Ask for shareWith, or the server does not send it

Nothing was ever badged as shared, "Stop sharing" never appeared, and the
share dialog opened on "not shared with anyone yet" over live shares. The
sharing itself was fine. The client simply never learned about it.

Stalwart does not return `shareWith` unless a client names it. A
`Calendar/get` or `AddressBook/get` with no `properties` comes back
without the field at all -- not null, not empty, absent -- confirmed
against the live 0.16.19 on a calendar and an address book that really
were shared with another account. Omit the list and there is no
`shareWith`; name it and the sharee is right there.

Both stores fetched everything by asking for nothing, and got less than
they would have by asking. They name the properties now.

The dialog is the part worth dwelling on. It seeds itself from the
`shareWith` it was handed, so it has been showing an empty sharee list on
collections that were shared -- the one screen whose whole job is
managing sharing, and the one most confidently wrong about it. Someone
looking there to see who had access, or to take it away, was told there
was nobody.

Files never had this: `fileNodeProps` has named the property since file
sharing went in, for the same reason and after the same surprise. The two
stores that fetched with `ids: null` and no properties are the two that
were blind.

The mock now omits it the same way. One that hands `shareWith` over
unasked lets a client that never asks look correct everywhere except
against a real server, which is exactly how this got here.

Verified against that mock: sharing a calendar puts the sharee in the
store, badges the row, adds "Stop sharing", and the dialog lists them --
while a `Calendar/get` with no properties still comes back without the
field, so the mock is now failing the way the server does.

server/src/mock/index.ts

@@ -379,6 +379,19 @@ function enforceLimits(name: string, args: Obj): void {
 
 const setResp = (extra: Obj = {}): Obj => ({ accountId: ACCOUNT, oldState: "1", newState: nextState(), created: {}, updated: {}, destroyed: [], ...extra });
 
+/*
+ * Stalwart does not return `shareWith` unless a client asks for it by name: a
+ * `/get` with no `properties` comes back without the field at all. Confirmed on
+ * 0.16.19 (2026-08-27) against a calendar and an address book that really were
+ * shared. The mock handing it over unasked meant a client that never asked
+ * still saw every share, and the one place that did not -- the real server --
+ * showed nothing shared at all.
+ */
+function hideShareWithUnlessAsked(a: Obj, res: { list: Obj[] }): { list: Obj[] } {
+  if (a.properties) return res;
+  return { ...res, list: res.list.map(({ shareWith: _drop, ...rest }) => rest) };
+}
+
 function genericGet(list: Obj[]) {
   return (a: Obj) => {
     const ids = a.ids as string[] | null | undefined;
@@ -759,7 +772,7 @@ const handlers: Record<string, Handler> = {
   "SieveScript/get": genericGet(sieveScripts),
   "SieveScript/set": (a) => { const r = genericSet(sieveScripts, "sv", (o) => Object.assign(o, { isActive: false, ...o }))(a); const act = (a.onSuccessActivateScript as string | undefined); if (act) { const id = act.startsWith("#") ? ((r.created as Obj)[act.slice(1)] as Obj)?.id : act; for (const s of sieveScripts) s.isActive = s.id === id; } if (a.onSuccessDeactivateScript) for (const s of sieveScripts) s.isActive = false; return r; },
   "SieveScript/validate": () => ({ accountId: ACCOUNT, error: null }),
-  "Calendar/get": (a) => genericGet(calendarsFor(a.accountId))(a),
+  "Calendar/get": (a) => hideShareWithUnlessAsked(a, genericGet(calendarsFor(a.accountId))(a) as { list: Obj[] }) as never,
   "Calendar/set": (a) => genericSet(calendarsFor(a.accountId), "c", (o) => Object.assign(o, { color: "#0f766e", isSubscribed: true, isVisible: true, isDefault: false, includeInAvailability: "all", timeZone: null, shareWith: null, myRights: rightsCal(), description: null, sortOrder: 0, ...o }))(a),
   "CalendarEvent/query": (a) => { const list = eventsFor(a.accountId); return { accountId: a.accountId ?? ACCOUNT, queryState: "1", canCalculateChanges: false, position: 0, ids: list.filter((e) => !(a.filter as Obj)?.uid || e.uid === (a.filter as Obj).uid).map((e) => e.id), total: list.length }; },
   "CalendarEvent/get": (a) => genericGet(eventsFor(a.accountId))(a),
@@ -778,7 +791,7 @@ const handlers: Record<string, Handler> = {
   "Principal/query": () => ({ accountId: ACCOUNT, queryState: "1", canCalculateChanges: false, position: 0, ids: principals.map((p) => p.id) }),
   "Principal/get": genericGet(principals),
   "Principal/getAvailability": (a) => ({ accountId: ACCOUNT, list: [{ utcStart: String(a.utcStart).slice(0, 11) + "13:00:00Z", utcEnd: String(a.utcStart).slice(0, 11) + "14:30:00Z", busyStatus: "confirmed", event: null }] }),
-  "AddressBook/get": (a) => genericGet(booksFor(a.accountId))(a),
+  "AddressBook/get": (a) => hideShareWithUnlessAsked(a, genericGet(booksFor(a.accountId))(a) as { list: Obj[] }) as never,
   "AddressBook/set": (a) => {
     /* Stalwart refuses any update to a book shared read-only, `isSubscribed`
        included -- "You are not allowed to modify this address book", confirmed