The page's script is TypeScript in web/src, built and minified with swc

- web/src/*.ts: the script that was inline in index.html and login.html, split along its
  existing sections. Still one scope, concatenated in order, not modules.
- web/build.mjs strips the types, puts the script in the page and minifies it with swc;
  build.rs runs it into OUT_DIR and web.rs include_str!s the result. 137 KB -> 106 KB.
- npx tsc -p . type-checks web/src, loosely; the handful of annotations it needed
  change no behaviour.
- The Docker build installs node and swc (npm ci --omit=dev).
- Two list requests racing no longer let the older one win, and switching tabs clears
  the selection it closes, which made a browser test flaky.

Closes #23, #24.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

CHANGELOG.md

@@ -18,9 +18,13 @@ The long form, with what was wrong before and how it was found, is in
 - Add a feed asks only for the feed; Popular and Directory in the sidebar are where you browse.
 - On a phone, an item's files, with play and delete, sit above its show notes rather than below
   them, where long notes left them looking missing.
+- The page is served minified, about a quarter smaller. Its script is now TypeScript in
+  `web/src`, type-checked, and built with swc; building ipx needs node.
 
 ### Fixed
 
+- Switching tabs straight after marking everything read no longer shows the previous tab's
+  items: of two lists asked for at once, only the later one is shown.
 - An item you open stays read. A list refresh that crossed with marking it read could put its
   unread dot back until the next refresh.
 - On the Unread tab, the item you were reading leaves the list as soon as you move to the next