Re-fit once the chat height has finished moving

The transcript animates, so a page measuring it one frame later sized itself from a box caught
mid-collapse and left a dead strip the height the chat was shrinking from.

Plugin/unraid/include/ai_chat.php

@@ -956,12 +956,31 @@ vv_ai_profiles_script();
     // 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.
-    function toggleBig() { big = !big; applyHeights(); scroll(); onResize(big); }
+    // Announced twice: now, so a page that lays out around this tracks the change as it happens,
+    // and again once it has finished.
+    //
+    // The transcript animates its height — see the transition on .vv-ai-chat — so a page that
+    // measures the moment we change it reads a box that is still moving. The Scheduler sizes the
+    // view above from the panel's measured height, and re-measuring one frame after a collapse
+    // read a dock caught part of the way down: the view came out short by roughly the height the
+    // chat was shrinking from, leaving a dead strip under the content that nothing filled. It only
+    // ever showed on collapse, because on expand the same error sizes the view too large and flex
+    // quietly shrinks it back.
+    let settle = null;
+    function announceResize() {
+      onResize(big);
+      clearTimeout(settle);
+      // Comfortably past the 140ms transition. A timer rather than transitionend, which does not
+      // fire at all when the computed height happens not to change.
+      settle = setTimeout(() => onResize(big), 220);
+    }
+
+    function toggleBig() { big = !big; applyHeights(); scroll(); announceResize(); }
     // Only meaningful while expanded, and the button is only reachable then. The shortcut has to
     // check for itself rather than silently changing a size nobody can see.
     function toggleSize() {
       if (!big) return;
-      large = !large; applyHeights(); scroll(); onResize(big);
+      large = !large; applyHeights(); scroll(); announceResize();
     }
 
     if (growBtn) growBtn.addEventListener('click', toggleBig);
@@ -990,8 +1009,10 @@ vv_ai_profiles_script();
         applyKeys(open);
         scroll();
         // The total is meant to hold, but the floor above can break that on a small placement, so
-        // the page is told either way rather than being left to find out by clipping.
-        onResize(big);
+        // the page is told either way rather than being left to find out by clipping. Through the
+        // same settle as the size controls: the list appears at once but the transcript animates
+        // to its new height, so an immediate measurement is of a box still moving.
+        announceResize();
       });
     }
 
@@ -1121,6 +1142,8 @@ vv_ai_profiles_script();
       },
       teardown() {
         clearInterval(pendingTimer);
+        // Would otherwise fire a re-layout at a page whose instance no longer exists.
+        clearTimeout(settle);
         window.removeEventListener('error', onErr);
         window.removeEventListener('unhandledrejection', onRej);
         document.removeEventListener('click', onDocClick);