Fix autofocus on dynamically inserted forms, remove this.blur() handlers

form_controller.connect() now blurs the previously focused element and
explicitly focuses the [autofocus] element when a form is inserted into
the DOM (via Turbo Stream). Only runs when an [autofocus] element is
present, so closing forms and other stream updates are unaffected.

Remove all onclick='this.blur()' inline handlers from templates — they
were a workaround for the same autofocus problem, now solved properly
via the Stimulus lifecycle.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/views/measurements/_readout.html.erb

@@ -4,7 +4,7 @@
   <td>
     <% if current_user.at_least(:active) %>
       <%= link_to readout.quantity, edit_measurement_path(readout),
-        class: 'link', onclick: 'this.blur();', data: {turbo_stream: true} %>
+        class: 'link', data: {turbo_stream: true} %>
     <% else %>
       <%= readout.quantity %>
     <% end %>