Separate whether the chat is expanded from how big expanded is

One is an action taken constantly and the other a preference set once, so the banner names the
size and the composer keeps the toggle.

Plugin/unraid/pages/scheduler.php

@@ -1224,10 +1224,11 @@ function vvFitRight() {
   // its floor, and nothing ever raised it again.
   const availH = Math.max(80, lf.getBoundingClientRect().top - 32
                             - toolbar.getBoundingClientRect().bottom);
-  // A fifth of the panel at rest, two fifths expanded. Both were double this, which made the
-  // assistant the largest thing in the panel before it had been asked anything — and the view
-  // above is what the question is usually about. Expanded still leaves the majority to the log,
-  // conf or script being discussed, so a follow-up does not need the panel handed back first.
+  // Three shares of the panel: 13% 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
+  // still leaves the majority above it so a follow-up does not need the panel handed back first.
   //
   // It grows upward: the panel is pinned at the bottom and everything above it is sized from what
   // is left, a few lines down. So the top edge rises and the thing being read stays where it is.
@@ -1250,7 +1251,8 @@ 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(70,  Math.round(availH * 0.20))) + 'px',
+    vvSchedChat.setHeights(Math.min(room, Math.max(60,  Math.round(availH * 0.13))) + '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');
   }
   // Measured after the heights are applied, so this reads the clamped height, not the natural one.