feat(planner): scope the planned places filter to the selected day

With a day selected, the 'planned' filter now shows only that day's stops,
matching how the other filters follow the selection; with no day selected
it keeps showing the whole plan. 'unplanned' still uses the whole-trip
assigned set. Discussed in #2024.

client/src/pages/tripPlanner/useTripPlanner.test.tsx

@@ -680,6 +680,28 @@ describe('useTripPlanner — map derivations', () => {
     expect(result.current.mapPlaces.map(p => p.id)).toEqual([1])
   })
 
+  it('FE-TP-HOOK-111: the planned filter follows the selected day when one is selected', async () => {
+    const onDay7 = geo(1)
+    const onDay8 = geo(2)
+    seedTrip({
+      places: [onDay7, onDay8, geo(3)],
+      assignments: {
+        '7': [buildAssignment({ id: 10, day_id: 7, place: onDay7 })],
+        '8': [buildAssignment({ id: 11, day_id: 8, place: onDay8 })],
+      },
+      placesFilter: 'planned',
+      selectedDayId: 7,
+    })
+
+    const { result } = await renderPlanner()
+
+    expect(result.current.mapPlaces.map(p => p.id)).toEqual([1])
+
+    // No day selected → back to the whole plan
+    act(() => { useTripStore.setState({ selectedDayId: null }) })
+    expect(result.current.mapPlaces.map(p => p.id)).toEqual([1, 2])
+  })
+
   it('FE-TP-HOOK-030: collapsing a day hides its stops unless another expanded day shows them', async () => {
     const shared = geo(1)
     seedTrip({

client/src/pages/tripPlanner/useTripPlanner.ts

@@ -439,9 +439,15 @@ export function useTripPlanner() {
     }
 
     // Planned place IDs — needed by both the 'unplanned' filter (exclude them) and
-    // the new 'planned' filter (keep only them).
+    // the new 'planned' filter (keep only them). With a day selected, 'planned'
+    // follows it like the other filters do; with no day selected it keeps showing
+    // the whole plan (#2024). 'unplanned' always uses the whole-trip set — a place
+    // assigned to any day is not unplanned.
     const plannedIds = placesFilter === 'unplanned' || placesFilter === 'planned'
-      ? new Set(Object.values(assignments).flatMap(da => da.map(a => a.place?.id).filter(Boolean)))
+      ? new Set((placesFilter === 'planned' && selectedDayId
+        ? (assignments[String(selectedDayId)] || [])
+        : Object.values(assignments).flat()
+      ).map(a => a.place?.id).filter(Boolean))
       : null
 
     return places.filter(p => {
@@ -460,7 +466,7 @@ export function useTripPlanner() {
       if (placesFilter === 'planned' && plannedIds && !plannedIds.has(p.id)) return false
       return true
     })
-  }, [places, placesCategoryFilter, placesFilter, assignments, expandedDayIds])
+  }, [places, placesCategoryFilter, placesFilter, assignments, expandedDayIds, selectedDayId])
 
   const { route, routeSegments, routeVias, routeInfo, setRoute, setRouteInfo, updateRouteForDay } = useRouteCalculation({ assignments } as any, selectedDayId, routeShown, routeProfile, tripAccommodations)