Upgrade heatmaps stile Hotjar: movimenti mouse e anteprima pagina live.

Traccia i movimenti aggregati, overlay a gradienti sull’iframe della pagina e toggle click/move in admin.

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

backend/app/services/analytics/ingest.rb

@@ -2,8 +2,8 @@
 
 module Analytics
   class Ingest
-    MAX_BATCH = 50
-    RATE_LIMIT_PER_MINUTE = 60
+    MAX_BATCH = 80
+    RATE_LIMIT_PER_MINUTE = 90
 
     Result = Struct.new(:accepted, :rejected, :rate_limited, keyword_init: true)
 
@@ -62,11 +62,17 @@ module Analytics
       return nil if page_path.length > 200
 
       occurred_at = parse_time(data[:ts] || data[:occurred_at]) || Time.current
+      weight = data[:n].presence || data[:weight].presence || 1
+      weight = Integer(weight)
+      weight = 1 if weight < 1
+      weight = 500 if weight > 500
+
       attrs = {
         page_path: page_path,
         device: device,
         event_type: event_type,
         occurred_at: occurred_at,
+        weight: weight,
         x_pct: nil,
         y_pct: nil,
         scroll_pct: nil,
@@ -75,7 +81,7 @@ module Analytics
       }
 
       case event_type
-      when "click"
+      when "click", "move"
         x = clamp_pct(data[:x] || data[:x_pct])
         y = clamp_pct(data[:y] || data[:y_pct])
         return nil if x.nil? || y.nil?
@@ -92,6 +98,8 @@ module Analytics
       end
 
       attrs
+    rescue ArgumentError, TypeError
+      nil
     end
 
     def clamp_pct(value)