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_notifications.go

@@ -108,8 +108,8 @@ func (s *Server) loadSettingsPage(r *stdhttp.Request) (*settingsPage, error) {
 
 // renderSettingsPage renders the settings shell, setting HTTP 422 on
 // validation failure (pass status=0 for the normal 200).
-func (s *Server) renderSettingsPage(w stdhttp.ResponseWriter, _ *stdhttp.Request, u *ui.User, page *settingsPage, status int) {
-	view := s.baseView(u)
+func (s *Server) renderSettingsPage(w stdhttp.ResponseWriter, r *stdhttp.Request, u *ui.User, page *settingsPage, status int) {
+	view := s.baseView(r, u)
 	view.Title = "Settings · restic-manager"
 	view.Active = "settings"
 	view.Page = *page