fix: ended page scopes start no timers; SSH transfers keep their connection from the idle sweep; linked files download whole; only the sent item unpacks on an SSH host, replace and skip as on a machine

internal/server/web/static/app.js

@@ -15,24 +15,7 @@
 
   function register(name, mod) { modules[name] = mod; }
 
-  // scope gives a module timers, requests and listeners that end with it.
-  function scope() {
-    const timers = new Set(), offs = [], ac = new AbortController();
-    return {
-      timeout(fn, ms) { const id = setTimeout(() => { timers.delete(id); fn(); }, ms); timers.add(id); return id; },
-      interval(fn, ms) { const id = setInterval(fn, ms); timers.add(id); return id; },
-      clear(id) { clearTimeout(id); clearInterval(id); timers.delete(id); },
-      fetch(url, opt) {
-        const o = Object.assign({credentials: 'same-origin'}, opt || {});
-        // A request with its own signal ends on either.
-        o.signal = o.signal && AbortSignal.any ? AbortSignal.any([o.signal, ac.signal]) : (o.signal || ac.signal);
-        return fetch(url, o);
-      },
-      on(target, ev, fn, opt) { target.addEventListener(ev, fn, opt); offs.push(() => target.removeEventListener(ev, fn, opt)); },
-      signal: ac.signal,
-      end() { timers.forEach(id => { clearTimeout(id); clearInterval(id); }); timers.clear(); offs.forEach(f => f()); ac.abort(); }
-    };
-  }
+  const scope = WSUtil.scope;
 
   function unmount(area) {
     const m = mounted.get(area);