✨ feat: Add Google Parameters, Ollama/Openrouter Reasoning, & UI Optimizations (#5456)

* feat: Google Model Parameters

* fix: dynamic input number value, previously coerced by zod schema

* refactor: support openrouter reasoning tokens and XML for thinking directive to conform to ollama

* fix: virtualize combobox to prevent performance drop on re-renders of long model/agent/assistant lists

* refactor: simplify Fork component by removing unnecessary chat context index

* fix: prevent rendering of Thinking component when children are null

* refactor: update Markdown component to replace <think> tags and simplify remarkPlugins configuration

* refactor: reorder remarkPlugins to improve plugin configuration in Markdown component

client/src/components/Artifacts/Thinking.tsx

@@ -16,6 +16,10 @@ const Thinking = ({ children }: ThinkingProps) => {
     setIsExpanded(!isExpanded);
   };
 
+  if (children == null) {
+    return null;
+  }
+
   return (
     <div className="mb-3">
       <button