fix: Add missing validation logic updates

Updates the chat form and store to allow sending messages that consist of only attachments without requiring any text content. This prevents the form from being blocked when users only want to send files.

Author: allozaur

tools/server/webui/src/lib/components/app/chat/ChatForm/ChatForm.svelte

@@ -54,7 +54,7 @@
 		if (event.key === 'Enter' && !event.shiftKey) {
 			event.preventDefault();
 
-			if (!message.trim() || disabled || isLoading) return;
+			if ((!message.trim() && uploadedFiles.length === 0) || disabled || isLoading) return;
 
 			const messageToSend = message.trim();
 			const filesToSend = [...uploadedFiles];
@@ -114,7 +114,7 @@
 
 	async function handleSubmit(event: SubmitEvent) {
 		event.preventDefault();
-		if (!message.trim() || disabled || isLoading) return;
+		if ((!message.trim() && uploadedFiles.length === 0) || disabled || isLoading) return;
 
 		const messageToSend = message.trim();
 		const filesToSend = [...uploadedFiles];

tools/server/webui/src/lib/stores/chat.svelte.ts

@@ -238,7 +238,7 @@ class ChatStore {
 	}
 
 	async sendMessage(content: string, extras?: DatabaseMessageExtra[]): Promise<void> {
-		if (!content.trim() || this.isLoading) return;
+		if ((!content.trim() && (!extras || extras.length === 0)) || this.isLoading) return;
 
 		let isNewConversation = false;