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/sidebar/SpaceTabs.tsx

@@ -47,7 +47,13 @@ import {
 import { useMatrixClient } from '../../../hooks/useMatrixClient';
 import { roomToParentsAtom } from '../../../state/room/roomToParents';
 import { allRoomsAtom } from '../../../state/room-list/roomList';
-import { getSpaceLobbyPath, getSpacePath, joinPathComponent } from '../../pathUtils';
+import {
+  getOriginBaseUrl,
+  getSpaceLobbyPath,
+  getSpacePath,
+  joinPathComponent,
+} from '../../pathUtils';
+import { useClientConfig } from '../../../hooks/useClientConfig';
 import {
   SidebarAvatar,
   SidebarItem,
@@ -85,6 +91,7 @@ import { markAsRead } from '../../../utils/notifications';
 import { copyToClipboard } from '../../../utils/dom';
 import { stopPropagation } from '../../../utils/keyboard';
 import { getMatrixToRoom } from '../../../plugins/matrix-to';
+import { getLotusSpacePermalink } from '../../../plugins/lotus-permalink';
 import { getViaServers } from '../../../plugins/via-servers';
 import { getRoomAvatarUrl } from '../../../utils/room';
 import { useMediaAuthentication } from '../../../hooks/useMediaAuthentication';
@@ -103,6 +110,7 @@ type SpaceMenuProps = {
 const SpaceMenu = forwardRef<HTMLDivElement, SpaceMenuProps>(
   ({ room, requestClose, onUnpin }, ref) => {
     const mx = useMatrixClient();
+    const { hashRouter } = useClientConfig();
     const [hideActivity] = useSetting(settingsAtom, 'hideActivity');
     const roomToParents = useAtomValue(roomToParentsAtom);
     const powerLevels = usePowerLevels(room);
@@ -138,6 +146,16 @@ const SpaceMenu = forwardRef<HTMLDivElement, SpaceMenuProps>(
       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);
     };
@@ -209,6 +227,16 @@ const SpaceMenu = forwardRef<HTMLDivElement, SpaceMenuProps>(
               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"