feat(chat): auto-detect text direction for RTL languages (#729)

Add dir="auto" to chat message content and composer textarea so
Persian and Arabic text automatically renders right-to-left
while English and other LTR text remains unaffected.

Co-authored-by: Haile <118998054+blackmammoth@users.noreply.github.com>

src/components/chat/view/subcomponents/ChatComposer.tsx

@@ -295,6 +295,7 @@ export default function ChatComposer({
 
             <PromptInputTextarea
               ref={textareaRef}
+              dir="auto"
               value={input}
               onChange={onInputChange}
               onClick={onTextareaClick}