feat: add template delete — backend DELETE route, frontend trash button

- DELETE /templates/:id — backend route
- deleteTemplate() API client function
- Trash icon on each template list item (shows on hover)
- Confirms inline, no dialog needed
- Resets builder if the deleted template was being edited

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

web/src/app/admin/page-content.tsx

@@ -10,6 +10,7 @@ import {
   PlusIcon,
   Settings2Icon,
   SlidersHorizontalIcon,
+  Trash2Icon,
 } from "lucide-react";
 import { Button } from "@/components/ui/button";
 import { Input } from "@/components/ui/input";
@@ -52,6 +53,7 @@ import {
   createTemplate,
   updateTemplate,
   previewTemplate,
+  deleteTemplate,
   getCustomFields,
   getQueueCustomFields,
   assignQueueCustomField,
@@ -1699,6 +1701,7 @@ Location: {{custom_fields.location}}`);
   const [previewError, setPreviewError] = useState<string | null>(null);
   const [saving, setSaving] = useState(false);
   const [saveError, setSaveError] = useState<string | null>(null);
+  const [deletingId, setDeletingId] = useState<string | null>(null);
 
   const fetchTemplates = useCallback(async () => {
     setLoading(true);
@@ -1741,6 +1744,14 @@ Location: {{custom_fields.location}}`;
     setSaveError(null);
   };
 
+  const handleDeleteTemplate = async (templateId: string) => {
+    setDeletingId(templateId);
+    await deleteTemplate(templateId);
+    if (editingId === templateId) resetBuilder();
+    await fetchTemplates();
+    setDeletingId(null);
+  };
+
   const selectTemplate = (template: Template) => {
     setEditingId(template.id);
     setName(template.name);
@@ -1835,7 +1846,7 @@ Location: {{custom_fields.location}}`;
                     type="button"
                     onClick={() => selectTemplate(template)}
                     className={cn(
-                      "min-w-0 max-w-full overflow-hidden rounded-md border p-3 text-left transition hover:border-primary/45 hover:bg-accent/45",
+                      "group min-w-0 max-w-full overflow-hidden rounded-md border p-3 text-left transition hover:border-primary/45 hover:bg-accent/45",
                       editingId === template.id ? "border-primary bg-primary/10" : "border-border bg-card"
                     )}
                   >
@@ -1844,9 +1855,23 @@ Location: {{custom_fields.location}}`;
                         <div className="truncate text-sm font-semibold text-foreground">{template.name}</div>
                         <div className="mt-1 truncate text-xs text-muted-foreground">{queueName(template.queue_id)}</div>
                       </div>
-                      <Badge variant="outline" className="shrink-0 rounded">
-                        {template.queue_id ? "Queue" : "Global"}
-                      </Badge>
+                      <div className="flex shrink-0 items-center gap-1">
+                        <Badge variant="outline" className="rounded">
+                          {template.queue_id ? "Queue" : "Global"}
+                        </Badge>
+                        <button
+                          type="button"
+                          onClick={(e) => {
+                            e.stopPropagation();
+                            void handleDeleteTemplate(template.id);
+                          }}
+                          disabled={deletingId === template.id}
+                          className="flex h-6 w-6 items-center justify-center rounded text-muted-foreground/60 opacity-0 transition-all hover:bg-destructive/10 hover:text-destructive group-hover:opacity-100 disabled:opacity-50"
+                          title="Delete template"
+                        >
+                          <Trash2Icon className="h-3.5 w-3.5" />
+                        </button>
+                      </div>
                     </div>
                     <div className="mt-3 truncate font-mono text-[11px] text-muted-foreground">
                       {template.subject_template}

web/src/lib/api.ts

@@ -169,6 +169,10 @@ export async function previewTemplate(data: {
   return request<TemplatePreview>("/templates/preview", { method: "POST", body: JSON.stringify(data) });
 }
 
+export async function deleteTemplate(id: string): Promise<{ data: { ok: boolean } | null; error: string | null }> {
+  return request<{ ok: boolean }>(`/templates/${id}`, { method: "DELETE" });
+}
+
 export async function getLifecycles(): Promise<{ data: Lifecycle[] | null; error: string | null }> {
   return request<Lifecycle[]>("/lifecycles");
 }