ivnites: use actual inviteDTO for DOMInvite

no intermediary parsing step. Also, moved the date -> duration (3mo6d3h
sorta thing) to the web, there's now a ValidTill field with a unix
timestamp. Used the new Temporal api with a polyfill. Bumped api version
(although it still isn't semver).

package-lock.json

@@ -30,6 +30,7 @@
         "remixicon": "^4.3.0",
         "remove-markdown": "^0.5.0",
         "tailwindcss": "^3.3.2",
+        "temporal-polyfill": "^0.3.0",
         "typescript": "^5.1.3",
         "uncss": "^0.17.3"
       },
@@ -6755,6 +6756,21 @@
         "node": ">=8.0"
       }
     },
+    "node_modules/temporal-polyfill": {
+      "version": "0.3.0",
+      "resolved": "https://registry.npmjs.org/temporal-polyfill/-/temporal-polyfill-0.3.0.tgz",
+      "integrity": "sha512-qNsTkX9K8hi+FHDfHmf22e/OGuXmfBm9RqNismxBrnSmZVJKegQ+HYYXT+R7Ha8F/YSm2Y34vmzD4cxMu2u95g==",
+      "license": "MIT",
+      "dependencies": {
+        "temporal-spec": "0.3.0"
+      }
+    },
+    "node_modules/temporal-spec": {
+      "version": "0.3.0",
+      "resolved": "https://registry.npmjs.org/temporal-spec/-/temporal-spec-0.3.0.tgz",
+      "integrity": "sha512-n+noVpIqz4hYgFSMOSiINNOUOMFtV5cZQNCmmszA6GiVFVRt3G7AqVyhXjhCSmowvQn+NsGn+jMDMKJYHd3bSQ==",
+      "license": "ISC"
+    },
     "node_modules/terser": {
       "version": "5.43.1",
       "resolved": "https://registry.npmjs.org/terser/-/terser-5.43.1.tgz",