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/Packing/PackingListPanel.tsx

@@ -732,10 +732,10 @@ interface MenuItemProps {
   icon: React.ReactNode
   label: string
   onClick: () => void
-  danger: boolean
+  danger?: boolean
 }
 
-function MenuItem({ icon, label, onClick, danger }: MenuItemProps) {
+function MenuItem({ icon, label, onClick, danger = false }: MenuItemProps) {
   return (
     <button onClick={onClick} style={{
       display: 'flex', alignItems: 'center', gap: 8, width: '100%',