chore: fix some monorepo issues

[patosullivan]

• adds the build step back in for the shared package. we're going to want npm run dev in there so we can update files in there while working in dev on either app, afaict. updates gh workflows appropriately.
• fixes the import sort order issue. prettier rc had been updated to use @trivago/prettier-plugin-sort-imports and wasn't configured with our @/ root alias in mind. This made eslint mad every time you opened a file.

[alecananian]

Thanks! tsup.config.ts got removed in a merge: https://github.com/tloncorp/landscape-apps/blob/b3700b9f00da58ee358131487721f68bbe27c06f/packages/shared/tsup.config.ts
But the inline options on the build command achieve the same thing - looks good 👍