feat: complete centralized error handling system with documentation

apps/mobile/packages/core_localization/lib/src/l10n/en.i18n.json

@@ -680,7 +680,8 @@
     "title": "Shifts",
     "tabs": {
       "my_shifts": "My Shifts",
-      "find_work": "Find Work"
+      "find_work": "Find Shifts",
+      "history": "History"
     },
     "list": {
       "no_shifts": "No shifts found",
@@ -735,7 +736,7 @@
   },
   "errors": {
     "auth": {
-      "invalid_credentials": "The email or password you entered is incorrect.",
+      "invalid_credentials": "Invalid verification code or password. Please try again.",
       "account_exists": "An account with this email already exists. Try signing in instead.",
       "session_expired": "Your session has expired. Please sign in again.",
       "user_not_found": "We couldn't find your account. Please check your email and try again.",

apps/mobile/packages/core_localization/lib/src/l10n/es.i18n.json

@@ -680,7 +680,8 @@
     "title": "Turnos",
     "tabs": {
       "my_shifts": "Mis Turnos",
-      "find_work": "Buscar Trabajo"
+      "find_work": "Buscar Trabajo",
+      "history": "Historial"
     },
     "list": {
       "no_shifts": "No se encontraron turnos",