fix(street-level): four regressions from the merge review

- The selected sequence is drawn past the per-tile caps again, and its
  highlight takes every loaded part, drawn or not: in a dense tile a
  clicked Mapillary or Panoramax line kept its cones but lost its line.
- photoViewer tries :fullscreen and :popover-open one at a time, each in
  its own try: Safari before 16.4 parses neither, and the fallback threw
  on every flat KartaView or Panoramax photo.
- A lit Street View off Google 3D says it needs the Google 3D map again,
  instead of "every provider is switched off".
- Chips carry their provider colour again (--chip-color, as on main).

Each comes with the test that reproduced it.

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

src/ui/chipGroup.js

@@ -28,6 +28,17 @@ export function syncChipGroup(container, chips = [], { before = null } = {}) {
       `data-toggle-chip chip-${state}${chip.active ? ' active' : ''}`,
     );
     set(button, 'textContent', chip.label);
+    // Optional per-chip colour; CSS decides how it is used.
+    const color = chip.color || '';
+    if ((button.dataset.chipColor || '') !== color) {
+      if (color) {
+        button.style.setProperty('--chip-color', color);
+        button.dataset.chipColor = color;
+      } else {
+        button.style.removeProperty('--chip-color');
+        delete button.dataset.chipColor;
+      }
+    }
     set(button, 'title', chip.title || '');
     set(button, 'disabled', Boolean(chip.disabled));
     attribute(button, 'aria-pressed', String(Boolean(chip.active)));