feat: Add two-factor authentication via TOTP

Adds TOTP setup with QR code, login challenge, recovery codes and
trusted devices that let a browser skip the second factor for 30
days. Admins can reset another user's second factor by confirming
with their own password.

client/package-lock.json

@@ -58,6 +58,7 @@
         "patch-package": "^8.0.1",
         "photoswipe": "^5.4.4",
         "prop-types": "^15.8.1",
+        "qrcode.react": "^4.2.0",
         "react": "18.2.0",
         "react-beautiful-dnd": "^13.1.1",
         "react-datepicker": "^9.1.0",
@@ -14345,6 +14346,15 @@
       ],
       "license": "MIT"
     },
+    "node_modules/qrcode.react": {
+      "version": "4.2.0",
+      "resolved": "https://registry.npmjs.org/qrcode.react/-/qrcode.react-4.2.0.tgz",
+      "integrity": "sha512-QpgqWi8rD9DsS9EP3z7BT+5lY5SFhsqGjpgW5DY/i3mK4M9DTBNz3ErMi8BWYEfI3L0d8GIbGmcdFAS1uIRGjA==",
+      "license": "ISC",
+      "peerDependencies": {
+        "react": "^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0"
+      }
+    },
     "node_modules/qs": {
       "version": "6.15.3",
       "resolved": "https://registry.npmjs.org/qs/-/qs-6.15.3.tgz",