Tasks tab: NE Hub lists plus iCloud reminder lists where Apple exposes them

- Lists, quick add, due dates, notes, complete/reopen, delete; Home card for overdue/due today
- iCloud VTODO lists read and written over CalDAV (If-Match, edits patch the latest copy so
  priority/alarms survive); NE Hub lists work regardless
- Fix: text inside a nested VALARM was read as the task's / event's own description and then
  written back on edit; nested components are now skipped (regression tests added)

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

cal.js

@@ -95,11 +95,14 @@ function parseDuration(v) {
 }
 
 function parseEvents(text) {
-  const events = []; let cur = null;
+  const events = []; let cur = null, depth = 0;
   for (const line of unfold(text)) {
-    if (line === 'BEGIN:VEVENT') { cur = { ex: [] }; continue; }
+    if (line === 'BEGIN:VEVENT') { cur = { ex: [] }; depth = 0; continue; }
     if (line === 'END:VEVENT') { if (cur && cur.start) events.push(cur); cur = null; continue; }
     if (!cur) continue;
+    if (/^BEGIN:/.test(line)) { depth++; continue; } // skip nested VALARM so its DESCRIPTION/SUMMARY never replaces the event's
+    if (/^END:/.test(line)) { depth--; continue; }
+    if (depth > 0) continue;
     const l = parseLine(line); if (!l) continue;
     switch (l.name) {
       case 'DTSTART': cur.start = parseDate(l.value, l.params); break;
@@ -336,4 +339,4 @@ async function handle(req, res) {
   } catch (e) { json(res, 400, { error: e.message }); }
 }
 
-module.exports = { handle, feed, parseEvents, expand, zonedToUtc, assertPublic, localIcs };
+module.exports = { unfold, parseLine, parseDate, unesc, handle, feed, parseEvents, expand, zonedToUtc, assertPublic, localIcs };