Resolve the remaining client type errors and the trip.title navbar bug

Drive the client typecheck to zero without any/ts-ignore: convert the tripId route param to a number once at the page boundary so it matches the numeric props and store actions it feeds, fix trip.name -> trip.title (the wire field is title, so the old read rendered blank in the files/offline views), and tighten the scattered handler-arity, DOM-cast and untyped-payload sites. No runtime behaviour change.

client/src/components/Planner/PlaceInspector.tsx

@@ -102,10 +102,10 @@ interface PlaceInspectorProps {
   onClose: () => void
   onEdit: () => void
   onDelete: () => void
-  onAssignToDay: (placeId: number, dayId: number) => void
-  onRemoveAssignment: (assignmentId: number, dayId: number) => void
+  onAssignToDay: (placeId: number, dayId?: number) => void
+  onRemoveAssignment: (dayId: number, assignmentId: number) => void
   files: TripFile[]
-  onFileUpload?: (fd: FormData) => Promise<void>
+  onFileUpload?: (fd: FormData) => Promise<unknown>
   tripMembers?: TripMember[]
   onSetParticipants: (assignmentId: number, dayId: number, participantIds: number[]) => void
   onUpdatePlace: (placeId: number, data: Partial<Place>) => void
@@ -175,7 +175,7 @@ export default function PlaceInspector({
       for (const file of selectedFiles) {
         const fd = new FormData()
         fd.append('file', file)
-        fd.append('place_id', place.id)
+        fd.append('place_id', String(place.id))
         await onFileUpload(fd)
       }
       setFilesExpanded(true)