{{/* present-controls — the command buttons, shared by the presenter
     view, the phone remote and the presenter's own fullscreen surface.

     Every button is its own <form method="post">, and that is the
     whole point: with scripts off the remote still drives the talk
     (spec §8), because a form and a redirect need nothing but a
     browser. static/present.js posts the same fields with fetch when
     it is there, so the two paths send identical requests and there is
     no second protocol to keep in step.

     The capability rides as a hidden field rather than living in the
     form's action: an action carrying a token would put it in the
     address bar of every page the redirect lands on.

     Keys (the whole `controls` struct, presentation.go):
       Action   string — /p/{session}/command
       Token    string — the remote capability
       Buttons  []{Op, Label, Slide} — one form each; Slide only for a
                goto, which nothing renders yet and which the handler
                accepts so a native remote has it. */}}
{{/* data-busy="false": the busy rule is for buttons that save something.
     Next, Previous and Blackout save nothing — they are presenting
     controls, and they stay instant (Paul, 2026-09-29). */}}
{{define "present-controls"}}
{{- range .Buttons}}
<form method="post" action="{{$.Action}}" data-busy="false">
  <input type="hidden" name="op" value="{{.Op}}">
  {{- if .Slide}}
  <input type="hidden" name="slide" value="{{.Slide}}">
  {{- end}}
  <input type="hidden" name="t" value="{{$.Token}}">
  <button rst-btn type="submit" slides-op="{{.Op}}">{{.Label}}</button>
</form>
{{- end}}
{{end}}