Adds missing check for typescript types to app ci (#1198)

* fix app types and add a ci check

* fix lint check.

.github/workflows/mobile-ci.yml

@@ -86,6 +86,9 @@ jobs:
       - name: Run prettier
         run: yarn fmt
         working-directory: ./app
+      - name: Check App Types
+        run: yarn types
+        working-directory: ./app
       - name: Check license headers
         run: node scripts/check-license-headers.mjs --check
         working-directory: ./