Include slot claimers in the Going list

The Going section now shows both RSVPs and people who claimed slots,
deduplicated by name (case-insensitive). Claim-only people don't get a
remove button—they unclaim from the slot card instead.

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

templates/slots.html

@@ -32,17 +32,19 @@
 {{end}}
 </div>
 
-<div class="section-label">Going ({{len .Rsvps}})</div>
+<div class="section-label">Going ({{.TotalGoing}})</div>
 <div class="rsvp-list">
-  {{if .Rsvps}}
-    {{range .Rsvps}}
+  {{if .GoingList}}
+    {{range .GoingList}}
     <span class="claim-chip">
       {{.Name}}{{if .Note}} <small style="color:#888">({{.Note}})</small>{{end}}
-      <button hx-delete="/e/{{$.Event.Slug}}/rsvp/{{.ID}}"
+      {{if gt .RsvpID 0}}
+      <button hx-delete="/e/{{$.Event.Slug}}/rsvp/{{.RsvpID}}"
               hx-target="#slots-container"
               hx-swap="innerHTML settle:0.1s"
               hx-confirm="Remove {{.Name}}?"
               title="Remove">&#215;</button>
+      {{end}}
     </span>
     {{end}}
   {{else}}