fix(jump-to-time): friendly message when homeserver lacks MSC3030

Jump to Time uses timestampToEvent (MSC3030). On a homeserver that doesn't
support it, the dialog showed the raw "M_UNRECOGNIZED: Unrecognized request"
error. Show a clear explanation instead when errcode is M_UNRECOGNIZED.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/app/features/room/jump-to-time/JumpToTime.tsx

@@ -234,7 +234,9 @@ export function JumpToTime({ onCancel, onSubmit }: JumpToTimeProps) {
               </Box>
               {timestampState.status === AsyncStatus.Error && (
                 <Text style={{ color: color.Critical.Main }} size="T300">
-                  {timestampState.error.message}
+                  {timestampState.error.errcode === 'M_UNRECOGNIZED'
+                    ? "Your homeserver doesn't support jumping to a date or time (MSC3030)."
+                    : timestampState.error.message}
                 </Text>
               )}
               <Button