Add a shared calendar or address book, rather than being given it

An account linked for its files also offered its calendar and its address
book, and neither had been shared. That was not ihasmail inventing them:
asked about the other account, the live 0.16.19 returns every calendar
and every book it holds, each with full rights -- read, write, share,
delete, all true. There is nothing in the rights to tell "shared with me"
from "reachable at all", because the server does not distinguish them.

`isSubscribed` does, and it is the field JMAP has for exactly this: it
came back false on all of them. So a shared calendar or book is listed
under "Shared with me" once the reader has added it, and under "Available
to add" until then, with one button either way.

Nothing unsubscribed contributes anything. A calendar that has not been
added draws no events, and a book that has not been added lends no cards
to the To field -- which is the one that mattered most, since it is the
difference between offering a colleague's contacts and offering a
stranger's without anyone having asked.

The mock's shared calendar and address book now arrive unsubscribed, the
way the real server hands them over, so the adding is exercised rather
than skipped; and its `Calendar/set` and `AddressBook/set` route by
account, since subscribing to somebody else's is a write to their
account and the mock had nowhere to put it.

Verified against the mock: the shared calendar sits under "Available to
add" with no events in the grid, adding it moves it to "Shared with me"
and its events appear, removing it undoes both; and `suggest("katherine")`
finds nothing until the shared book is added, then finds her.

server/src/mock/index.ts

@@ -181,7 +181,7 @@ let vacation: Obj = { id: "singleton", isEnabled: false, fromDate: null, toDate:
 const sieveScripts: Obj[] = [];
 /* A calendar in the shared account, so "Shared with me" and a colleague's
    events appearing in the grid can be exercised. Read-only, as a share is. */
-const sharedCalendars: Obj[] = [{ id: "c9", name: "Grace — Work", description: null, color: "#c084fc", sortOrder: 0, isSubscribed: true, isVisible: true, isDefault: true, includeInAvailability: "all", defaultAlertsWithTime: null, defaultAlertsWithoutTime: null, timeZone: "UTC", shareWith: {}, myRights: { mayReadFreeBusy: true, mayReadItems: true, mayWriteAll: false, mayWriteOwn: false, mayUpdatePrivate: false, mayRSVP: false, mayShare: false, mayDelete: false } }];
+const sharedCalendars: Obj[] = [{ id: "c9", name: "Grace — Work", description: null, color: "#c084fc", sortOrder: 0, isSubscribed: false, isVisible: true, isDefault: true, includeInAvailability: "all", defaultAlertsWithTime: null, defaultAlertsWithoutTime: null, timeZone: "UTC", shareWith: {}, myRights: { mayReadFreeBusy: true, mayReadItems: true, mayWriteAll: false, mayWriteOwn: false, mayUpdatePrivate: false, mayRSVP: false, mayShare: false, mayDelete: false } }];
 const sharedEvents: Obj[] = [];
 const eventsFor = (accountId: unknown): Obj[] => (accountId === SHARED_ACCOUNT ? sharedEvents : events);
 const calendarsFor = (accountId: unknown): Obj[] => (accountId === SHARED_ACCOUNT ? sharedCalendars : calendars);
@@ -207,7 +207,7 @@ const addressBooks: Obj[] = [{ id: "ab1", name: "Personal", description: null, s
 /* A book in the shared account, so "Shared with me" and addressing a message
    from somebody else's contacts can be exercised at all. Read-only, which is
    what a share usually is. */
-const sharedAddressBooks: Obj[] = [{ id: "ab9", name: "Team contacts", description: null, sortOrder: 0, isDefault: true, isSubscribed: true, shareWith: {}, myRights: abRights(false) }];
+const sharedAddressBooks: Obj[] = [{ id: "ab9", name: "Team contacts", description: null, sortOrder: 0, isDefault: true, isSubscribed: false, shareWith: {}, myRights: abRights(false) }];
 const sharedCards: Obj[] = [
   { id: "sc1", addressBookIds: { ab9: true }, name: { full: "Katherine Johnson" }, emails: { e1: { address: "[email protected]", contexts: {} } }, phones: {}, organizations: {}, nicknames: {}, addresses: {}, notes: {}, updated: new Date().toISOString() },
   { id: "sc2", addressBookIds: { ab9: true }, name: { full: "Dorothy Vaughan" }, emails: { e1: { address: "[email protected]", contexts: {} } }, phones: {}, organizations: {}, nicknames: {}, addresses: {}, notes: {}, updated: new Date().toISOString() },
@@ -732,7 +732,7 @@ const handlers: Record<string, Handler> = {
   "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/set": genericSet(calendars, "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 })),
+  "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),
   // Stalwart 0.16 rejects the RFC 8984 array outright and silently discards
@@ -751,7 +751,7 @@ const handlers: Record<string, Handler> = {
   "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/set": genericSet(addressBooks, "ab", (o) => Object.assign(o, { description: null, sortOrder: 0, isDefault: false, isSubscribed: true, shareWith: null, myRights: { mayRead: true, mayWrite: true, mayShare: true, mayDelete: true }, ...o })),
+  "AddressBook/set": (a) => genericSet(booksFor(a.accountId), "ab", (o) => Object.assign(o, { description: null, sortOrder: 0, isDefault: false, isSubscribed: true, shareWith: {}, myRights: abRights(), ...o }))(a),
   "ContactCard/query": (a) => { const list = a.accountId === SHARED_ACCOUNT ? sharedCards : cards; return { accountId: a.accountId ?? ACCOUNT, queryState: "1", canCalculateChanges: false, position: 0, ids: list.map((c) => c.id), total: list.length }; },
   "ContactCard/get": (a) => genericGet(a.accountId === SHARED_ACCOUNT ? sharedCards : cards)(a),
   "ContactCard/set": genericSet(cards, "cc"),