Feat v0.7.0 shell contract + surface audit + rebrand

Two-slot shell topbar (home, left, center, bell, user menu) with SDK API
(setLeft/setSlot/setTitle/hide/show). All 4 primary surfaces migrated:
Settings and Team Admin to Pattern B (flat tabs), Admin to Pattern C
(category tabs + sidebar), Docs to Pattern A (default).

Backend WS events: package.changed (broadcast), auth.changed (targeted),
notification.all_read. User menu re-fetches on package/auth changes.
Bell syncs read state across tabs.

Error handling pass with .sw-inline-error CSS primitive. Empty state
guidance for Admin Workflows/Groups. Announcement global dismiss via
localStorage. Rebrand assets deployed (both b/e icon variants, wordmarks,
full icon library). Docs outline scroll-to-heading fix.

Bug fixes: ICD security assertion tightened, workflow-demo error surfacing,
signoff display names, hello-dashboard + team-admin/groups.js deleted.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

server/handlers/notifications.go

@@ -137,10 +137,9 @@ func (h *NotificationHandler) MarkAllRead(c *gin.Context) {
 
 	// Sync badge across tabs
 	if h.hub != nil {
-		payload, _ := json.Marshal(map[string]string{"action": "mark_all_read"})
 		h.hub.PublishToUser(userID, events.Event{
-			Label:   "notification.read",
-			Payload: payload,
+			Label:   "notification.all_read",
+			Payload: events.MustJSON(map[string]string{}),
 			Ts:      time.Now().UnixMilli(),
 		})
 	}