Give the chat shortcuts worth listing, and a place to list them

Four new keys alongside Ctrl+Enter, rendered from the same list the handler reads so the panel
cannot advertise a key that stopped working.

Plugin/unraid/pages/scheduler.php

@@ -1224,7 +1224,7 @@ function vvFitRight() {
   // its floor, and nothing ever raised it again.
   const availH = Math.max(80, lf.getBoundingClientRect().top - 32
                             - toolbar.getBoundingClientRect().bottom);
-  // Three shares of the panel: 13% collapsed, 20% expanded at Medium, 40% at Large. Collapsed is
+  // Three shares of the panel: 10% collapsed, 20% expanded at Medium, 40% at Large. Collapsed is
   // deliberately small — enough to see the last exchange and type, while the log, conf or script
   // being discussed keeps the panel, which is what you are usually asking about. Medium is for
   // following an answer without giving up the view; Large is for sitting and reading one, and
@@ -1251,7 +1251,7 @@ function vvFitRight() {
     // discussed on screen too; a chat that covers it entirely is not worth the room it took.
     const VIEW_MIN = 90;
     const room = Math.max(60, availH - VIEW_MIN - chrome);
-    vvSchedChat.setHeights(Math.min(room, Math.max(60,  Math.round(availH * 0.13))) + 'px',
+    vvSchedChat.setHeights(Math.min(room, Math.max(52,  Math.round(availH * 0.10))) + 'px',
                            Math.min(room, Math.max(100, Math.round(availH * 0.20))) + 'px',
                            Math.min(room, Math.max(140, Math.round(availH * 0.40))) + 'px');
   }