fix(chat): show in-flight tools immediately and keep collapsed activity live (#563)

* fix(chat): render active tools before completion

* fix(chat): preserve running activity in collapsed view

* fix(chat): live-update duration for active tools

* fix: show live tool activity without timer resets

Show active tool rows before completion
Keep live duration stable during streaming updates

---------

Co-authored-by: Bohdan Triapitsyn <artmore@protonmail.com>

packages/ui/src/components/chat/message/parts/ProgressiveGroup.tsx

@@ -107,9 +107,36 @@ const ProgressiveGroup: React.FC<ProgressiveGroupProps> = ({
 
     const toolConnections = getToolConnections(displayParts);
 
-    // For collapsed state: show last N items
+    // For collapsed state: show last N items, but ensure at least one in-flight item is visible if exists
     const visibleCollapsedParts = React.useMemo(() => {
-        return displayParts.slice(-MAX_VISIBLE_COLLAPSED);
+        const defaultVisible = displayParts.slice(-MAX_VISIBLE_COLLAPSED);
+        
+        const hasVisibleActive = defaultVisible.some((p) => p.endedAt === undefined);
+        if (hasVisibleActive) {
+            return defaultVisible;
+        }
+
+        const activeParts = displayParts.filter((p) => p.endedAt === undefined);
+        if (activeParts.length === 0) {
+            return defaultVisible;
+        }
+
+        const newestActive = activeParts[activeParts.length - 1];
+        const visibleIds = new Set(defaultVisible.map((p) => p.id));
+        
+        if (visibleIds.has(newestActive.id)) {
+            return defaultVisible;
+        }
+
+        const replacementIndex = 0;
+        const result = [...defaultVisible];
+        result[replacementIndex] = newestActive;
+        
+        return result.sort((a, b) => {
+            const aIndex = displayParts.findIndex((p) => p.id === a.id);
+            const bIndex = displayParts.findIndex((p) => p.id === b.id);
+            return aIndex - bIndex;
+        });
     }, [displayParts]);
 
     // Set of part IDs that were visible in collapsed state