fix(planner): trip places in every manual location field, never at 0,0

The trip's places went into the field's search results as they were. A place
without a pin was picked as 0,0, because Number(null) is a finite 0, and a
highlight left over from a longer search could point past the shorter list
and throw on Enter. The phone's form, the train stations and the car stops
were not offered the places at all.

The places are now prepared once per form (named, with a real coordinate,
each once) and handed to every location field of the manual tab, on the
desktop and on the phone. The field shows them while it is empty or holds
fewer than three characters, narrowed by what was typed, and derives that
list rather than writing it into the search results, so a late search answer
cannot replace it and a place already picked does not reopen it.

client/src/mobile/screens/trip/sheets/MTransportFormSheet.tsx

@@ -1,4 +1,4 @@
-import { useEffect, useRef, useState } from 'react'
+import { useEffect, useMemo, useRef, useState } from 'react'
 import { Bike, Bus, Car, CarTaxiFront, Check, ChevronDown, ChevronUp, Plane, Plus, Route, Sailboat, Ship, Train, TrainFront, TramFront, Trash2, X } from 'lucide-react'
 import MSheet from '../../../components/MSheet'
 import { useAddonStore } from '../../../../store/addonStore'
@@ -11,6 +11,7 @@ import CustomTimePicker from '../../../../components/shared/CustomTimePicker'
 import { BookingCodeInput } from '../../../../components/shared/BookingCode'
 import AirportSelect, { type Airport } from '../../../../components/Planner/AirportSelect'
 import LocationSelect, { type LocationPoint } from '../../../../components/Planner/LocationSelect'
+import { toLocationPicks } from '../../../../components/Planner/locationPicks'
 import TransitSearchPanel from '../../../../components/Planner/TransitSearchPanel'
 import { Eyebrow, FIELD_AREA_CLS, FIELD_CLS, FormSheetFooter, FormSheetHeader } from './PlSheetChrome'
 import PlFileAttach from './PlFileAttach'
@@ -158,6 +159,8 @@ export default function MTransportFormSheet({ planner, onOpenExpense }: MTranspo
 
   const isBudgetEnabled = useAddonStore(s => s.isEnabled('budget'))
   const tripHasDates = Boolean(trip?.start_date && trip?.end_date)
+  // The trip's places, offered by every location field of the manual tab (#2468).
+  const locationPicks = useMemo(() => toLocationPicks(places), [places])
 
   const [form, setForm] = useState({ ...EMPTY })
   const [automated, setAutomated] = useState(false)
@@ -850,7 +853,7 @@ export default function MTransportFormSheet({ planner, onOpenExpense }: MTranspo
                           <div className="mb-[8px] flex items-center gap-2">
                             <span className="flex-none font-geist text-[0.625rem] font-bold uppercase tracking-[.09em] text-m-faint">{roleLabel}</span>
                             <div className="min-w-0 flex-1">
-                              <LocationSelect value={wp.location} onChange={l => updateWp({ location: l || null })} />
+                              <LocationSelect value={wp.location} onChange={l => updateWp({ location: l || null })} places={locationPicks} />
                             </div>
                             {!isFirst && !isLast && (
                               <button type="button" onClick={() => setTrainWaypoints(prev => prev.filter((_, j) => j !== i))} aria-label={t('common.delete')} className="flex-none text-m-faint">
@@ -928,9 +931,9 @@ export default function MTransportFormSheet({ planner, onOpenExpense }: MTranspo
               <>
                 {/* From / To endpoints (non-flight / non-train) */}
                 <Eyebrow className="mb-[5px] mt-3 uppercase">{t('reservations.meta.from')}</Eyebrow>
-                <LocationSelect value={fromPick.location || null} onChange={l => setFromPick({ location: l || undefined })} />
+                <LocationSelect value={fromPick.location || null} onChange={l => setFromPick({ location: l || undefined })} places={locationPicks} />
                 <Eyebrow className="mb-[5px] mt-3 uppercase">{t('reservations.meta.to')}</Eyebrow>
-                <LocationSelect value={toPick.location || null} onChange={l => setToPick({ location: l || undefined })} />
+                <LocationSelect value={toPick.location || null} onChange={l => setToPick({ location: l || undefined })} places={locationPicks} />
 
                 {/* Stops along the drive — cars only (#1797). The rental frame above stays the
                     pick-up and return; these are the places in between, in order. */}
@@ -969,6 +972,7 @@ export default function MTransportFormSheet({ planner, onOpenExpense }: MTranspo
                             <LocationSelect
                               value={stop.location}
                               onChange={l => setCarStops(prev => prev.map((s, j) => (j === i ? { ...s, location: l || null } : s)))}
+                              places={locationPicks}
                             />
                           </div>
                           <div className="w-[92px] shrink-0">