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>

tests/page-smoke.js

@@ -1,4 +1,5 @@
-// Executes web/index.html's script against a stub DOM and fails on anything thrown.
+// Builds web/index.html from web/src as build.rs does, runs its script against a stub DOM,
+// and fails on anything thrown.
 //
 // This exists because a ReferenceError at load once blanked the whole UI: a patch
 // anchored on a function that no longer existed, so `prefsModal` was referenced but
@@ -6,13 +7,13 @@
 // and every server-side test passed too, because the server was fine.
 //
 //   node tests/page-smoke.js
-const fs = require('fs');
-const path = require('path');
 const vm = require('vm');
 
-const html = fs.readFileSync(path.join(__dirname, '..', 'web', 'index.html'), 'utf8');
+const { buildPage } = require('../web/build.mjs');
+// What ships: minified, so an id may have lost its quotes.
+const html = buildPage('index.html');
 const script = html.split('<script>')[1].split('</script>')[0];
-const ids = new Set([...html.matchAll(/id="([^"]+)"/g)].map(m => m[1]));
+const ids = new Set([...html.matchAll(/\bid=(?:"([^"]+)"|([^\s>"']+))/g)].map(m => m[1] || m[2]));
 
 const missing = [];
 const el = (name) => new Proxy({ style: { setProperty(){}, getPropertyValue(){ return ''; } }, dataset: {}, classList: { add(){}, remove(){}, toggle(){}, contains(){ return false; } },