feat: disabling auth submit on empty names

https://htmx.org/attributes/hx-validate/
for 'non form submittions' to trigger validation

custom check, because 'required' marks fields red immediately
and this js does only on attempted submittion,
not sure i want it, but seems better right now.
also - such a good argument for hyperscript

routes/static/out.css

@@ -612,3 +612,8 @@ video {
   font-size: 1.25rem;
   line-height: 1.75rem;
 }
+
+.invalid\:bg-red-700:invalid {
+  --tw-bg-opacity: 1;
+  background-color: rgb(185 28 28 / var(--tw-bg-opacity));
+}