Aggiunge grafico andamento visite in admin Analytics.

Serie giornaliera di pageview/click/movimenti nel periodo filtrato, sopra la tabella pagine.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/app/controllers/admin/analytics_controller.rb

@@ -36,6 +36,23 @@ module Admin
           max_scroll: max_scroll_by_path[path].to_i
         }
       end.sort_by { |r| [-r[:pageviews], -r[:moves], -r[:clicks], r[:page_path]] }
+
+      pageviews_by_day = scope.group(:day).sum(:pageview_count)
+      clicks_by_day = cell_scope.group(:day).sum(:click_count)
+      moves_by_day = cell_scope.group(:day).sum(:move_count)
+      @trend = (@filters[:from]..@filters[:to]).map do |day|
+        {
+          day: day.iso8601,
+          pageviews: pageviews_by_day[day].to_i,
+          clicks: clicks_by_day[day].to_i,
+          moves: moves_by_day[day].to_i
+        }
+      end
+      @trend_totals = {
+        pageviews: @trend.sum { |r| r[:pageviews] },
+        clicks: @trend.sum { |r| r[:clicks] },
+        moves: @trend.sum { |r| r[:moves] }
+      }
     end
 
     def show