillary: ${error}`);
 });
 
+test('a key problem outranks loading on the pill: KEY REJECTED, then KEY REQUIRED (M65)', () => {
+  // A keyless provider can still report loading (its status check, a retry):
+  // the pill must say what is wrong, not that something is on its way.
+  const loading = { enabled: true, coverage: { loading: true } };
+  assert.equal(
+    presentStreetLevelPanel(snapshot({ ...loading, keyRequired: true })).status
+      .text,
+    'KEY REQUIRED',
+  );
+  assert.equal(
+    presentStreetLevelPanel(
+      snapshot({ ...loading, keyRequired: true, keyRejected: true }),
+    ).status.text,
+    'KEY REJECTED',
+  );
+});
+
 test('the header pill is the on/off switch and reads OFF, LOADING or ON', () => {
   assert.deepEqual(presentStreetLevelPanel(snapshot()).status, {
     text: 'OFF',