Tint sidebar widget chips by origin; fix widgetSub host

README.md

@@ -276,7 +276,8 @@ in three kinds:
   next upcoming release that carries artwork also gets a full-width hero tile
   above the groups (its relayed thumb plus title and date), ringed in the same
   origin hue. Each widget gets its own sidebar button for a
-  single-widget view.
+  single-widget view, its left edge tinted with the same origin hue once the
+  widget has returned rows (an errored or empty widget stays accent-blue).
 - Writes are admin-only when OIDC is on, reads any session - same gate as
   services.