After step 2 deployed the IIFE-wrapped bundles, m's browser still saw
the broken page because /assets/projects.js was being served from the
local HTTP cache (no Cache-Control, just heuristic freshness from
Last-Modified). Even after the new SW activated and cleared its own
caches, its cacheFirst handler did `fetch(req)` which goes through the
browser HTTP cache — re-fed the SW cache from the stale bundle and the
loop perpetuated forever.
Three mutually reinforcing fixes:
1. SW cacheFirst now does `fetch(req, { cache: "reload" })` for the
network leg. Forces the network fetch to bypass the browser's HTTP
cache, so the SW always seeds its own cache from a true network read.
2. Go static handlers for /assets/* and /icons/* set
`Cache-Control: no-cache, must-revalidate`. Combined with the
Last-Modified that http.FileServer already emits, browsers send
If-Modified-Since and the server replies 304 when unchanged — fast
for repeat loads, fresh on every deploy. Users without a SW (or after
the kill-switch unregistered theirs) now also pick up new bundles
immediately.
3. pwa-install.ts gates the install banner on
`(min-width: 768px)` — same breakpoint the BottomNav and other
mobile-shell elements use. Desktop partners no longer get an install
prompt covering their work area.
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