ui: F1 — populate OpenAlerts in baseView so nav badge updates everywhere

Flagged in review of 35dee98: the Alerts tab badge should show the
open count from any page, not just /alerts. baseView now takes the
request and queries store.ListAlerts(Status: "open") to fill
view.OpenAlerts on every page render. All call sites updated.

internal/server/http/ui_repo.go

@@ -244,7 +244,7 @@ func (s *Server) handleUIHostRepo(w stdhttp.ResponseWriter, r *stdhttp.Request)
 		return
 	}
 	page.SavedSection = r.URL.Query().Get("saved")
-	view := s.baseView(u)
+	view := s.baseView(r, u)
 	view.Title = host.Name + " repo · restic-manager"
 	view.Page = *page
 	if err := s.deps.UI.Render(w, "host_repo", view); err != nil {
@@ -268,7 +268,7 @@ func (s *Server) renderRepoPage(w stdhttp.ResponseWriter, r *stdhttp.Request, u
 	page.AdminCredsError = adminErr
 	page.BandwidthError = bwErr
 	page.MaintenanceError = mntErr
-	view := s.baseView(u)
+	view := s.baseView(r, u)
 	view.Title = host.Name + " repo · restic-manager"
 	view.Page = *page
 	w.WriteHeader(stdhttp.StatusUnprocessableEntity)