Instructions for making Ionic / Angular / Firebase hosting PWA are not correct?

Ionic Framework Ionic Angular
1

I am attempting to re-make an updated version of my PWA app with modern versions of Angular, Ionic, and Firebase. I am failing to get a PWA at actually gets recognized as a PWA so it can be installed, with custom desktop icons, etc.

The page https://ionicframework.com/docs/angular/pwa on how to do this seems out of date, but I did the best I could with it, and things seem to still not work – in the end my firebase hosted Ionic app is just not recognized as a PWA, and Chrome does not offer to install it as such.

I’ve recreated the issue using the most minimal setup I could. The github repo is here.

In the repo, my README.md documents the steps I took.

Ionic Info:

ionic info
[WARN] Error loading @capacitor/ios package.json: Error: Cannot find module '@capacitor/ios/package.json'

       Require stack:
       - /Users/vtn2/.nvm/versions/node/v20.9.0/lib/node_modules/@ionic/cli/lib/project/index.js
       - /Users/vtn2/.nvm/versions/node/v20.9.0/lib/node_modules/@ionic/cli/lib/index.js
       - /Users/vtn2/.nvm/versions/node/v20.9.0/lib/node_modules/@ionic/cli/index.js
       - /Users/vtn2/.nvm/versions/node/v20.9.0/lib/node_modules/@ionic/cli/bin/ionic
[WARN] Error loading @capacitor/android package.json: Error: Cannot find module '@capacitor/android/package.json'

       Require stack:
       - /Users/vtn2/.nvm/versions/node/v20.9.0/lib/node_modules/@ionic/cli/lib/project/index.js
       - /Users/vtn2/.nvm/versions/node/v20.9.0/lib/node_modules/@ionic/cli/lib/index.js
       - /Users/vtn2/.nvm/versions/node/v20.9.0/lib/node_modules/@ionic/cli/index.js
       - /Users/vtn2/.nvm/versions/node/v20.9.0/lib/node_modules/@ionic/cli/bin/ionic

Ionic:

   Ionic CLI                     : 7.2.0 (/Users/vtn2/.nvm/versions/node/v20.9.0/lib/node_modules/@ionic/cli)
   Ionic Framework               : @ionic/angular 8.4.3
   @angular-devkit/build-angular : 19.1.5
   @angular-devkit/schematics    : 19.1.5
   @angular/cli                  : 19.1.5
   @ionic/angular-toolkit        : 12.1.1

Capacitor:

   Capacitor CLI      : 7.0.1
   @capacitor/android : not installed
   @capacitor/core    : 7.0.1
   @capacitor/ios     : not installed

Utility:

   cordova-res : not installed globally
   native-run  : 2.0.1

System:

   NodeJS : v20.9.0 (/Users/vtn2/.nvm/versions/node/v20.9.0/bin/node)
   npm    : 10.1.0
   OS     : macOS Unknown

If anyone has recently created a PWA with custom icons, I’d appreciate any insight you can give me.