feat: add screenshot capture to Copy Agent page

Staff can now capture their screen via the browser's Screen Capture
API, crop the result, name the file, and save it directly to a
selected patient's Cloud Storage attachments folder.

apps/Frontend/package.json

@@ -76,6 +76,7 @@
     "react-dom": "^19.1.0",
     "react-hook-form": "^7.55.0",
     "react-icons": "^5.4.0",
+    "react-image-crop": "^11.1.2",
     "react-resizable-panels": "^2.1.7",
     "recharts": "^2.15.2",
     "socket.io-client": "^4.8.1",