fix(leads): keep a future follow-up as an activity on the lead

A scheduled follow-up only stored a date, and activities opened from a lead were not linked back, so they disappeared from the lead.

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/web/src/views/ActivityFormView.vue

@@ -126,6 +126,7 @@ const dueDate = ref('');
 const dueTime = ref('10:30');
 const durationMinutes = ref(30);
 const personId = ref('');
+const leadId = ref('');
 const dealId = ref('');
 const assigneeIds = ref<string[]>([]);
 const isDone = ref(false);
@@ -519,6 +520,7 @@ async function load() {
       if (data.person?.id) await ensurePersonLoaded(data.person.id);
       personId.value = data.person?.id ?? '';
       dealId.value = data.deal?.id ?? '';
+      leadId.value = data.lead?.id ?? '';
       assigneeIds.value = data.assignees?.length
         ? data.assignees.map((a) => a.id)
         : data.assignee?.id
@@ -538,6 +540,7 @@ async function load() {
         await ensurePersonLoaded(incomingPerson);
         personId.value = incomingPerson;
       }
+      leadId.value = typeof route.query.leadId === 'string' ? route.query.leadId : '';
       const incomingDef =
         typeof route.query.typeDefId === 'string'
           ? activityTypes.byId.value.get(route.query.typeDefId)
@@ -599,6 +602,7 @@ function payload(): CreateActivityRequest {
     personId: personId.value || null,
     companyId: selectedPerson.value?.company?.id ?? null,
     dealId: dealId.value || null,
+    leadId: leadId.value || null,
     assigneeIds: [...assigneeIds.value],
     assigneeId: assigneeIds.value[0] || null,
   };