Fix black chat pane and restore jumbo emoji rendering.

Column flex on keep-alive room hosts so the timeline fills the pane again, and route unicode jumbo through the plain emoji path with dedicated HTML parser options for custom emoticons.

src/app/pages/client/home/HomeLayout.tsx

@@ -34,6 +34,7 @@ export function HomeLayout() {
         minHeight: 0,
         position: 'relative',
         display: 'flex',
+        flexDirection: 'column',
       }}
     >
       {keepHost && (
@@ -43,6 +44,7 @@ export function HomeLayout() {
             minWidth: 0,
             minHeight: 0,
             display: showingRoom ? 'flex' : 'none',
+            flexDirection: 'column',
             position: 'relative',
           }}
           aria-hidden={!showingRoom}
@@ -56,6 +58,7 @@ export function HomeLayout() {
           minWidth: 0,
           minHeight: 0,
           display: showingRoom ? 'none' : 'flex',
+          flexDirection: 'column',
           position: 'relative',
         }}
       >