feat(roadtrip): add a stop by hand in the form the rest of TREK adds places in

The dialog built for this last round was its own thing and showed it: the
suggestion list was barely legible, clipped at the bottom, and never more
than two rows tall. It also lacked most of what the ordinary add-place form
has had for years.

So it is gone, and "Add manually" opens that form instead, in a service-stop
mode. The category control becomes the kind of stop and the time spent
there, the costs section is dropped, and an "Add between" row says where on
the drive it goes. Everything else comes along rather than being rebuilt:
the typed-ahead search with its source marks, the coordinate fields for a
charger no index knows, address, website, phone, notes, times, files and the
duplicate check. With the mode absent the form is the same component it was,
which its own suites still pin.

Where the stop lands is worked out when it is saved rather than when the
form opens, because the coordinate only exists once a place has been chosen.
One function answers both what the select shows and where the stop goes, so
the two cannot disagree, and the write goes through the same assignment path
as every other insert, via re-anchoring included: a stop pushed into a day
shifts every via anchored at or after it, and without re-anchoring first the
drawn road runs forward, doubles back and runs out again.

The select recommends rather than merely offering. Every leg of every routed
day is measured against the place separately and they are listed nearest
first, each with its own distance, so the preselected one visibly is the
closest and overruling it is an informed choice. The word they all shared
moved into the caption.

A stop with no position at all is not filed on a drive by guesswork. It
keeps its kind and goes to the trip's places, and the form says so and says
how to change it.

shared/src/i18n/ar/roadtrip.ts

@@ -203,6 +203,8 @@ const roadtrip: TranslationStrings = {
   'roadtrip.poi.manualOffRoute': '{distance} عن المسار، لذا تحقق من المرحلة التي تناسبها.',
   'roadtrip.poi.manualAppend': 'لا يوجد مسار بعد، لذا تُضاف في نهاية اليوم {number}.',
   'roadtrip.poi.manualNoResults': 'لم يُعثر على أي مكان.',
+  'roadtrip.poi.manualNoCoords':
+    'بدون موضع، يُضاف هذا إلى أماكن الرحلة بدلاً من إحدى مراحل القيادة. اختر نتيجة من البحث أعلاه، أو أدخل الإحداثيات.',
   'roadtrip.summary.distance': 'المسافة',
   'roadtrip.summary.driving': 'مدة القيادة',
   'roadtrip.alt.ask': 'مسارات أخرى',