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.

package-lock.json

@@ -150,6 +150,7 @@
         "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",
@@ -11994,6 +11995,15 @@
         "react": "*"
       }
     },
+    "node_modules/react-image-crop": {
+      "version": "11.1.2",
+      "resolved": "https://registry.npmjs.org/react-image-crop/-/react-image-crop-11.1.2.tgz",
+      "integrity": "sha512-+0Pc2fxpwKL4u4oLmdKBw8XSwUceFbXbKEHvFOlsl/MGB1OVNic4uBlAPmEHGXYgoJIq+b63xHbc/aJMG0AVkA==",
+      "license": "ISC",
+      "peerDependencies": {
+        "react": ">=16.13.1"
+      }
+    },
     "node_modules/react-is": {
       "version": "16.13.1",
       "resolved": "https://registry.npmjs.org/react-is/-/react-is-16.13.1.tgz",