feat: allow send image only

app/components/chat.tsx

@@ -115,11 +115,14 @@ import { getClientConfig } from "../config/client";
 import { useAllModels } from "../utils/hooks";
 import { MultimodalContent } from "../client/api";
 
-const localStorage = safeLocalStorage();
 import { ClientApi } from "../client/api";
 import { createTTSPlayer } from "../utils/audio";
 import { MsEdgeTTS, OUTPUT_FORMAT } from "../utils/ms_edge_tts";
 
+import { isEmpty } from "lodash-es";
+
+const localStorage = safeLocalStorage();
+
 const ttsPlayer = createTTSPlayer();
 
 const Markdown = dynamic(async () => (await import("./markdown")).Markdown, {
@@ -1015,7 +1018,7 @@ function _Chat() {
   };
 
   const doSubmit = (userInput: string) => {
-    if (userInput.trim() === "") return;
+    if (userInput.trim() === "" && isEmpty(attachImages)) return;
     const matchCommand = chatCommands.match(userInput);
     if (matchCommand.matched) {
       setUserInput("");

app/store/chat.ts

@@ -337,22 +337,16 @@ export const useChatStore = createPersistStore(
 
         if (attachImages && attachImages.length > 0) {
           mContent = [
-            {
-              type: "text",
-              text: userContent,
-            },
+            ...(userContent
+              ? [{ type: "text" as const, text: userContent }]
+              : []),
+            ...attachImages.map((url) => ({
+              type: "image_url" as const,
+              image_url: { url },
+            })),
           ];
-          mContent = mContent.concat(
-            attachImages.map((url) => {
-              return {
-                type: "image_url",
-                image_url: {
-                  url: url,
-                },
-              };
-            }),
-          );
         }
+
         let userMessage: ChatMessage = createMessage({
           role: "user",
           content: mContent,