Add multi-day entries and area stay blocks

Entries gain an optional inclusive end_date (backfilled via migration): flights and travel longer than 24h show a continuation marker on following days, and a new stay entry type marks a time frame in one area (e.g. 3 days Venice) rendered as continuous bands across the calendar weeks. Stays feed the map route as stops; the route summary gains stays count and a chronological areas list with day spans. 49 API tests.

public/js/views/summary.js

@@ -34,6 +34,7 @@ export function renderSummary(tctx) {
     tile('🚗', s.travelLegs, 'Travel legs'),
     tile('📍', s.activities, 'Activities'),
     s.rentals > 0 ? tile('🚙', s.rentals, s.rentals === 1 ? 'Rental' : 'Rentals') : null,
+    s.stays > 0 ? tile('🏙️', s.stays, s.stays === 1 ? 'Stay' : 'Stays') : null,
   );
   section.appendChild(tiles);
 
@@ -71,6 +72,17 @@ export function renderSummary(tctx) {
   if (breakdown.childElementCount) kmBlock.appendChild(breakdown);
   section.appendChild(kmBlock);
 
+  const areas = s.areas || [];
+  if (areas.length) {
+    const areaBlock = el('div', { class: 'loc-block' }, el('h3', {}, 'Areas'));
+    const ul = el('ul', { class: 'area-list' });
+    for (const a of areas) {
+      ul.appendChild(el('li', {}, `🏙️ ${a.name} — ${a.days} ${a.days === 1 ? 'day' : 'days'}`));
+    }
+    areaBlock.appendChild(ul);
+    section.appendChild(areaBlock);
+  }
+
   const locations = s.locations || [];
   const locBlock = el('div', { class: 'loc-block' }, el('h3', {}, 'Locations in order'));
   if (!locations.length) {