fix(share): room share and invite links open Lotus Chat, not matrix.to (#285)

matrix.to can't send anyone to this deployment (its Cinny adapter is
app.cinny.in, web-instance[] is Element-only), so a friend scanning a
room QR or clicking an invite link was offered Element or app.cinny.in.
Share Room (link + QR) and the Invite dialog (link + QR) now use the
Lotus permalink (correct on desktop via webAppUrl). The space menus
keep both "Copy Link" (matrix.to, for other clients) and "Copy Lotus Link".

Fixes #285

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017PCb59uY3UKqDqt7B6hzd5

src/app/components/invite-user-prompt/InviteUserPrompt.tsx

@@ -51,9 +51,10 @@ import { useMatrixClient } from '../../hooks/useMatrixClient';
 import { BreakWord } from '../../styles/Text.css';
 import { useAlive } from '../../hooks/useAlive';
 import { copyToClipboard } from '../../utils/dom';
-import { getMatrixToRoom } from '../../plugins/matrix-to';
 import { getViaServers } from '../../plugins/via-servers';
 import { useModalStyle } from '../../hooks/useModalStyle';
+import { useLotusShareBase } from '../../hooks/useLotusLinkBase';
+import { getLotusRoomPermalink, getLotusSpacePermalink } from '../../plugins/lotus-permalink';
 
 const SEARCH_OPTIONS: UseAsyncSearchOptions = {
   limit: 1000,
@@ -75,10 +76,14 @@ export function InviteUserPrompt({ room, requestClose }: InviteUserProps) {
   const [linkCopied, setLinkCopied] = useState(false);
   const [showQr, setShowQr] = useState(false);
 
+  // [Gitea #285] A link into this deployment; matrix.to can't open Lotus Chat.
+  const lotusBase = useLotusShareBase();
   const inviteUrl = (() => {
     const roomIdOrAlias = getCanonicalAliasOrRoomId(mx, room.roomId);
     const viaServers = isRoomAlias(roomIdOrAlias) ? undefined : getViaServers(room);
-    return getMatrixToRoom(roomIdOrAlias, viaServers);
+    return room.isSpaceRoom()
+      ? getLotusSpacePermalink(lotusBase, roomIdOrAlias, viaServers)
+      : getLotusRoomPermalink(lotusBase, roomIdOrAlias, undefined, viaServers);
   })();
 
   const handleCopyLink = () => {

src/app/hooks/useCallRejoin.ts

@@ -17,8 +17,6 @@ import {
   CALL_SESSION_HEARTBEAT_MS,
   clearCallSession,
   decideRejoin,
-  othersInCall,
-  rejoinToastBody,
   readCallSession,
   writeCallSession,
 } from '../utils/callRejoin';
@@ -114,27 +112,6 @@ export function useCallRejoin(embed: CallEmbed | undefined, joined: boolean): vo
       };
       dismissToast(TOAST_ID);
       clearCallSession();
-      // [Gitea #302] A DM call the other person has since left is over;
-      // starting it again would ring them, so just say so.
-      const dm = l.directs.has(room.roomId);
-      if (
-        dm &&
-        !othersInCall(
-          session.memberships.map((m) => m.userId ?? ''),
-          mx.getUserId() ?? '',
-        )
-      ) {
-        // Own id: clicking a toast removes it by id after its onClick runs.
-        setToast({
-          id: `${TOAST_ID}-ended`,
-          iconSrc: Icons.Phone,
-          displayName: 'Call ended',
-          body: `${room.name ?? 'They'} already left the call.`,
-          roomName: room.name ?? '',
-          roomId: room.roomId,
-        });
-        return;
-      }
       try {
         (l.directs.has(room.roomId) ? l.startDmCall : l.startRoomCall)(room, pref);
       } catch {
@@ -156,7 +133,6 @@ export function useCallRejoin(embed: CallEmbed | undefined, joined: boolean): vo
           .filter((m) => m.userId === mx.getUserId())
           .map((m) => m.deviceId),
         memberCount: memberships.length,
-        dm: latest.current.directs.has(room.roomId),
       });
       // The RTC session fills in a moment after sync; keep waiting while it is
       // empty unless this is the final (timed-out) look.
@@ -176,7 +152,7 @@ export function useCallRejoin(embed: CallEmbed | undefined, joined: boolean): vo
         id: TOAST_ID,
         iconSrc: Icons.Phone,
         displayName: 'Rejoin voice?',
-        body: rejoinToastBody(room.name, latest.current.directs.has(room.roomId)),
+        body: `You were in the call in ${room.name ?? 'a room'} before the restart. Tap to rejoin.`,
         roomName: room.name ?? '',
         roomId: room.roomId,
         sticky: true,

