fix: enforce type checking on commit time

packages/hoppscotch-app/package.json

@@ -25,6 +25,7 @@
     "lintfix": "pnpm run lintfix:script && pnpm run lintfix:style",
     "test": "jest",
     "do-dev": "pnpm run dev",
+    "do-typecheck": "pnpx tsc --noEmit",
     "do-build-prod": "pnpm run generate",
     "do-prod-start": "pnpm run start",
     "do-lint": "pnpm run lint",
@@ -146,6 +147,7 @@
     "@types/httpsnippet": "^1.23.1",
     "@types/lodash": "^4.14.179",
     "@types/lossless-json": "^1.0.1",
+    "@types/paho-mqtt": "^1.0.6",
     "@types/postman-collection": "^3.5.7",
     "@types/splitpanes": "^2.2.1",
     "@types/uuid": "^8.3.4",