feat: users should be able to switch models mid-thread (#1226)

## Problem
Right now users have to start a new thread to use another model which causes a lot of confusion to our users.

fixes #1201

web/containers/DropdownListSidebar/index.tsx

@@ -72,16 +72,10 @@ export default function DropdownListSidebar() {
   if (!activeThread) {
     return null
   }
-  const finishInit = threadStates[activeThread.id].isFinishInit ?? true
 
   return (
-    <Tooltip>
-      <TooltipTrigger className="w-full">
-        <Select
-          disabled={finishInit}
-          value={selected?.id}
-          onValueChange={finishInit ? undefined : onValueSelected}
-        >
+    <>
+      <Select value={selected?.id} onValueChange={onValueSelected}>
         <SelectTrigger className="w-full">
           <SelectValue placeholder="Choose model to start">
             {downloadedModels.filter((x) => x.id === selected?.id)[0]?.name}
@@ -127,14 +121,6 @@ export default function DropdownListSidebar() {
           </div>
         </SelectContent>
       </Select>
-      </TooltipTrigger>
-
-      {finishInit && (
-        <TooltipContent sideOffset={10}>
-          <span>Start a new thread to change the model</span>
-          <TooltipArrow />
-        </TooltipContent>
-      )}
 
       {selected?.engine === InferenceEngine.openai && (
         <div className="mt-4">
@@ -154,6 +140,6 @@ export default function DropdownListSidebar() {
           />
         </div>
       )}
-    </Tooltip>
+    </>
   )
 }

web/hooks/useSendChatMessage.ts

@@ -138,7 +138,10 @@ export default function useSendChatMessage() {
     const activeThreadState = threadStates[activeThread.id]
 
     // if the thread is not initialized, we need to initialize it first
-    if (!activeThreadState.isFinishInit) {
+    if (
+      !activeThreadState.isFinishInit ||
+      activeThread.assistants[0].model.id !== selectedModel?.id
+    ) {
       if (!selectedModel) {
         toaster({ title: 'Please select a model' })
         return