Tell the page when the chat changes height

The Scheduler sizes the views above the panel from what the chat leaves, so a chat that resizes
silently grew off the bottom and took its own composer with it.

Plugin/unraid/include/ai_chat.php

@@ -365,6 +365,9 @@ vv_ai_profiles_script();
     // conversation, or the page retargeting. A page holding its own copy of "which profile" has
     // no other way to stay in step with a menu it does not own.
     const onProfile = o.onProfile || function () {};
+    // Called with the new state when the operator expands or collapses, for a page that has to
+    // re-lay itself out around the new height. See the grow handler.
+    const onResize = o.onResize || function () {};
     const store   = o.chats !== false;
     const POLL_MS = 1200;
     const POLL_CEIL = 300000;   // stop polling a worker that never wrote a terminal state
@@ -872,7 +875,20 @@ vv_ai_profiles_script();
       }
     }
     if (growBtn) {
-      growBtn.addEventListener('click', () => { big = !big; applyHeights(); scroll(); });
+      // onResize fires only here, on the operator's own toggle — never from setHeights(). A page
+      // whose layout depends on this height calls setHeights() from inside its fit routine, so
+      // announcing it there would call that routine from within itself, forever.
+      //
+      // A placement that is not simply taller than its neighbours has to be told. The Scheduler
+      // panel is pinned at the bottom and the views above it are sized from what is left, so
+      // without this the chat grows downward off the end of the panel and takes its own composer
+      // with it — which is precisely what it did.
+      growBtn.addEventListener('click', () => {
+        big = !big;
+        applyHeights();
+        scroll();
+        onResize(big);
+      });
     }
 
     // Surface any script error into the transcript. Without it a throw anywhere on the page is

Plugin/unraid/pages/scheduler.php

@@ -2400,6 +2400,9 @@ if (document.getElementById('vv-sched-ai-chat')) {
       return false;
     },
     onTurn:     () => { vvAiFixArm(); requestAnimationFrame(vvFitRight); },
+    // Expanding changes how much of the panel is left for the views above it. Without this the
+    // chat grows downward past the end of the panel instead of upward into it.
+    onResize:   () => requestAnimationFrame(vvFitRight),
     onOffer:    (kind, yes) => { if (kind === 'fix') vvAiFixAnswer(yes); },
   });
 }