feat(oxibadge): add month-confirmation flow and fetch records/employees

Adds the screen after onboarding: pick a month/year (ConfirmMonth), show
loading screens while the device is queried, then download that month's
records and resolve each distinct employee's name, printing both to
stdout (debug pretty-print) before landing on the placeholder "done"
screen.

- r701: RecordIterator's boxed stream is now Send, required for it to
  cross into a Tauri command's future.
- oxibadge: load_records/load_employees commands, sharing the existing
  3-retry connect_with_retries helper. load_records uses skip_while/
  take_while on the device's newest-first stream to grab only the
  target month without walking its whole history, then a single
  collect + in-place Vec::reverse() back to chronological order.
- Shared LoadingScreen/Intro components extracted so future screens
  reuse the same look without duplicating markup/CSS.

Assisted-by: Claude Sonnet 5 <noreply@anthropic.com>

oxibadge/src/lib/locales/it.json

@@ -19,6 +19,25 @@
       "unknown": "Errore di connessione"
     }
   },
+  "confirm_month": {
+    "title": "Conferma del mese",
+    "subtitle": "Stai per confermare le timbrature di questo mese. Tocca il mese o l'anno per cambiarli.",
+    "change_month_aria": "Mese: {month}, cambia",
+    "change_year_aria": "Anno: {year}, cambia",
+    "close_aria": "Chiudi selezione",
+    "choose_month_aria": "Scegli il mese",
+    "choose_year_aria": "Scegli l'anno",
+    "month_option_aria": "{month} {year}",
+    "button": "Vai alle timbrature"
+  },
+  "loading_records": {
+    "title": "Scarico le timbrature...",
+    "description": "Sto leggendo dal timbratore le timbrature di <strong>{period}</strong>. Può richiedere qualche secondo."
+  },
+  "loading_employees": {
+    "title": "Recupero i dipendenti...",
+    "description": "Sto leggendo i nomi dei dipendenti registrati sul timbratore. Ci vuole solo un attimo."
+  },
   "done": {
     "message": "Non c'è niente da fare."
   }