Allinea replay alla UI live e corregge miniature e loghi.

Player contenuto come la diretta, fix streaming thumbnail da S3, volume persistente ActiveStorage in produzione.

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

backend/app/services/recordings/serve_from_storage.rb

@@ -6,6 +6,8 @@ module Recordings
   # Serve file replay/thumbnail al browser senza esporre URL S3 interni (es. http://garage:3900).
   class ServeFromStorage
     CHUNK_SIZE = 256 * 1024
+    # Thumbnail e file piccoli: buffer completo (l'Enumerator su Puma può non completare la risposta).
+    SMALL_FILE_MAX = 2 * 1024 * 1024
 
     def initialize(key:, content_type:, disposition: "inline", filename: nil)
       @key = key
@@ -55,6 +57,15 @@ module Recordings
 
       controller.status = :partial_content if range.present? && resp.content_range.present?
 
+      if range.blank? && resp.content_length.to_i.positive? && resp.content_length.to_i <= SMALL_FILE_MAX
+        return controller.send_data(
+          resp.body.read,
+          type: @content_type,
+          disposition: @disposition,
+          filename: @filename
+        )
+      end
+
       body = resp.body
       controller.response_body = Enumerator.new do |yielder|
         while (chunk = body.read(CHUNK_SIZE))