Rendi affidabile pausa con slate e conferma i controlli laterali.

Evita buchi HLS/YouTube in pausa (path slate ricreata, reload player, no patch recording inutili) e richiede conferma su tasti laterali app/regia.

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

backend/spec/services/mediamtx/publisher_sync_spec.rb

@@ -27,6 +27,8 @@ RSpec.describe Mediamtx::PublisherSync do
     allow(Mediamtx::PublisherOnline).to receive(:active?).and_return(true)
     allow_any_instance_of(described_class).to receive(:redis).and_return(redis)
     allow(client).to receive(:set_path_recording)
+    allow(client).to receive(:ensure_path_with_slate!)
+    allow(client).to receive(:set_always_available)
   end
 
   it "abilita la registrazione quando il publisher è online e la sessione è live" do