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/utils/kumaStatus.test.ts

@@ -1,7 +1,6 @@
 import { test } from 'node:test';
 import assert from 'node:assert/strict';
 import {
-  plain,
   DEFAULT_GROUPS,
   kumaBeatTime,
   kumaUrls,
@@ -261,27 +260,3 @@ test('a dismissed calls-down banner lets the next one through, never hides serve
     'server-down',
   );
 });
-
-test('plain: strips Markdown syntax only, keeps ordinary #, _, > and * (#308)', () => {
-  assert.equal(
-    plain('join #lotus-general or #announcements:lotusguild.org'),
-    'join #lotus-general or #announcements:lotusguild.org',
-  );
-  assert.equal(
-    plain('ping @some_user about snake_case and C#'),
-    'ping @some_user about snake_case and C#',
-  );
-  assert.equal(
-    plain('calls -> fixed, > 5 people, 5 * 3 = 15'),
-    'calls -> fixed, > 5 people, 5 * 3 = 15',
-  );
-  assert.equal(
-    plain('# Heading\n* item one\n- item two\n> quoted'),
-    'Heading\nitem one\nitem two\nquoted',
-  );
-  assert.equal(plain('**bold**, *em*, _em_, `/sfu/get`'), 'bold, em, em, /sfu/get');
-  assert.equal(
-    plain('Read the <b>guide</b> <img src=x onerror=alert(1)> [docs](https://x.y)'),
-    'Read the guide  docs',
-  );
-});

src/app/utils/kumaStatus.ts

@@ -240,25 +240,12 @@ const incidentTone = (style: string): BannerTone => {
 };
 
 /** Markdown-ish incident text as plain text for the Details line. */
-/**
- * [Gitea #308] Markdown → plain text for the Details line. Strips only the
- * syntax: removing every `*_\`#>` also broke "#lotus-general", "snake_case",
- * "->" and "5 * 3". HTML tags are dropped (React escapes the text anyway).
- */
-export const plain = (s: string): string =>
+const plain = (s: string): string =>
   s
     .replace(/!\[[^\]]*\]\([^)]*\)/g, '')
     .replace(/\[([^\]]+)\]\([^)]*\)/g, '$1')
-    .replace(/<\/?[a-z][^>]*>/gi, '')
-    .replace(/^[ \t]{0,3}#{1,6}[ \t]+/gm, '')
-    .replace(/^[ \t]*>[ \t]?/gm, '')
-    .replace(/^[ \t]*[*+-][ \t]+/gm, '')
-    .replace(/`([^`\n]+)`/g, '$1')
-    .replace(/\*\*(?=\S)([^*\n]*?\S)\*\*/g, '$1')
-    .replace(/__(?=\S)([^_\n]*?\S)__/g, '$1')
-    .replace(/(^|[^\w*])\*(?=\S)([^*\n]*?\S)\*(?![\w*])/g, '$1$2')
-    .replace(/(^|[^\w])_(?=\S)([^_\n]*?\S)_(?!\w)/g, '$1$2')
-    .replace(/[ \t]+\n/g, '\n')
+    .replace(/[*_`#>]/g, '')
+    .replace(/\s+\n/g, '\n')
     .trim();
 
 /**