src/app/utils/callRejoin.test.ts

@@ -1,12 +1,6 @@
 import { describe, it } from 'node:test';
 import assert from 'node:assert/strict';
-import {
-  CALL_REJOIN_MAX_AGE_MS,
-  decideRejoin,
-  othersInCall,
-  rejoinToastBody,
-  RejoinContext,
-} from './callRejoin';
+import { CALL_REJOIN_MAX_AGE_MS, decideRejoin, RejoinContext } from './callRejoin';
 
 const base: RejoinContext = {
   record: {
@@ -60,21 +54,3 @@ describe('decideRejoin', () => {
     });
   });
 });
-
-it('decideRejoin: DM calls are never auto-rejoined, only offered (#302)', () => {
-  assert.deepEqual(decideRejoin({ ...base, mode: 'auto', dm: true }), {
-    action: 'ask',
-    roomId: '!r',
-  });
-  assert.deepEqual(decideRejoin({ ...base, mode: 'auto' }), { action: 'auto', roomId: '!r' });
-});
-
-it('rejoinToastBody and othersInCall (#302)', () => {
-  assert.equal(
-    rejoinToastBody('Bob Builder', true),
-    'You were in a call with Bob Builder before the restart. Tap to rejoin.',
-  );
-  assert.match(rejoinToastBody('Voice Lounge', false), /in the call in Voice Lounge/);
-  assert.equal(othersInCall(['@me:x'], '@me:x'), false);
-  assert.equal(othersInCall(['@me:x', '@bob:x'], '@me:x'), true);
-});

src/app/utils/callRejoin.ts

@@ -67,8 +67,6 @@ export type RejoinContext = {
   ownMemberDevices: string[];
   /** Number of call memberships in the room, ours included. */
   memberCount: number;
-  /** A DM call: rejoining one may ring the other person. */
-  dm?: boolean;
 };
 
 export type RejoinDecision = { action: 'none' } | { action: 'ask' | 'auto'; roomId: string };
@@ -85,18 +83,5 @@ export function decideRejoin(ctx: RejoinContext): RejoinDecision {
   // Nobody there any more (our own stale membership doesn't count).
   const others = ctx.memberCount - ctx.ownMemberDevices.length;
   if (others <= 0) return { action: 'none' };
-  // [Gitea #302] Never rejoin a DM call on our own: if the other person has
-  // just left, starting it again would ring them. Ask instead.
-  if (ctx.dm && mode === 'auto') return { action: 'ask', roomId: record.roomId };
   return { action: mode, roomId: record.roomId };
 }
-
-/** Pure: whether anyone but us is still in the call (by call membership). */
-export const othersInCall = (memberUserIds: string[], myUserId: string): boolean =>
-  memberUserIds.some((u) => u !== myUserId);
-
-/** The rejoin toast's text; DMs name the person rather than "the call in <room>". */
-export const rejoinToastBody = (roomName: string | undefined, dm: boolean): string =>
-  dm
-    ? `You were in a call with ${roomName ?? 'them'} before the restart. Tap to rejoin.`
-    : `You were in the call in ${roomName ?? 'a room'} before the restart. Tap to rejoin.`;