feat: optimize routes around accommodation, confirm note deletions (#1123)

Optimize day routes around the accommodation

When a day has an accommodation set, the route optimizer now treats it as
the day's home base: it optimizes a loop that leaves the hotel and returns
to it, so the stop nearest the hotel comes first. On a transfer day -
checking out of one hotel and into another - the route runs from the first
hotel to the second instead.

The optimizer also gained a 2-opt pass on top of the nearest-neighbor
ordering, which removes the crossings the greedy pass used to leave behind.
A new display setting ("optimize route from accommodation", on by default)
lets you turn the anchoring off.

Confirm before deleting notes

Deleting a plan note or a collab note now asks for confirmation first. On
phones and tablets the edit and delete icons sit close together and were
easy to mis-tap, which deleted notes with no way back.

shared/src/i18n/en/settings.ts

@@ -64,6 +64,9 @@ const settings: TranslationStrings = {
   'settings.bookingLabelsHint':
     'Show station / airport names on the map. When off, only the icon is shown.',
   'settings.blurBookingCodes': 'Blur Booking Codes',
+  'settings.optimizeFromAccommodation': 'Optimize route from accommodation',
+  'settings.optimizeFromAccommodationHint':
+    'When optimizing a day, start the route at the hotel you wake up in and end it at the one you check into that evening.',
   'settings.notifications': 'Notifications',
   'settings.notifyTripInvite': 'Trip invitations',
   'settings.notifyBookingChange': 'Booking changes',