feat(links): Copy Lotus Link permalinks, in-app recognition, /home redirect for joined rooms, via= alias, OIDC deep-link redirect (#130)

matrix.to cannot target this deployment (Cinny adapter hard-codes
app.cinny.in; web-instance[] is Element-only, allowlisted), so add a
"Copy Lotus Link" next to every Copy Link (message menu, space header
menu, sidebar space tab) producing https://<this origin>/home/<room>/<event>
?viaServers=… via plugins/lotus-permalink.ts. Lotus links in messages are
rewritten to their matrix.to form inside the HTML parser so they render as
room/event mentions and navigate in place.

/home/<room> for a joined room that belongs to a space or Direct now
redirects to its own route (was a preview card with a View button; also
the form matrix.to → Cinny links use). ?via= is accepted as an alias of
?viaServers= (what the matrix.to Cinny adapter emits). A deep link
visited while logged out is now honoured after an OIDC login: the OIDC
callback reloads at the app root, which discarded the stored path — the
index loader consumes it via the shared takeAfterLoginPath().

Verified end-to-end with Playwright on a local Synapse: logged-out cold
link → login → lands on the event under the space route; menu copies the
expected link; a pasted Lotus link renders as a mention and jumps in
place; both space menus copy the space link.

Closes #130

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PPmy3tPq869XDW4njjVaKA

src/app/pages/client/space/Space.tsx

@@ -39,7 +39,13 @@ import {
   NavItemContent,
   NavLink,
 } from '../../../components/nav';
-import { getSpaceLobbyPath, getSpaceRoomPath, getSpaceSearchPath } from '../../pathUtils';
+import {
+  getOriginBaseUrl,
+  getSpaceLobbyPath,
+  getSpaceRoomPath,
+  getSpaceSearchPath,
+} from '../../pathUtils';
+import { useClientConfig } from '../../../hooks/useClientConfig';
 import { getCanonicalAliasOrRoomId, isRoomAlias } from '../../../utils/matrix';
 import { useSelectedRoom } from '../../../hooks/router/useSelectedRoom';
 import {
@@ -70,6 +76,7 @@ import { useStateEvent } from '../../../hooks/useStateEvent';
 import { Membership, StateEvent } from '../../../../types/matrix/room';
 import { stopPropagation } from '../../../utils/keyboard';
 import { getMatrixToRoom } from '../../../plugins/matrix-to';
+import { getLotusSpacePermalink } from '../../../plugins/lotus-permalink';
 import { getViaServers } from '../../../plugins/via-servers';
 import { useSetting } from '../../../state/hooks/settings';
 import { settingsAtom } from '../../../state/settings';
@@ -93,6 +100,7 @@ type SpaceMenuProps = {
 };
 const SpaceMenu = forwardRef<HTMLDivElement, SpaceMenuProps>(({ room, requestClose }, ref) => {
   const mx = useMatrixClient();
+  const { hashRouter } = useClientConfig();
   const [hideActivity] = useSetting(settingsAtom, 'hideActivity');
   const [developerTools] = useSetting(settingsAtom, 'developerTools');
   const roomToParents = useAtomValue(roomToParentsAtom);
@@ -125,6 +133,16 @@ const SpaceMenu = forwardRef<HTMLDivElement, SpaceMenuProps>(({ room, requestClo
     requestClose();
   };
 
+  // [Gitea #130] direct link into this deployment
+  const handleCopyLotusLink = () => {
+    const roomIdOrAlias = getCanonicalAliasOrRoomId(mx, room.roomId);
+    const viaServers = isRoomAlias(roomIdOrAlias) ? undefined : getViaServers(room);
+    copyToClipboard(
+      getLotusSpacePermalink(getOriginBaseUrl(hashRouter), roomIdOrAlias, viaServers),
+    );
+    requestClose();
+  };
+
   const handleInvite = () => {
     setInvitePrompt(true);
   };
@@ -189,6 +207,16 @@ const SpaceMenu = forwardRef<HTMLDivElement, SpaceMenuProps>(({ room, requestClo
             Copy Link
           </Text>
         </MenuItem>
+        <MenuItem
+          onClick={handleCopyLotusLink}
+          size="300"
+          after={<Icon size="100" src={Icons.Link} />}
+          radii="300"
+        >
+          <Text style={{ flexGrow: 1 }} as="span" size="T300" truncate>
+            Copy Lotus Link
+          </Text>
+        </MenuItem>
         <MenuItem
           onClick={handleRoomSettings}
           size="300"