feat: add separate sound beep test button + always show move modal on open

- Add testSound() function: plays AudioContext beep independently of TTS
- Add '🔔 Esegui Test Suono' button in TTS settings (above voice test btn)
- Add translations: settings.tts.test_sound_btn (it/en/de)
- Remove hasOtherLocs guard in showMoveAfterUseModal: always show
  location-choice modal when opening a package, regardless of whether
  the product already exists in other locations (e.g. peas only in pantry
  → user can now choose to move opened portion to fridge)

translations/it.json

@@ -693,6 +693,7 @@
             "extra_fields_label": "➕ Campi extra (JSON)",
             "extra_fields_placeholder": "{\"entity_id\": \"media_player.living_room\"}",
             "extra_fields_hint": "Campi aggiuntivi da includere nel payload, in formato JSON. Lascia vuoto se non necessario.",
+            "test_sound_btn": "🔔 Esegui Test Suono",
             "test_btn": "🔊 Invia Test Vocale",
             "voices_loading": "Caricamento voci…",
             "voice_not_supported": "Voce non supportata dal browser",