feat: add staff documents feature with document card and progress card

- Implemented DocumentCard widget to display individual staff documents with status and actions.
- Created DocumentsProgressCard widget to show overall verification progress of documents.
- Established StaffDocumentsModule for dependency injection and routing to documents page.
- Updated pubspec.yaml and pubspec.lock for new dependencies and configurations.

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

@@ -581,5 +581,24 @@
         }
       }
     }
+  },
+  "staff_documents": {
+    "title": "Documents",
+    "verification_card": {
+      "title": "Document Verification",
+      "progress": "$completed/$total Complete"
+    },
+    "list": {
+        "empty": "No documents found",
+        "error": "Error: $message"
+    },
+    "card": {
+        "view": "View",
+        "upload": "Upload",
+        "verified": "Verified",
+        "pending": "Pending",
+        "missing": "Missing",
+        "rejected": "Rejected"
+    }
   }
 }