fix(street-level): a sequence that fails to load opens the panel too

A Mapillary line click loads the sequence's cones, not a photo: when the
Graph API refused them, the error went to sequence.error, which the new
auto-open did not watch, so with the panel collapsed the click seemed to do
nothing. The panel now opens for an open error or a sequence error alike.

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

docs/CURRENT-STATE.md

@@ -3539,8 +3539,9 @@ image; FIT/FILL starts at FIT each session. IMAGERY and FIT/FILL are rows of
 toggle buttons (`aria-pressed`), each its own tab stop. SINCE is a select of
 the nine windows; a link's day count between them gets its own option, and
 the tooltip names the cut-off date. The panel opens by itself only when a
-photo opens or fails to (a click on the map or a line would otherwise load
-it, or its error, out of sight), never when the layer is switched on.
+photo opens, or a click fails to open one or to load its sequence (the
+result, or its error, would otherwise be out of sight), never when the layer
+is switched on.
 
 MapillaryJS loads on the first photo. Opening one frames it with a single
 camera flight through the application's deferred navigation (`begin` /