feat: implement document upload functionality with dedicated UI, state management, and routing.

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

@@ -1050,6 +1050,14 @@
       "pending": "Pending",
       "missing": "Missing",
       "rejected": "Rejected"
+    },
+    "upload": {
+      "instructions": "Please select a valid PDF file to upload.",
+      "submit": "Submit Document",
+      "select_pdf": "Select PDF File",
+      "attestation": "I certify that this document is genuine and valid.",
+      "success": "Document uploaded successfully",
+      "error": "Failed to upload document"
     }
   },
   "staff_certificates": {

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

@@ -1050,6 +1050,14 @@
       "pending": "Pendiente",
       "missing": "Faltante",
       "rejected": "Rechazado"
+    },
+    "upload": {
+      "instructions": "Por favor selecciona un archivo PDF válido para subir.",
+      "submit": "Enviar Documento",
+      "select_pdf": "Seleccionar Archivo PDF",
+      "attestation": "Certifico que este documento es genuino y válido.",
+      "success": "Documento subido exitosamente",
+      "error": "Error al subir el documento"
     }
   },
   "staff_certificates": {