Add Shared Media drawer and harden same-room navigation.

Widen the media panel, support skinny full-page mode, keep jump-to-latest and return-to-previous reliable, and stop same-room event jumps from remounting the outlet or yanking the sidebar.

src/app/features/room/Room.tsx

@@ -3,9 +3,10 @@ import { Box, Line } from 'folds';
 import { decodeRouteParam } from '../../pages/pathUtils';
 import { useParams } from 'react-router-dom';
 import { isKeyHotkey } from 'is-hotkey';
-import { useSetAtom } from 'jotai';
+import { useAtom, useSetAtom } from 'jotai';
 import { RoomView } from './RoomView';
 import { MembersDrawer } from './MembersDrawer';
+import { MediaDrawer } from './room-media-menu';
 import { ScreenSize, useScreenSizeContext } from '../../hooks/useScreenSize';
 import { useSetting } from '../../state/hooks/settings';
 import { settingsAtom } from '../../state/settings';
@@ -16,6 +17,7 @@ import { useMarkAsRead } from '../../hooks/useMarkAsRead';
 import { useMatrixClient } from '../../hooks/useMatrixClient';
 import { useRoomMembers } from '../../hooks/useRoomMembers';
 import { activeRoomIdAtom } from '../../state/activeRoom';
+import { isMediaDrawerAtom } from '../../state/mediaDrawer';
 import { isForum } from '../../utils/room';
 import { ForumRoomView } from './ForumRoomView';
 
@@ -26,13 +28,18 @@ export function Room() {
   const mx = useMatrixClient();
   const setActiveRoomId = useSetAtom(activeRoomIdAtom);
 
-  const [isDrawer] = useSetting(settingsAtom, 'isPeopleDrawer');
+  const [isPeopleDrawer] = useSetting(settingsAtom, 'isPeopleDrawer');
+  const [isMediaDrawer] = useAtom(isMediaDrawerAtom);
   const [hideActivity] = useSetting(settingsAtom, 'hideActivity');
   const screenSize = useScreenSizeContext();
   const powerLevels = usePowerLevels(room);
   const members = useRoomMembers(mx, room.roomId);
   const markAsRead = useMarkAsRead(mx);
   const forumRoom = isForum(room);
+  const skinny = screenSize !== ScreenSize.Desktop;
+  const showMediaSolo = skinny && isMediaDrawer;
+  const showRightDrawer =
+    !skinny && (isPeopleDrawer || isMediaDrawer);
 
   // Update titlebar with current room ID
   useEffect(() => {
@@ -55,11 +62,21 @@ export function Room() {
   return (
     <PowerLevelsContextProvider value={powerLevels}>
       <Box grow="Yes">
-        {forumRoom ? <ForumRoomView room={room} eventId={eventId} /> : <RoomView room={room} eventId={eventId} />}
-        {screenSize === ScreenSize.Desktop && isDrawer && (
+        {!showMediaSolo &&
+          (forumRoom ? (
+            <ForumRoomView room={room} eventId={eventId} />
+          ) : (
+            <RoomView room={room} eventId={eventId} />
+          ))}
+        {showMediaSolo && <MediaDrawer room={room} solo />}
+        {!showMediaSolo && showRightDrawer && (
           <>
             <Line variant="Background" direction="Vertical" size="300" />
-            <MembersDrawer key={room.roomId} room={room} members={members} />
+            {isMediaDrawer ? (
+              <MediaDrawer room={room} />
+            ) : (
+              <MembersDrawer key={room.roomId} room={room} members={members} />
+            )}
           </>
         )}
       </Box>