authjs svelte cloudflare-workers login works locally but not on prod

Problem: npm run dev (aka vite dev) login works as expected

npm run build && npm run preview login is broken/weird

production deploy login is weird

expected:

scenario: login on homepage GIVEN not logged in WHEN visit homepage WHEN do login WHEN refresh page (a bug, which requires to refresh) THEN avatar img and sign-out link are visible

scenario: logout on homepage GIVEN logged in WHEN visit homepage WHEN do logout WHEN refresh page (a bug, which requires to refresh) THEN sign-in link is visible

scenario: login on protected page GIVEN logged in WHEN visit protected page WHEN do login WHEN refresh page (a bug, which requires to refresh) WHEN visit homepage THEN avatar img and sign-out link are visible

actual:

FAIL: scenario: login on homepage FAIL: scenario: login on homepage SUCCESS: scenario: login on homepage

solution:

delete src/routes/+page.ts

// since there's no dynamic data here, we can prerender  
// it so that it gets served as a static asset in production  
export const prerender = true;

with login stuff, this home page is no longer a static asset!

(still have this refresh bug, where clicking login/logout does not reload the page)