[Chat input] Blur on submit (#790)

* [Chat input] Blur on submit

* nuance

* extra comment

* focus only on desktop

src/lib/components/chat/ChatInput.svelte

@@ -22,6 +22,12 @@
 		// submit on enter
 		if (event.key === "Enter" && !event.shiftKey && !isCompositionOn) {
 			event.preventDefault();
+			// blur to close keyboard on mobile
+			textareaElement.blur();
+			// refocus so that user on desktop can start typing without needing to reclick on textarea
+			if (innerWidth > TABLET_VIEWPORT_WIDTH) {
+				textareaElement.focus();
+			}
 			dispatch("submit"); // use a custom event instead of `event.target.form.requestSubmit()` as it does not work on Safari 14
 		}
 	}