Fix: the server crashed on every Search; Search now covers tasks and events and explains itself

- Restore ddgAnswer, which an earlier edit deleted: /api/ddg threw a ReferenceError and killed the
  whole server process whenever Search ran
- One failing request can no longer take the server down (errors are logged and answered with a 500)
- tools/smoke-test.js starts the real server and calls every endpoint; the Gitea workflow runs it before
  building the image, so a missing function or a crash stops the build
- Search: also searches NE Hub tasks and calendar events; Seafile file search falls back to scanning file
  names when the search index returns nothing; Plex search falls back to the library's artists/albums;
  a status line shows what was searched, per-source counts and errors, with sign-in links

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

tasks.js

@@ -119,4 +119,12 @@ async function handle(req, res) {
   } catch (e) { json(res, 400, { error: e.message }); }
 }
 
-module.exports = { handle, parseTodos };
+/** Every task from every list (NE Hub and iCloud), with its list name. */
+async function allTasks() {
+  const d = load(), out = [];
+  for (const t of d.tasks) { const l = d.lists.find(x => x.id === t.list); out.push({ id: t.id, list: 'local:' + t.list, listName: l ? l.name : 'Tasks', title: t.title, notes: t.notes || '', due: t.due || '', done: !!t.done }); }
+  for (const l of caldav.todoLists()) { try { for (const r of await caldav.listTodoRaw(l.id)) for (const t of parseTodos(r.ics)) out.push({ ...t, list: l.id, listName: l.name, href: r.href, etag: r.etag }); } catch {} }
+  return out;
+}
+
+module.exports = { handle, parseTodos, allTasks };