Chat page on phones: one row is held for the voice channel list, so the chat below does not move down when the list lands (CLS 0.04 → 0.024) (#226)

ddiff --git a/public/css/features/chatpage.css b/public/css/features/chatpage.css
iindex 2367d049..4d1088be 100644
---- a/public/css/features/chatpage.css
++++ b/public/css/features/chatpage.css
@@@ -318,6 +318,9 @@
      .vc-sidebar-header {
          padding: 10px 12px 8px;
      }
++    /* The channel list (at least the Public room) fills in after the page: one row is held for it, so the chat below
++       it does not move down when it lands (a 46-58 px shift on phones, CLS 0.04). */
++    .vc-channel-list { min-height: 58px; }
      .vc-connected-header {
          padding: 8px 10px;
      }