fix(client): stop shared items counting towards the recipient bag weight

An item shared through the sharing tier is visible to its recipients but
carried by its owner. The bag totals filtered on bag_id alone, so every
recipient saw the owner's weight added to their own load — which is exactly
the situation that tier exists for (one person brings the first-aid kit).

Filtering by owner_id, as the issue suggests, would have broken more than it
fixed: owner_id is stamped on every item including Common ones, so the group
pool would have shrunk to "only what I entered myself" even on trips where
nobody shares anything. The predicate keeps the Common pool intact and drops
only private items owned by someone else.

Closes #1767

client/src/mobile/screens/trip/tabs/MBagsSheet.tsx

@@ -7,7 +7,7 @@ import { avatarSrc } from '../../../../utils/avatarSrc'
 import type { PackingBag, PackingItem, TripMember } from '../../../../types'
 import type { TripPlanner } from '../MTripShell'
 import { formatWeight, packingItemWeight } from './listsModel'
-import { bagFillPct } from '../../../../components/Packing/packingListPanel.helpers'
+import { bagFillPct, countsTowardsMyLoad } from '../../../../components/Packing/packingListPanel.helpers'
 
 export interface MBagsSheetProps {
   planner: TripPlanner
@@ -17,6 +17,8 @@ export interface MBagsSheetProps {
   items: PackingItem[]
   tripMembers: TripMember[]
   canEdit: boolean
+  /** Who is looking — decides whose load the weights describe (#1767). */
+  currentUserId?: number | null
   onCreateBag: (name: string) => void
   onUpdateBag: (bagId: number, data: PackingUpdateBagRequest) => void
   onDeleteBag: (bagId: number) => void
@@ -29,17 +31,20 @@ export interface MBagsSheetProps {
  * is the caller's business — this sheet just renders whatever bags it's given.
  */
 export default function MBagsSheet({
-  planner, open, onClose, bags, items, tripMembers, canEdit, onCreateBag, onUpdateBag, onDeleteBag, onSetBagMembers,
+  planner, open, onClose, bags, items, tripMembers, canEdit, currentUserId, onCreateBag, onUpdateBag, onDeleteBag, onSetBagMembers,
 }: MBagsSheetProps) {
   const { t } = planner
   const [addingBag, setAddingBag] = useState(false)
   const [newBagName, setNewBagName] = useState('')
 
-  const unassigned = items.filter(i => !i.bag_id)
+  // These numbers describe what you are carrying. An item someone shared with you stays
+  // in your list, but they are the one bringing it, so it is not your weight (#1767).
+  const myItems = items.filter(i => countsTowardsMyLoad(i, currentUserId))
+  const unassigned = myItems.filter(i => !i.bag_id)
   const unassignedWeight = unassigned.reduce((s, i) => s + packingItemWeight(i), 0)
-  const totalWeight = items.reduce((s, i) => s + packingItemWeight(i), 0)
+  const totalWeight = myItems.reduce((s, i) => s + packingItemWeight(i), 0)
   // Reference for bags without a limit of their own — computed once instead of per bag.
-  const heaviestBagWeight = Math.max(...bags.map(b => items.filter(i => i.bag_id === b.id).reduce((s, i) => s + packingItemWeight(i), 0)), 1)
+  const heaviestBagWeight = Math.max(...bags.map(b => myItems.filter(i => i.bag_id === b.id).reduce((s, i) => s + packingItemWeight(i), 0)), 1)
 
   const submitNewBag = () => {
     if (!newBagName.trim()) return
@@ -54,7 +59,7 @@ export default function MBagsSheet({
 
       <div className="min-h-0 flex-1 overflow-y-auto px-[18px] pb-[6px] pt-1">
         {bags.map(bag => {
-          const bagItems = items.filter(i => i.bag_id === bag.id)
+          const bagItems = myItems.filter(i => i.bag_id === bag.id)
           const bagWeight = bagItems.reduce((s, i) => s + packingItemWeight(i), 0)
           const pct = bagFillPct(bagWeight, bag.weight_limit_grams, heaviestBagWeight)
           return (

client/src/mobile/screens/trip/tabs/MPackingListTab.tsx

@@ -472,6 +472,7 @@ export default function MPackingListTab({ planner }: { planner: TripPlanner }) {
         items={items}
         tripMembers={tripMembers}
         canEdit={canEdit}
+        currentUserId={currentUserId}
         onCreateBag={createBag}
         onUpdateBag={updateBag}
         onDeleteBag={deleteBag}