Banner: adapt expired icon/color/title to safety level (non-alarmist)

- ok level (long-life/freezer safe): green banner, ✅ icon, 'Scaduto (ancora ok)'
- warning level: amber banner, 👀 icon, 'Scaduto (controlla)'
- danger level: unchanged red 🚫 banner
- Added banner-expired-ok / banner-expired-warning CSS variants
- Added expiry.expired_suffix_ok / expired_suffix_warning i18n keys (IT/EN/DE)
- Updated README and CHANGELOG

translations/de.json

@@ -641,6 +641,8 @@
         "expired_today_long": "Heute abgelaufen",
         "expired_ago_long": "Seit {n} Tagen abgelaufen",
         "expired_suffix": "— Abgelaufen!",
+        "expired_suffix_ok": "— Abgelaufen (noch ok)",
+        "expired_suffix_warning": "— Abgelaufen (erst prüfen)",
         "days_compact": "{n}T"
     },
     "status": {

translations/en.json

@@ -640,6 +640,8 @@
         "expired_today_long": "Expired today",
         "expired_ago_long": "Expired {n} days ago",
         "expired_suffix": "— Expired!",
+        "expired_suffix_ok": "— Expired (still ok)",
+        "expired_suffix_warning": "— Expired (check first)",
         "days_compact": "{n}d"
     },
     "status": {

translations/it.json

@@ -640,6 +640,8 @@
         "expired_today_long": "Scaduto oggi",
         "expired_ago_long": "Scaduto da {n} giorni",
         "expired_suffix": "— Scaduto!",
+        "expired_suffix_ok": "— Scaduto (ancora ok)",
+        "expired_suffix_warning": "— Scaduto (controlla)",
         "days_compact": "{n}gg"
     },
     "status": {