feat: use postal mime parser

frontend/app/package.json

@@ -90,6 +90,7 @@
     "@openstapps/core": "workspace:*",
     "@transistorsoft/capacitor-background-fetch": "5.2.0",
     "@types/dom-view-transitions": "1.0.4",
+    "asn1js": "^3.0.5",
     "capacitor-secure-storage-plugin": "0.9.0",
     "cordova-plugin-calendar": "5.1.6",
     "date-fns": "3.6.0",
@@ -98,6 +99,8 @@
     "geojson": "0.5.0",
     "ionic-appauth": "0.9.0",
     "jsonpath-plus": "6.0.1",
+    "libbase64": "^1.3.0",
+    "libqp": "^2.1.0",
     "maplibre-gl": "4.0.2",
     "material-symbols": "0.17.1",
     "moment": "2.30.1",
@@ -113,6 +116,7 @@
     "semver": "7.6.0",
     "swiper": "8.4.5",
     "tslib": "2.6.2",
+    "zod": "^3.23.8",
     "zone.js": "0.14.4"
   },
   "devDependencies": {
@@ -145,6 +149,7 @@
     "@types/fontkit": "2.0.7",
     "@types/geojson": "1.0.6",
     "@types/glob": "8.1.0",
+    "@types/imapflow": "1.0.18",
     "@types/jasmine": "5.1.4",
     "@types/jasminewd2": "2.0.13",
     "@types/jsonpath": "0.2.0",